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Jan Mertens
Institute of Plant Production
and Agroecology in the Tropics
and Subtropics, University of
Hohenheim – Stuttgart (Baden-
Württemberg), Germany.
Jarcilene Silva de
Almeida-Cortez
Biological Sciences Center, Botanics
Department, Universidade Federal
de Pernambuco – Recife (PE), Brazil.
Jörn Germer
Institute of Plant Production
and Agroecology in the Tropics
and Subtropics, University of
Hohenheim – Stuttgart (Baden-
Württemberg), Germany.
Joachim Sauerborn
Institute of Plant Production
and Agroecology in the Tropics
and Subtropics, University of
Hohenheim – Stuttgart (Baden-
Württemberg), Germany.
Address for correspondence:
Jan Mertens – Garbenstr. 13–
University of Hohenheim – 70599 –
Stuttgart (Baden-Württemberg),
Germany – E-mail: J.Mertens@
uni-hohenheim.de
ABSTRACT
Spondias tuberosa Arruda, a fructiferous endemic tree of semiarid Northeast
of Brazil, provides several services to its ecosystem as well as to humans. It
provides feed for wild animals and domestic ruminants in addition to providing
fruits that are rich in vitamins for the human diet. It is an important source of
additional income for family farmers and a source for traditional therapeutic
medicine. Despite the importance of this tree in northeastern Brazil, limited
scientific effort have been accomplished so far towards a better understanding
of the tree’s physiology and interaction within the ecosystem. Earlier studies
about S. tuberosa focused on phenology, physiology, population genetics,
management practices, and socioeconomic aspects. Due to the lack of
breeding and cloning programs, physiological studies and management trials
were based on heterogenic plant material, which led to ambiguous results.
In order to move forward with S. tuberosa research, especially for its genetic
conservations and agro-industrial exploitation, basic breeding and intensified
genetic research are urgently required. Despite the few publications on S.
tuberosa, the tree can be considered scientifically neglected, particularly if
compared with other members of the Anacardiaceae family.
Keywords: Umbuzeiro; Caatinga; fruit tree; multipurpose tree; ecosystem
service.
RESUMO
Spondias tuberosa Arruda, uma árvore frutífera endêmica do semiárido
do Nordeste do Brasil, oferece diversos recursos ao seu ecossistema, bem
como ao ser humano. Ela fornece alimento a animais selvagens e ruminantes
domésticos, além de frutas ricas em vitaminas para dieta do homem.
Essa árvore é uma importante fonte de renda extra para propriedades de
agricultura familiar, além de ser fonte para um medicamento terapêutico
tradicional. Apesar de sua importância no nordeste do Brasil, investiu-se
pouco em pesquisa até o momento para compreender melhor a fisiologia
dessa árvore, e como ela interage no ecossistema. Estudos anteriores sobre
a S. tuberosa focaram na fenologia, fisiologia, genética da população, práticas
de manejo e aspectos socioeconômicos. Por causa da ausência de programas
de reprodução e clonagem, estudos fisiológicos e ensaios de manejo
basearam-se em material de planta heterogênica, levando a resultados
ambíguos. Para que a pesquisa da S. tuberosa se desenvolva, em especial
para sua conservação genética bem como para sua exploração agroindustrial,
faz-se necessária a condução imediata de pesquisas de reprodução básica
e de genética intensificada. Apesar de haver algumas poucas publicações
sobre a S. tuberosa, é possível dizer que essa árvore tem sido negligenciada
do ponto de vista científico, em especial se comparada a outros membros da
família das Anacardiaceae.
Palavras-chave: Umbuzeiro; Caatinga; árvore frutífera; árvore polivalente;
serviço do ecossistema.
UMBUZEIRO (SPONDIAS TUBEROSA): A SYSTEMATIC REVIEW
UMBUZEIRO (SPONDIAS TUBEROSA): UMA REVISÃO SISTEMÁTICA
DOI: 10.5327/Z2176-947820151006
Mertens, J. et al.
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INTRODUCTION
The fructiferous Spondias tuberosa known locally as
Umbuzeiro or Imbuzeiro belongs to the Anacardiace-
ae family (LIMA, 1996), which contains several other
important tropical and subtropical fruit-bearing trees
such as Mangifera indica L., Anacardium occidentale L.,
Pistacia vera L., Rhus coriaria L., Spondias mombin
L., and Spondias purpurea L.. Out of the Anacardiaceae,
the genus Spondias is one of the most important in the
Brazilian context, because of its potential for agro-in-
dustrial exploitation (SILVA JUNIOR et al., 2004; ALMEI-
DA et al., 2007). Spondias includes 17 to 18 species
with 7 to 9 species occurring in the neotropics (SILVA
JUNIOR et al., 2004; MILLER & SCHAAL, 2005). Among
these, S. tuberosa is endemic to the semiarid north-
east region of Brazil, which is covered with deciduous,
thorny woodland vegetation called Caatinga (PRADO &
GIBBS, 1993; CAVALCANTI et al., 2002a; SILVA JUNIOR
et al., 2004; CAVALCANTI & RESENDE, 2006; SANTOS
& OLIVEIRA, 2008; REIS et al., 2010; ARAÚJO et al.,
2012). The common name Umbuzeiro is derived from
the tupi-guarani indigenous word “ymb-u”, which can
be translated as “the tree which gives water” (EPSTEIN,
1998; BARRETO & CASTRO, 2010). Its fruit is called Bra-
zilian plum locally known as Umbu, Imbu, Ambu or
Ombu (BARRETO & CASTRO, 2010). Umbuzeiro is con-
sidered a sacred tree, which is associated with the fact
that S. tuberosa starts to blossom and subsequently
leaves sprout before the onset of the rainy season. The
tree is worshipped by indigenous tribes in spiritual rit-
uals owing to these early signs of life in the otherwise
dormant Caatinga at the end of the dry season (MACH-
ADO et al., 1997; MONTEIRO, 2007; NADIA et al., 2007;
NETO et al., 2010). Due to its early blossom, Almeida
et al. (2011) claim S. tuberosa represents an import-
ant feed resource for pollinators and nectar sucking
animals during the dry season. Scientists indicate great
economic benefits of S. tuberosa for local smallholders
and families. Borges et al. (2007) found that during the
fruit harvest season, fruit picking and selling provide
employment and is a major source of income for the
dwellers in the semiarid northeast region of Brazil. The
fruit of S. tuberosa contributes significantly to house-
hold income (DRUMOND et al., 2001; REIS et al., 2010;
BARRETO & CASTRO, 2010). Moreover, S. tuberosa
is considered a medicinal plant with high importance
for indigenous tribes in the Caatinga (ALBUQUERQUE
et al., 2007, 2011). Irrespective of the significance of S.
tuberosa for local communities and the environment
of the Caatinga, the tree faces several natural and man-
made threats, which affect its natural regeneration.
According to the literature, the problem of natural re-
generation and a possible subsequent extinction of S.
tuberosa seem to be highly multi-factorial.
As S. tuberosa is not well known (NARAIN et al., 1992),
this work aims at raising attention to one of the eco-
nomically most important native trees of the scien-
tifically neglected semiarid northeast region of Brazil
(SANTOS et al., 2011b). Since the late 1980s about 100
articles on S. tuberosa were published, which are ac-
cessible through Google Scholar, SciElo, ScienceDirect,
Scopus, and WorldWideScience. Forty percent of the
articles are published only in Portuguese language with
an English abstract, which makes it difficult to reach a
large scientific audience and may contribute to the fact
that neither the general public nor the scientific com-
munity is familiar with S. tuberosa. We reviewed the
majority of the publications mainly on biology, physi-
ology, and management of S. tuberosa, which were ac-
cessible through the five databases mentioned earlier.
PHENOLOGY, ABUNDANCE, AND REPRODUCTIVE BIOLOGY
S. tuberosa is an up to 9 m tall xerophytic tree with a
stunted, and strongly branched trunk of approximately
0.3 to 1.4 m in diameter, and a characteristic umbrel-
la-like crown measuring 10 m in diameter (LIMA, 1996;
CAVALCANTI, 2008). The grayish trunk sheds its bark in
rectangle shaped plates (LIMA, 1996). The leaves are
pinnate and of an uneven number of oval leaflets (LIMA,
1996; EPSTEIN, 1998). Seedlings of S. tuberosa devel-
op a taproot system, which is substituted with fibrous
root systems within the first ten years after germina-
tion. The horizontal growth of the root system in this
period is greater than its vertical development (NETO
et al., 2009; CAVALCANTI et al., 2010), thus leading to
a shallow root system, which spreads underneath the
canopy area and grows up to 1.0 to 1.9 m depth (CAV-
ALCANTI & RESENDE, 2006; CAVALCANTI et al., 2010).
As an adaption to the semiarid climate, S. tuberosa
forms root tubers, in which the tree is able to store
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water, minerals, and organic solutes (LIMA, 1996; EP-
STEIN, 1998; DUQUE, 2004; CAVALCANTI et al., 2010).
This adaptation of the tree is essential for its survival
during the dry season (SILVA et al., 2008a; CAVALCANTI
et al., 2010) and for the commencement of flowering
before the onset of the wet season (MACHADO et al.,
1997; LIMA FILHO, 2007). An adult S. tuberosa tree can
have several hundred tubers with a mean tuber weight
of approximately 2 kg (CAVALCANTI et al., 2002b; CAV-
ALCANTI, 2008). Cavalcanti & Resende (2006) investi-
gated 12 adult S. tuberosa and found in average 907
tubers per tree with a mean tuber weight of 1.5 kg.
Cavalcanti et al. (2010) observed in average 112 tubers
per tree with a mean tuber weight of 0.9 kg while ex-
ploring the root system of 10 ten-year-old trees. Be-
sides the age of the tree, average annual precipitation
is a factor which seems to affect the number of tubers
per plant, as Cavalcanti et al. (2002b) observed a slight
decrease in tubers per tree during the study period
from 1995 to 1998 concomitant with and the annual
precipitation dropped in the same time on the exper-
imental plot from 348 mm to 147 mm (APAC, 2015).
S. tuberosa is abundant throughout the entire semi-
arid Northeast of Brazil, in the states of Piauí, Ceará,
Rio Grande do Norte, Paraiba, Pernambuco, Alagoas,
Sergipe, Bahia, and in northern Minas Gerais (EP-
STEIN, 1998; LIMA, 1996). Santos (1997) assumes
the five regions Tanquinho, Jeremoabo, and Ipupi-
ara in Bahia, Petrolina in Pernambuco, and Pio IX
in Piauí within the Caatinga as the origin of S. tu-
berosa because of the great phenotypic uniformity
found within these regions. The tree requires a daily
air temperature between 12°C and 38°C, relative air
humidity between 30% and 90%, 2,000 to 3,000 in-
solation hours per year, and 400 mm to 800 mm of
precipitation during the wet season from November
to February. Deep, free draining soils without stag-
nant moisture favor its growth (EPSTEIN, 1998). Tree
stand density of S. tuberosa varies widely within the
Caatinga. The theoretical total population of S. tu-
berosa ranges from 21 million to up to 630 million
individuals within an area of 845,000 km², which is
covered by caatinga. Santos (1997) claims differenc-
es in climate and soil types in such a vast area did
not influence evolution and phenotypic differenti-
ation of S. tuberosa. Neto et al. (2012, 2013) con-
firmed this uniformity in phenotype for areas with
different land use and management as well.
S. tuberosa is an andromonoecious tree with white pan-
icle inflorescence ranging from 0.1 to 0.2 m in length
(LIMA, 1996; EPSTEIN, 1998; CAVALCANTI et al., 2002a;
NADIA et al., 2007). The inflorescence is made of up to
155 flowers on average, of which 40% are hermaph-
rodite and 60% are male flowers (NADIA et al., 2007).
Almeida et al. (2011) found a slightly higher number
of flowers per inflorescence—176 on average—in S.
tuberosa located within an anthropogenic influenced
site, such as pastures, crop fields and/or corn (Zea
mays L.), beans (Phaseolus vulgaris L.) or cactus (Opun-
tiafícus-indica Mill.) plantations. Sixty percent of the
male flowers are located at the base of the inflores-
cence, whereas 90% of the hermaphrodite flowers are
located towards the apex of the inflorescence (NADIA
et al., 2007). The inflorescence has a flowering dura-
tion of two to seven days (NADIA et al., 2007; LEITE &
MACHADO, 2010). Depending on the region blossoms
appear from September to April with a peak in Novem-
ber before the onset of the wet season (MACHADO
et al., 1997; NADIA et al., 2007; LEITE & MACHADO,
2010; NETO et al., 2013; MENDES, 1990; CAVALCANTI
et al., 2000; BARRETO & CASTRO, 2010). Neto et al.
(2013) stated that the bloom of S. tuberosa is negative-
ly correlated with occurrence of precipitation.
S. tuberosa is not especially adapted to a specific pol-
linator. Up to 19 insect species were observed visiting
the entomophily and self-incompatible inflorescence
(NADIA et al., 2007; LEITE & MACHADO, 2010; ALMEI-
DA; ALBUQUERQUE; CASTRO, 2011). The visitors in-
cluded the following orders: Hymenoptera (Apidae,
Pompilidae, Vespidae), Diptera, and Lepidoptera. The
Lepidoptera are considered nectar thieves and their
visit does not result in pollination (NADIA; MACHA-
DO; LOPES, 2007; ALMEIDA et al., 2011). Barreto et al.
(2006) investigated the pollen load of pollinators vis-
iting S. tuberosa inflorescence. They found the sting-
less bees Trigona spinipes Fabricius and Frieseome-
litta doederleini Friese. The red paper wasp Polistes
canadensi Linnaeus are the most important among the
pollinators, as they were exclusively loaded with pollen
of S. tuberosa.
Reported ratios of flowers to fruits per inflorescence
of S. tuberosa indicate a very low fruit set. Almeida
et al. (2011) observed 0.55 fruits per flower on av-
erage. Leite & Machado (2010) found 0.01 fruits per
flower after natural pollination, and this ratio increased
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to 0.22 fruits per flower in cross-pollination, whereas
Nadia et al. (2007) found 0.01 fruits per flower after
natural pollination and 0.02 fruits per flower after
cross-pollination. They also investigated the effect
of a pollen donor and found no significant difference
in pollen originated from hermaphrodite flowers or
male flowers. As S. tuberosa flowers are self-incom-
patible, and no biparental inbreeding was observed of
the outcrossing species, the low fruit set is unlikely a
result of reduced offspring fitness due to inbreeding
(FRANKHAM, 2005; KELLER & WALLER, 2002; SANTOS
et al., 2011a; SANTOS & GAMA, 2013) (Table 1).
The drupe is about 3.2 cm long with a diameter of
2.8 cm, and weighs about 15.4 to 21.2 g (NARAIN et al.,
1992; SANTOS; 1997). The form of the greenish-yellow
fruit, which contains a greenish-white pulp covered by
a thin skin ranges from round to oval or oblong (LIMA,
1996). Fruit weight is made up of approximately 58%
pulp, 21% seed, and 21% skin. The pulp pH is about
3.1 with 9.47°Bx, and the content of titratable acids is
1.1%. Hundred gram of eatable portion of the fruit con-
tains 0.3 g ash, 1.5 g iron, 15.6 g calcium, and 27.9 g
phosphorus (NARAIN et al., 1992). Additionally, it is
a source of several vitamins, such as vitamin B1, B2,
B3, A, and C (VIDIGAL et al., 2011), and is one of few
native natural vitamin C sources for human consump-
tion in the driest regions of northeast Brazil (ARAÚJO
et al., 2001). The dispersal of S. tuberosa is exclusive-
ly zoochoric by native animals, such as gray brocket
(Mazama gouazoubira Fischer), black-rumped agouti
(Dasyprocta prymnolopha Wagler), collared peccary
(Pecari tajacu Linnaeus), fox (Dusicyon thous Linnae-
us), yellow armadillo (Euphractus sexcinctus Linnaeus),
the argentine black and white tegu (Tupinambis meri-
anae Linnaeus), greater rhea (Rhea americana Linnae-
us), white-naped jay (Cyanocorax cyanopogon, Wied)
as well as by human introduced cattle (Bos taurus Lin-
naeus) and goat (Capra hircus Linnaeus) (CAVALCA-
NTI et al., 2009; BARRETO & CASTRO, 2010; AZEVEDO
et al., 2013; GRIZ & MACHADO, 2001; CAVALCANTI &
RESENDE, 2003).
Table 1 – Floral characteristics of Spondias tuberosa according to Nadia et al. (2007).
Floral characteristics Hermaphrodite flower Male flower
Calyx (sepals) 5 5
Corolla (petals) 5 5
Short stamen/ anther 5/5 5/5
Long stamen/ anther 5/5 5/5
Apocarp 1 0
Ovary per flower 1 0
Pistil 1 1
PHYSIOLOGY
Studies published about the physiology of S. tu-
berosa focus virtually only on its response to min-
eral fertilization, salt- and water-stress, and its ju-
venile development.
In a field experiment, Drumond et al. (2001) tested the
effect of phosphorus and nitrogen fertilization com-
bined with irrigation on S. tuberosa seedling growth
in the first 40 months after transplanting ten-months-
old seedlings. None of the treatments in their exper-
iment showed a significant difference in plant height
due to the mineral fertilization or irrigation within their
40 months trial period. In contrast, Melo et al. (2005)
found a positive response of S. tuberosa seedling on
phosphorus and nitrogen fertilization on shoot height,
shoot diameter, above ground dry matter, leaf area,
and tuber diameter in their experiment in a mesh
greenhouse and calculated an optimal N and P dose of
99 kg ha-1 and 150 kg ha-1, respectively. Based on a six-
month pot experiment, Neves et al. (2008a) stated that
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the optimal P input for best shoot growth (height and
diameter), canopy area, and dry matter of root system
of S. tuberosa seedlings is approximately 281 mg dm-3.
They observed a negative effect on all assessed param-
eters beyond that input level.
Andrade et al. (2013) observed in a pot experiment a
negative effect of N and K fertilization on the devel-
opment of S. tuberosa seedlings, and on their root-
stock and survival. The authors concluded that the N
(350 – 2800 mg dm-3) and K (1800 – 7200 mg dm-3) ap-
plied doses reached toxic levels for S. tuberosa. Neves
et al. (2007a, 2007b) observed in a pot experiment
the highest dry matter production after application of
286 mg N dm-3 and 137–229 mg K dm-3. Beyond these
doses the authors also observed a negative effect of
N and K application on seedling growth. Lacerda et al.
(2009) observed a negative effect of N application on
seedling growth at only 0.65 mg dm-3 on their pot ex-
periment. Additionally, they showed an increased seed-
ling growth owing to increased Boron concentration in
the growth substrate. The greatest seedling growth in
the experiment was achieved when the seedling was
supplied with 3 mg B dm-3. Since the experiment was
conducted with a combined application of N and B, the
authors also observed a negative interaction of both.
The authors supposed that this might have been the
result of an ion antagonism. These experiments men-
tioned earlier were carried out under different growth
conditions—pot versus field experiment, and differ sig-
nificantly in the growth substrate used . It is difficult to
come to a conclusion based on few publications.
In a liming experiment Neves et al. (2008b) demon-
strated a positive effect of liming on seedling growth.
An increased base saturation because of liming led to
an increased content of Ca, Mg, and S in shoot and
leaves of S. tuberosa seedlings, whereas the content of
N, P, K, Cu, Fe, Mn, and Zn decreased (Table 2).
Ferri & Labouriau (1952) and Ferri (1953) were the first
authors discussing, inter alia, the internal water bal-
ance and stomatal behavior of S. tuberosa (LIMA FILHO
& SILVA, 1988). Lima Filho & Silva (1988) reevaluated
stomatal resistance, transpiration and leaf tempera-
ture of S. tuberosa at the end of the dry season and
after the onset of the wet season. Differences in leaf
temperature between dry and wet season could not
be observed, and the observed vapor pressure deficit
was also similar in both seasons. In both periods the
lowest stomatal resistance was recorded at 7:00 am
and was followed by an increase, yet the increase in
the dry season was more intense. The stomatal resis-
tance during wet season was maintained at a low value
almost until 1:00 pm, when consequently a high tran-
spiration was recorded. Lima Filho (2004) detected a
second peak with high stomata conductivity with sub-
sequent high transpiration rates and photosynthesis
rates during the wet season at 4:00 pm, in addition to
high stomata conductivity in the morning recorded by
Lima Filho & Silva (1988). Thus, S. tuberosa exhibits
a two-peaked daily course of gas exchange. Since the
stomatal resistance increased around 1:00 am, with
decreased stomatal conductivity, even though envi-
ronmental conditions were favorable for high transpi-
ration, Lima Filho & Silva (1988) concluded S. tuberosa
regulates its internal water balance according to a very
strict and accentuated stomata behavior, especially un-
der adverse conditions. Later, Lima Filho (2001) stated
S. tuberosa has two different strategies to maintain fa-
vorable internal water balance. Under dry conditions,
the author claimed, it maintains its internal water bal-
ance by expenses of water stored in the tubers and
by restricted transpiration, whereas during the wet
season, the internal water balance is maintained by
short-term osmotic adjustments, such as uptake of ad-
ditional inorganic salts or the accumulation of organic
solutes (LIMA FILHO, 2001). The very strict and accen-
tuated stomatal behavior reported by Lima Filho & Sil-
va (1988) and Lima Filho (2001, 2004) differs among
various phenotypes of S. tuberosa, in which some phe-
notypes appear to be more sensitive than others (SILVA
et al., 2009a) (the authors use the term genotype al-
though the accessions in the Germplasm Bank of Um-
buzeiro BGU were not categorized on genetic base [see
section Population genetics]). Two of the tested pheno-
types showed a correlation of stomatal behavior with
air temperature, relative humidity, and vapor pressure
deficit. One tested phenotype showed correlation with
photosynthetic active radiation, whereas one pheno-
type did not show any correlation of stomatal behavior
with the assessed environmental factors. The authors
concluded that the observed differences in anatomical
alteration in the different phenotypes, such as stoma-
tal density, stomatal index, and stomatal aperture size,
could not fully explain the physiological differences
among the tested phenotypes. Changes in leaf water
potential, concentration of carbohydrates, amino ac-
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ids, and proline in leaves and root tubers as a response
to intermittent drought differs in different phenotypes
as well (SILVA et al., 2009b). The concentration of pro-
teins in S. tuberosa leaves and root tubers did not vary
either because of induced drought, or because of dif-
ferent phenotypes in the same experiment. Since Silva
et al. (2009b) observed high leaf water potential even
though soil moisture reached the permanent wilting
point, the strategy of maintaining favorable internal
water balance by water stored in the tubers (LIMA FIL-
HO, 2001) seems factual.
S. tuberosa seedlings show a negative response in
growth on salt stress. However, when cultivated in a nu-
trient solution with a NaCl concentration up to 31 mM,
it proved to be moderately tolerant to salinity (NEVES
et al., 2004). The authors assume that this moderate
tolerance to salt stress is realized owing to the tubers
of the seedlings, which accumulates excess NaCl. Silva
et al. (2008a) observed negative effects of salinity on
the seedling growth if the NaCl concentration exceed-
ed 50 mM. The authors could not detect a decreasing
root/shoot ratio as reported by Neves et al. (2004).
Owing to the increase of root/shoot ratio observed in
their experiment, Silva et al. (2008a) stated the salinity
effects are more severe on the shoot growth than root
growth, which implies the root system of S. tuberosa is
less sensitive towards salt stress than observed in oth-
er crops, such as beans (SEEMANN & CRITCHLEY, 1985)
or wheat (JBIR et al., 2001).
POPULATION GENETICS
In order to conserve genetic variation of S. tubero-
sa, Embrapa Semiárido (Brazilian Corporation of Ag-
ricultural Research) in Petrolina, Pernambuco, Brazil
(Embrapa-CPATSA) established in 1994 a germplasm
collection (Germplasm Bank of Umbuzeiro [BGU]) in
its experimental site in the municipality of Petrolina.
Until 2012, it contained 79 accessions with the last
addition in 2002 (NASCIMENTO et al., 2002, 2012).
The accessions were categorized based on fruit char-
acteristics and tree habit (NASCIMENTO et al., 2002).
The first approach studying the genetic variability of
S. tuberosa was conducted in 2004 using the mixed
model methodology—restricted maximum likeli-
hood/best linear unbiased prediction (REML/BLUP)
(OLIVEIRA et al., 2004). After evaluating plant height,
canopy diameter, basal trunk diameter, and number
of primary branches of 42 trees from three differ-
ent regions, the authors concluded that the greater
genetic variability is found within local S. tuberosa
populations compared to the variability in between
populations of different ecoregions. The first study on
the genetic level of S. tuberosa was conducted by San-
tos et al. (2008), assessing the genetic variability with
the amplified fragment length polymorphism (AFLP)
method. Their results objected the findings of Oliveira
et al. (2004), as Santos et al. (2008) observed a high
variability in between ecoregions, whereas within lo-
cal populations higher similarities were observed in
the resulting dendrogram. The AFLP method was also
used to determine the outcrossing rate of S. tubero-
sa (SANTOS et al., 2011a; SANTOS & GAMA, 2013).
In both studies, which combined AFLP with the mixed
mating model, a high heterozygosity in the offspring
generation was observed. This observation shows
that S. tuberosa is predominantly an outcrossing
species. Since the differential of the multilocus out-
crossing estimation and the single-locus estimation
was small, a parental inbreed could not be observed.
Table 2 – Leaf concentration of mineral nutriments if Spondias tuberosa seedling is balanced nutrient supplied.
Mineral nutriment Quantity (mg g-1 dry matter) Author
N 25.72–29.48 Neves et al. (2007b)
P 1.52–1.92 Neves et al. (2008a)
K 3.40–6.04 Neves et al. (2007a)
Mg 2.80–3.26 Neves et al. (2008b)
Ca 18.28–21.47 Neves et al. (2008b)
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In conclusion, Santos et al. (2008) and Santos et al.
(2011a) recommended numerous protection areas
for in situ conservation of genetic variability of S. tu-
berosa or broad fruit sampling in various ecoregions
for ex situ genetic variability conversations. The latter
already exists in form of the BGU of Embrapa even
though its accessions are categorized based on phe-
notype characteristics.
MANAGEMENT PRACTICES
For plantations a density from 39 to 100 plants ha-1 is
recommended for S. tuberosa with a tree spacing rang-
ing from 10 m x 10 m to 16 m x 16 m (EPSTEIN, 1998).
The suggested size of the planting hole is 40 cm x 40 cm
x 40 cm or 50 cm x 50 cm x 50 cm and the refill earth
should be enriched with 20 l of cow manure, 300 g of
simple superphosphate, and 100 g of potassium-chlo-
ride - depending on the soil type and soil fertility (EP-
STEIN, 1998).
Seeds of S. tuberosa have naturally a very distinct dor-
mancy, which remains an obstruction for commercial
seedling production. Few, partly antithetical, research
works investigated how the dormancy of S. tuberosa
seeds can be overcome. The effect, which accounts
for the natural reproduction and agro-industrial ex-
ploration discussed in literature, is the maturation of
seeds after the abscission of the fruits. Araújo et al.
(2001) showed a strong increase in germination after
24 months of seed maturation. This maturation peri-
od lead to a germination of 73.6% compared to the
germination of 22.8% of freshly harvested seeds. Ac-
cording to the authors, only 12 months of maturation
significantly increases the germination to 27.7%. Ac-
cording to Cavalcanti et al. (2006) a maturation time
of 24 to 48 months leads to the highest germination
percentage between 60.0% and 72.5% within 30 days
after sowing. Magalhães et al. (2007) tested the in-
fluence of 13 different maturation periods: 0, 30, 60,
90, 120, 150, 180, 210, 240, 270, 300, 330, and 360
days. After a maturation period of 90 up to 210 days
they observed the highest germination of 70% and a
decrease in germination beyond a maturation time of
300 days. A fourth work observed the highest germina-
tion between 120 and 210 days of maturation (LOPES
et al., 2009), which differs only slightly from the work
of Magalhães et al. (2007) and confirms their findings.
Besides the storage period, storage conditions and
fruit ripeness affect the germination, which were not
consistent in the publications mentioned earlier (com-
pare section “Conclusion”).
Methods to break the dormancy of S. tuberosa seeds
discussed in literature with importance for agro-indus-
trial exploration are mechanical, chemical and thermal
scarification, and immersion in water or growth promot-
ing solutions such as gibberellic acid, ethylene, or cyto-
kinin. Chemical scarification and thermal scarification
are not appropriate methods to break the dormancy of
S. tuberosa seeds. Seeds treated with these methods
showed a significantly lower germination percentage
than the control seeds (ARAGÃO et al., 2008). Lopes
et al. (2009) did not detect any germination after the
seeds were treated with H2SO4 for 10 minutes. Neither
Lopes et al. (2009) nor Melo et al. (2012) observed any
positive effect on germination owing to treatment with
growth regulating solutions. Immersion of the seeds in
water for 24 hours slightly increased the germination
(ARAGÃO et al., 2008); however, the most appropri-
ate method seems to be the mechanical scarification
by a beveled cutting distal of the seed, introduced by
Epstein (1998), to allow water to easily soak the seed.
Lopes et al. (2009) and Aragão et al. (2008) observed
the highest germination after such treatment. Howev-
er, Neto et al. (2009) and Melo at al. (2012) stated even
mechanical scarification does not break dormancy of S.
tuberosa seeds.
According to Cavalcanti et al. (2002a), the most suit-
able substrate for S. tuberosa germination and greater
shoot height and shoot diameter is the actual Caatinga
soil. Growth substrate made of soil and cattle manure
(50:50 v/v) lead to the biggest canopy area and subse-
quent highest dry matter (CAVALCANTI et al., 2002a).
Besides the generative propagation, S. tuberosa can
be propagated by vegetative reproduction with stem
cuttings (EPSTEIN, 1998; LIMA, 1996), which is of in-
terest for the agro-industrial use of S. tuberosa since
the uncertain and time demanding germination will by
skipped. S. tuberosa propagated by stem cutting is not
prone to form root tubers and it is not recommend-
ed to plant such trees in areas with limited soil water
availability (LIMA FILHO, 2007), unless such trees are
Mertens, J. et al.
186
RBCIAMB | n.36 | jun 2015 | 179-197
placed in a plantation with additional irrigation. Melo
et al. (1997) experimented a different form of vege-
tative propagation to produce living germplasm for
genetic conservation of S. tuberosa. They succeeded
with micro-propagation of nodal segments of one-
year-old seedlings on a Murashige and Skoog medium
(MS0) (MURASHIGE & SKOOG, 1962) with 0.1 mg/l
BAP (6-Benzylaminopurine, C
12
H
11
N
5
) to obtain 2.2 new
sprouts on average after one week of cultivation. In the
control treatment, 1.5 shoots sprouted. They also test-
ed IBA (C
12
H
13
NO
2
), which seemed to hamper sprouting
as did higher doses of BAP. Dutra et al. (2012) found IBA
did not have a positive effect on growth of S. tuberosa
in their experiment as well. Even though they claim IBA
promotes root growth when used to propagate S. tu-
berosa by air layering, they could not show a significant
effect of IBA concentrations on the development and
growth of root tissue.
In 1990 and 1991, two works were published on suc-
cessful grafting of S. tuberosa (MENDES, 1990; PEDRO-
SA et al., 1991), which seems to be a promising method
for commercial seedling production, as grafted seed-
lings start to produce fruits after four years, whereas
non-grafted seedlings bear fruits only after 10 years
(MENDES, 1990; NASCIMENTO et al., 1993). Espindo-
la et al. (2004) tested how two different size classes
(7–9 mm; 4–6 mm) of the scion, cleft graft, and splice
graft affect the development of the grafted seedling.
The viability of the seedlings after 15 days did not differ
between the two grafting methods and the different
methods had no influence on the development of the
seedlings within the first 45 days. However, the authors
observed that larger scions significantly formed more
sprouts than the smaller ones. A similar effect of diam-
eter was noted by Gomes et al. (2010), who investigat-
ed the effect of rootstock diameter and grafting meth-
od on seedling development. They observed a positive
effect in larger diameter rootstock on the growth of
grafted seedlings within the first 120 days regardless
of the grafting method. In their experiment, the suc-
cess of the grafting was dependent on the method cho-
sen. The fixation of the scion was significantly higher if
the splice graft was conducted regardless of the root-
stock diameter. This was already observed by Araújo &
Neto (2002) in their experiment. Additionally, the au-
thor stated neither the physiological nor phenological
state of a tree the scion is taken from, has influence on
the success of grafting, which allows grafting through-
out the entire year. Six months after germination, S. tu-
berosa seedlings can already be used as rootstock for
grafting, and the ability will not change until the root-
stock exceeds six years of age. After six years, the suc-
cess rate of grafting reduces gradually (REIS et al.,
2010). The effect of grafting on the tuber production of
S. tuberosa, as seen under stem cutting conditions, has
not yet been investigated.
Narain et al. (1992) identified an absence of plantations
of S. tuberosa. The fruit production of Brazilian plum is
limited to extractivism. Neto et al. (2010) observed the
management of S. tuberosa is limited to tolerance of
native trees, fruit picking, and in particular cases, pro-
tection manners against an abundant epiphyte, Tiland-
sia sp. In addition, little is known about pest and dis-
eases of S. tuberosa and its fruits. Pests and pathogens
associated with S. tuberosa are Phasmatodea spp.,
Diabrotica speciosa Germar, Megalopyge lanata Stoll,
Cryptotermes spp., Pinnaspis spp., Elsinoë spp., Sep-
toria spp., Glomerella cingulata (Stoneman) Spauld.
& H. Schrenk, and Guignardia spp. (FREIRE & BEZER-
RA, 2001; NEVES & CARVALHO, 2005; TAVARES et al.,
1998). Two fruits flies, Ceratitis capitata Wiedemann,
and Anastrepha obliqua Macquart, are associated with
the Brazilian plum and are considered as postharvest
pests (ARAUJO et al., 2005; SILVA et al., 2008b).
ECONOMIC ASPECTS
S. tuberosa is considered a multipurpose tree whose
foliage is used for animal feed, and its fruits and
root-tubers contribute to human diet. It also gener-
ates fuelwood, and its bark, bast and resin are uti-
lized for therapeutic practices (LIMA, 1996; EPSTEIN,
1998; ALBUQUERQUE et al., 2007; NETO et al., 2010;
SILVA et al., 2009c). To ban the utilization of S. tubero-
sa as fuelwood, a draft law (Law Project Nº 3.548) to
prohibit felling the tree was introduced in 2004 (DU-
ARTE, 2004).
The fruit itself is the most important product of S. tu-
berosa. It is consumed in Brazil in natura or processed
as juice, sweet, jam, ice cream, and umbuzada (fruit
pulp boiled with milk and sugar) (NARAIN et al., 1992;
NETO et al., 2010). Frozen industrial processed fruit
Umbuzeiro (spondias tuberosa): a systematic review
187
RBCIAMB | n.36 | jun 2015 | 179-197
pulp is also exported to several European countries
(NARAIN et al., 1992). The reported annual yields of
S. tuberosa vary largely. Santos (1999) observed an-
nual yields in 16 trees ranging from 4.2 kg to 184.0 kg
of fresh fruits per tree, with a mean of 61.5 kg. Cav-
alcanti et al. (2008) reported annual yields ranging
from 206.9 kg to 531.2 kg of fresh fruits per tree with
a mean of 323.6 kg based on 66 trees. As Cavalcanti
et al. (2011) noted an increase of fruit production ow-
ing to additional irrigation, the observed wide range in
fruit yield may primarily be due to the great variation
in precipitation throughout the Caatinga. Especially the
precipitation in the beginning of the rain season from
November to December is very important for yield for-
mation (CAVALCANTI et al., 2011). Fruit yield per tree
increases in strong correlation to the canopy diameter
(SANTOS & NASCIMENTO, 1998). Thus, the variation in
yield seems to be primarily defined by climatic factors
and tree age (Table 3).
Family farmers involved in Brazilian plum harvest in
2007 generated an averaged additional income of
670 BRL within 55 days of harvest, which equals about
two minimum wages (CAVALCANTI, 2008). If harvest-
ing farmers or cooperatives additionally process the
fruits, their benefits could increase approximately
1,025%, owing to adding value (BARRETO & CASTRO,
2010). In 2012, 7,979 t of Brazilian plum were harvest-
ed, which generated a monetary value of approximately
US$ 3,820,500 (Table 4). This underlines the economic
importance of the Brazilian plum commercialization for
the rural communities, especially if processing is done
in the communities. Using the root tubers of S. tuberosa
Table 3 – Chemical composition of 100 g of the eatable portion of Brazilian plum, modified from Narain et al. (1992).
Constituents
Moisture [g] 87.25
Fat [g] 0.85
Protein [g] 0.31
Crude fiber [g] 1.04
Total sugars [g] 5.38
Starch [g] 1.41
Tannin [g] 0.12
Ascorbic acid [mg] 15.80
Table 4 – Quantity and value of Brazilian plum harvest in 2012 (IBGE, 2015). 1 BRL ≈ 0.50 USD in 2012.
Federal State Quantity (t) Value (1,000 BRL)
Piauí 56 55
Ceará 38 53
Rio Grande do Norte 231 453
Paraíba 83 59
Pernambuco 403 281
Alagoas 34 25
Bahia 7,010 6,615
Minas Gerais 124 100
Mertens, J. et al.
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RBCIAMB | n.36 | jun 2015 | 179-197
seedlings to produce pickles could generate further in-
come for family farmers. Pickles produced of 120 days
old seedlings, cultivated in washed sand and pickled
with salt and ascorbic acid show a high consumer ac-
ceptance (CAVALCANTI et al., 2004). To produce the
needed seedlings, the authors suggested using seeds
that remain from pulp or juice production, as they are
already available.
A further branch of commercial exploration of S. tubero-
sa might be the oil obtained from seed kernels. The oil
content of the kernels, approximately 56%, is very high
compared to cashew nut (46%) or sesame seeds (49%)
(BORGES et al., 2007). The authors observed a favorable
ratio of the oleic and linoleic fatty acids, and a high con-
tent of minerals. They suggested the oil of S. tuberosa
may be an edible oil for food enrichment and even uti-
lized as frying oil. Screening the oil for toxins or aller-
genic factors was not carried out (Table 5).
The foliage of S. tuberosa, which is utilized for animal
feed, has a slightly higher content of crude protein
during the wet season compared with other native
Caatinga species, which makes it an interesting alter-
native animal feed (LIMA, 1996; CAVALCANTI et al.,
2004). The crude protein content of the foliage drops
by 31% during dry season and, consequently, the in vi-
tro digestibility drops from 46% to 40%. Cavalcanti et al.
(2004) quantified the amount of foliage consumed by
Caprinae during wet and dry season per S. tuberosa.
The authors observed that Caprinae consume approx-
imately 19 kg foliage per tree during the wet season
and approximately 39 kg foliage per tree during the dry
season and concluded that S. tuberosa is a very important
alternative food source for animal husbandry in the semi-
arid Northeast of Brazil. During fruit season, S. tuberosa
contributes considerably to animal nutrition too, as
one goat consumes more than ten thousand fruits per
fruit season, which equals to approximately 131 kg of
Brazilian plum (RESENDE et al., 2004).
Table 5 – Fatty acids composition of Brazilian plum kernel and other
oil plants, compiled from Borges et al. (2007), Ivanov et al. (2010), Wang et al. (2012), and Were et al. (2006).
Fatty acids composition (%) Ratio
oleic/linoleic acid16:0 18:0 18:1 18:2 20:0
Brazilian plum kernel oil 19.4 11.3 34.4 33.7 0.6 1/0.98
Sesame seed oil 8.2 4.9 37.6 47.8 0.5 1/1.27
Peanut oil 11.0 3.3 43.2 35.0 1.6 1/0.81
Soybean oil 17.0 5.2 16.0 47.6 1.4 1/2.98
SPONDIAS TUBEROSA, A MEDICAL PLANT
Among the dwellers and indigenous tribes of the Caat-
inga, S. tuberosa is considered a medical plant (ALBU-
QUERQUE & OLIVEIRA, 2007; ALBUQUERQUE et al.,
2007, 2011; ALMEIDA et al., 2010; NETO et al., 2010;
FERREIRA JÚNIOR et al., 2011). Interviews with lo-
cal communities reveal that in traditional therapeutic
practices, bark, bast, leaves, fruits, roots, and resin of S.
tuberosa are used to treat numerous symptoms, such
as conjunctivitis, ophthalmia, venereal diseases, di-
gestive problems, colic, diarrhea, diabetes, menstrual
disturbances, renal infection, throat afflictions, kidney
inflammation, tooth pain, and “not healing cut” (ALBU-
QUERQUE et al., 2011; FERREIRA JÚNIOR et al., 2011).
None of the publications above mentioned which plant
parts are used for which purposes and whether the
plant parts are utilized in natura, as extraction or infu-
sion. The therapeutic efficacy of S. tuberosa drugs may
be a result of the high content of tannins and flavo-
noids detected in bark and fruit, which are considered
as wound-healing and anti-inflammatory active (ARAÚ-
JO et al., 2008). The content of tannin and antioxidant
activity varies in plants owing to environmental and ge-
notypic factors, and plant age as summarized by Araújo
et al. (2012). The same authors investigated whether
different habitats influence the tannin content and an-
tioxidant activity in S. tuberosa. They observed a sig-
Umbuzeiro (spondias tuberosa): a systematic review
189
RBCIAMB | n.36 | jun 2015 | 179-197
nificant difference in antioxidant activity owing to the
collection site, whereas the tannin concentration did
not show significant difference. Since other studies
showed a correlation between tannin concentration
and antioxidant activity (HE et al., 2011; AOUDIA et al.,
2013), Araújo et al. (2012) concluded that the antioxi-
dant activity of S. tuberosa might be influenced by oth-
er metabolites, whose production and accumulation is
more sensitive to differences in habitat.
Besides traditional therapeutic practices, S. tubero-
sa became the focus of academic medicine as well.
In 1997, 75 Brazilian plant species, including S. tubero-
sa, were screened for antitumor active extracts (MO-
RAES et al., 1997; PESSOA et al., 2006). Moraes et al.
(1997) reported an inhibition of Walker’s tumor growth
of 18% after treating with a crude hydroalcoholic ex-
tract of S. tuberosa bark. As the authors considered the
extracts active if the inhibition exceeded 40%, the ex-
tract of S. tuberosa was not considered antitumor ac-
tive. S. tuberosa may provide a breakthrough for the de-
velopment of an anti-dengue virus agent. The recently
developed and tested anti-dengue virus vaccine—the
Sanofi Pasteur dengue vaccine—provides protection
against dengue virus type 1, 3, and 4 but does not pro-
vide significant protection against dengue virus type 2
(DENV 2) (BÄRNIGHAUSEN et al., 2013). S. tuberosa re-
search may not provide a solution for the vaccination
dilemma, but it shows promising results for developing
an anti-dengue virus agent. Silva et al. (2011) tested
secondary metabolites, phenolic compounds, of S. tu-
berosa and Spondias mombin for their antiviral activity
against DENV 2. The authors identified two flavonoids
in the leaf extract of the two Spondias species with
antiviral activity—rutin and quercetin—and only in
S. tuberosa both were present (Table 6). Rutin and
quercetin showed in vitro a viral inhibiting effect of
DENV 2 in C
6/36
cells of 68.42% and 50%, respectively.
In conclusion, the author stated that rutin and querce-
tin extracted from S. tuberosa leaves have potential for
the development of an anti-DENV 2 agent. However,
further studies with other cell lines and in vivo survey
are required to affirm the effectiveness of these flavo-
noids against DENV 2 (SILVA et al., 2011).
CONCLUSION
To date S. tuberosa is hardly domesticated (NETO et al.,
2012), and all experiments were virtually conducted
with wild types. Additionally, no homogeneous plant
material is available. The highest uniformity in plant
material was achieved by grafting S. tuberosa seedlings
at Embrapa Semiárido. Even though the scions are
obtained from the same tree as well as the seeds,
which formed the rootstock, the grafted seedlings are
not genetically identical. Because seeds from the same
stock plant are genetically heterogeneous, which is
caused by self-incompatible and outcrossing feature
of the reproduction system of S. tuberosa. In addition,
some publications use the term clone or genotype
erroneously for grafted S. tuberosa seedlings from
Embrapa Semiárido. To the best of our knowledge,
neither cloning nor breeding was successfully executed
to date. Owing to the lack of clones or hybrids,
physiological studies conducted on S. tuberosa seedlings
are difficult to interpret since observed outcomes may
have resulted from the genetic diversity and not from
applied treatments. Moreover, grafting of S. tuberosa
is the key method for its commercial propagation in
tree nurseries to obtain refined seedlings for a fast
fruit production.
Besides the heterogeneity of the used plant materi-
al, comparing existing results with each other faces
further constraints, which we want to illustrate with
the results from the P fertilization experiments and the
Table 6 – Quantities of flavonoids in Spondias species, modified from Silva et al. (2011).
Components S. mombin (mg/g extract) S. tuberosa (mg/g extract)
Rutin n.d.* 53.38
Quercetin 41.56 169.76
*not detected
Mertens, J. et al.
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RBCIAMB | n.36 | jun 2015 | 179-197
seed maturation experiments. Consulting literature for
the optimal P fertilization is a difficult task owing to the
lack of methodological consistency among the studies.
On the one hand, there are field experiments, and on
the other hand, pot experiments using different bases
for calculating the fertilizer dose: per plant versus per
hectare versus per soil volume. Whereof the calcula-
tion based on weight per volume is rather unorthodox.
Therefore, it is difficult to compare the results concern-
ing the response of S. tuberosa seedlings on P fertiliza-
tion. This shows a dilemma in S. tuberosa research, as
only few studies, which are hardly comparable owing
to the lack of standardization on the units used in the
fertilizer application, are available. A unit, which can
be supposedly deduced from the three P fertilization
experiments published, is g plant-1. This unit is not pre-
cise, in addition to being unserviceable.
The partly opposing findings on germination after seed
maturation may result from the inconsistent conditions
of the seeds storage during maturation. Araújo et al.
(2001), Magalhães et al. (2007), and Lopes et al. (2009)
stored the seeds under controlled conditions with 10°C,
22.5°C, 25°C, respectively. Only Cavalcanti et al. (2002a)
stored the seeds under ambient conditions in dry soil,
which comes close to natural conditions seeds encoun-
ter in the Caatinga. The antithetical findings may also
have occurred owing to differences in the maturation
of the fruits. Souza et al. (2005) observed a significant
effect of degree of ripeness of the fruit itself on the
germination of S. tuberosa seeds. The other authors
mentioned previously did not comment on degree of
ripeness of their experimental material or neglected
this information. Therefore, the results are again dif-
ficult to compare owing to different experimental set-
ups and to the lack of methodological consistency.
S. tuberosa research in general is not yet very ad-
vanced and lacks accessibility. For instance, Sco-
pus shows only 58 hits for S. tuberosa in the time
period between 1980 and 2015, whereas other
wider distributed and economically more import-
ant members of the family Anacardiaceae, such as
mango and cashew, generated 522 and 521 hits re-
spectively in the same period. The lack of scientific
work was also noted by Neves & Carvalho (2005)
in their publication. The scarce availability of stud-
ies about S. tuberosa is present in all aspects of its
research, and only a few researchers and research
groups worked on S. tuberosa, which is reflected
in the little number of different authors and their
recurrence. Despite its economic and medical po-
tential for northeast region of Brazil, we consider S.
tuberosa scientifically neglected to date. In order
to progress in S. tuberosa research, we suggest fo-
cusing on following research fields:
• Vegetative propagation/ cloning;
• Breeding and establishing cultivars;
• Management practices;
• Utilization as medical plant and oil source;
To increase the understanding of S. tuberosa, espe-
cially for its further agro-industrial exploitation and its
medical use, scientific effort is still required. To avoid
a depletion of the natural S. tuberosa population, ef-
forts are required in breeding and management prac-
tices in order to shorten the time between germination
and first fructification to make S. tuberosa plantations
profitable. Simultaneously, efforts are required to un-
derstand S. tuberosa in its habitat, with its problematic
reproduction in mind, in order to maintain and protect
its genetic diversity.
ACKNOWLEDGEMENTS
This work was supported by the German-Brazil-
ian joint research project INNOVATE (Interplay
between the multiple uses of water reservoirs via
innovative coupling of substance cycles in aquatic
and terrestrial ecosystems). The project is funded
by the German Federal Ministry of Education and
Research (BMBF) under project number 01LL0904B
and the Brazilian Ministry of Education. The first
author would also like to thank for the support by
the Foundation fiat panis Ulm, Germany. The sole
responsibility for the content of this publication
lies with the authors.
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