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Solanum lycocarpum
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| Solanum lycocarpum | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Solanales |
| Family: | Solanaceae |
| Genus: | Solanum |
| Species: | S. lycocarpum
|
| Binomial name | |
| Solanum lycocarpum | |
Solanum lycocarpum, or wolf apple, is common in the Brazilian Cerrado ecoregion. In Portuguese, the plant is called lobeira (lit. 'wolf's plant') or fruta-do-lobo ('wolf's fruit').[1] The name "wolf's apple" comes from the fact that its fruit accounts for more than 50% of maned wolves' diet.[1] Likewise, the scientific name "lycocarpum" is formed from Latinized Greek elements "lyco-", meaning "wolf", and "carpum" meaning "fruit".[2]
Range
[edit]The native range of the wolf apple tree is the Brazilian savannah, but it grows also on pastures and disturbed land, such as highway margins, in various parts of Brazil.[3] It prefers moist, clay soil, full sun, and mild temperatures.[4][5]
Description
[edit]

The wolf apple plant is a flowering shrub or small tree with round open crown, ranging in height from 1.2 to 5 m (4 to 16 ft). The large leaves are 16 to 28 cm (6 to 11 in) long, simple but deeply lobed, tough, and covered in a soft grey-white fuzz, in alternate disposition.
Plants flower through the year, but more intensely during the dry season, from late fall to early spring. The flowers are similar to those of the bitter nightshade: star-shaped, with five sepals, five blue or purple petals fused at the base, and five large yellow anthers that release pollen through an opening at the tip. The flowers are arranged in helical monochasal cyme, opening from the base up. Flowers lack nectar, and are either male or hermaphroditic. The latter produce fruit after cross-pollination by several species of pollen-collecting bees, including Xylocopa virescens, X. frontalis, Oxaea flavescens, Centris scopipes, C. fuscata, Bombus morio, Exomalopsis sp., Pseudaugochloropsis graminea, Apis mellifera, and Megachile benigna.[4][5]
Fruit production occurs mostly between December and January. The fruits are large, up to 20 cm (8 in) in diameter and weighing 900 g (2 lb) or more, and contain up to 500 dark brown comma-shaped seeds, about 7 mm × 5 mm × 2 mm (1⁄4 in × 3⁄16 in × 1⁄16 in).[6] The rind is thin and lustrous, and remains green even after ripening.[6] The pulp is yellowish, soft, sweetish and extremely aromatic.[3] They resemble the tomato in external shape and internal morphology,[5] but also the eggplant for the texture and color of the flesh. The maned wolf is an important seed-spreading agent.[7]
Uses
[edit]Culinary use
[edit]The ripe fruits are edible to humans, and are consumed by local populations in jams and preserves, but the unripe fruits are quite rich in tannin.[5] The fruits are used as a fallback source of food for cattle in the dry season.
At the onset of maturation, the whole fruit contains 85% moisture (by weight), 5% starch, and 10% other residue.[3] The dry pulp, without peel and seeds, yields over 50% starch, more than cassava.[8] The starch is locally separated by blending the fruit with water and straining.[3]
The pulp of the ripe fruit contains about 75% moisture, 11% carbohydrate, 1% fat, 1% protein, 1% ash, 2.5% soluble fiber, and 2% insoluble fiber. The main volatiles in the ripe fruit are hexanal (which has the scent of grass) and ethyl butanoate (scent of apple), although dozens of other compounds contribute to the fruit's aroma.[9]
All other parts of the plant are poisonous to humans. However, the leaves are eaten by cattle, and are also an important food source for the bat Platyrrhinus lineatus.[10]
Medicine
[edit]Currently, there are no proven medicinal uses for the wolf apple, but the plant is used in the local folk medicine for obesity, cholesterol reduction, and as a treatment for diabetes.[5] About 30% of the starch extracted from almost-ripe fruits, which commercialized as capsules, is digestion-resistant,[3] which seems to be the rationale for these popular uses.[11] High-fiber Solanum lycocarpum flour was found to reduce diabetes symptoms in diabetic rats;[12] however, the starch did not show such effect.[13]
The fruit contains about 1.5% of glycoalkaloids in its dried fruits, chiefly solamargine and solasonine,[14] mostly in the peel and seeds.[3] Extracts have been shown to kill in vitro the human parasites Schistosoma mansoni[15] and Giardia lamblia,[16] Leishmania amazonensis,[17] and Leishmania infantum.[18] The main phenolic compounds in ethanol extracts of the ripe fruits are caffeic acid and chlorogenic acid.[19]
It is believed that the fruits protect the maned wolf from infection of the giant kidney worm, which is usually fatal for the animal.[5]
Solanum lycocarpum fruit extracts have also been shown to kill larvae of the Culex mosquito.[20]
Pests
[edit]The wolf apple tree is the natural host of the larva of the butterfly Leucanella memusae. Contact with the urticating bristles of this caterpillar may result in severe dermatitis and hemorrhage.[21]
The weevil Collabismus clitellae lays eggs into stems of the plant, causing the formation of galls, with measurable harmful effect on the plant's growth and fruit production.[22]
References
[edit]- ^ a b J. C. Motta-Junior, S. A.Talamoni, J. A. Lombardi, and K. Simokomaki (1996): "Diet of the maned wolf, Chrysocyon brachyurus, in central Brazil". Journal of Zoology, volume 240, issue 2, pp. 277–84. doi:10.1111/j.1469-7998.1996.tb05284.x
- ^ Edmund C. Jaeger (1944): A Source-Book Of Biological Names And Terms. pp. 41, 153. Published by Charles C. Thomas, Illinois.
- ^ a b c d e f M. T. P. S. Clerici, C. Kallmann, F. O. G. Gaspi, M. A. Morgano, F. Martinez-Bustos, and Y. K. Chang (2011): "Physical, chemical and technological characteristics of Solanum lycocarpum A. St. HILL (Solanaceae) fruit flour and starch". Food Research International, volume 44, issue 7, pp. 2143–50. doi:10.1016/j.foodres.2011.01.060
- ^ a b A.T. Oliveira-Filho and L. C. A. Oliveira (1988): "Biologia floral de uma população de Solanum lycocarpum St. Hil. (Solanaceae) em Lavras". Revista Brasileira de Botânica, volume 11, pp. 23–32. Abstract accessed on 2020-06-30
- ^ a b c d e f Fernando Tatagiba (2006): "Lobeira, fruta-de-lobo". Online article on the Biólogo website, published 2006-10-06. Accessed on 2020-06-30.
- ^ a b Lilian V. A. Pinto, Edvaldo A. A. Da Silva, Antonio C. Davide, Valquíria A. Mendes De Jesus, Peter E. Toorop, Henk W. M. Hilhorst (2007): "Mechanism and control of Solanum lycocarpum seed germination". Annals of Botany, volume 100, issue 6, pp. 1175–1187. doi:10.1093/aob/mcm211
- ^ J. A. Lombardi and J. C. Motta Jr. (1993): "Seed dispersal of Solanum lycocarpum St. Hil. (Solanaceae) by the maned wolf, Chrysocyon brachyurus Illiger (Mammalia, Canidae)." Ciência e Cultura, volume 45, pp. 126–27.
- ^ Aline M. Pascoal, Maria C. B. Di-Medeiros, Karla A. Batista, Maria I. G. Leles, Luciano Moraes Lião, and Kátia F. Fernandes (2013): "Extraction and chemical characterization of starch from S. lycocarpum fruits". Carbohydrate Polymers, volume 98, issue 2, pp. 1304–10. doi:10.1016/j.carbpol.2013.08.009
- ^ Ana P. A. Pereira, Célio F. F. Angolini, Bruno N. Paulino, Leonardo B. C. Lauretti, Eduardo A. Orlando, Joyce G. S. Silva, Iramaia A. Neri-Numa, Jane D. R. P. Souza, Juliana A. L. Pallone, Marcos N. Eberlin, and Glaucia M. Pastore (2019): "A comprehensive characterization of Solanum lycocarpum St. Hill and Solanum oocarpum Sendtn: Chemical composition and antioxidant properties". Food Research International, volume 124, pp. 61–69. doi:10.1016/j.foodres.2018.09.054
- ^ Ludmilla M. de S. Aguiar (2005): "First record on the use of leaves of Solanum lycocarpum (Solanaceae) and fruits of Emmotum nitens (Icacinacea) by Platyrrhinus lineatus (E. Geoffroy) (Chiroptera, Phyllostomidae) in the Brazilian Cerrado". Revista Brasileira de Zoologia, volume 22, issue 2, pp. 509–10. doi:10.1590/S0101-81752005000200030
- ^ Rodrigo Dall’Agnol and Gilsane L. von Poser (2000): "The use of complex polysaccharides in the management of metabolic diseases: the case of Solanum lycocarpum fruits". Journal of Ethnopharmacology, volume 71, issues 1–2, pp. 337–41. doi:10.1016/S0378-8741(00)00165-3
- ^ Fabiane Farina (2010): "Glycemic and urinary volume responses in diabetic mellitus rats treated with Solanum Lycocarpum." Applied Physiology, Nutrition, and Metabolism, volume 35, issue 1, pp. 40–44. doi:10.1139/H09-131
- ^ A. C. P. Oliveira, D. C. Endringer, R. J. P. Araújo, M. G. L. Brandão, and M. M. Coelho (2003): "The starch from Solanum lycocarpum St. Hill. fruit is not a hypoglycemic agent". Brazilian Journal of Medical and Biological Research, volume 36, issue 4, pp. 525–30. doi:10.1590/S0100-879X2003000400017
- ^ M. Motidome, M. E. Leekning, and O. R. Gottlieb (1970): "A química de Solanáceas brasileiras. 1 - A presenca de solamargina e de solasonina no juá e na lobeira." Anais da Academia Brasileira de Ciências, volume 42, supplement, pp. 375–76
- ^ Mariza A. Miranda, Lizandra G. Magalhaes, Renata F. J. Tiossi, Christian C. Kuehn, Luiz G. R. Oliveira, Vanderlei Rodrigues, James D. McChesney and Jairo K. Bastos (2012): "Evaluation of the schistosomicidal activity of the steroidal alkaloids from Solanum Lycocarpum fruits". Parasitology Research, volume 111, pp. 257–62. doi:10.1007/s00436-012-2827-8
- ^ Gilmarcio Z. Martins, Raquel R. D. Moreira, Cleopatra S. Planeta, Adélia E. Almeida, Jairo K. Bastos, Lígia Salgueiro, Carlos Cavaleiro, and Maria do Céu Sousa (2015): "Effects of the extract and glycoalkaloids of Solanum lycocarpum St. Hill on Giardia lamblia trophozoites" Pharmacognosy Magazine, volume 11, supplement 1, pp. S161–65. doi:10.4103/0973-1296.157721 PMID 26109762
- ^ Mariza A. Miranda, Renata F. J. Tiossi, Mariana R. da Silva, Kelly C. Rodrigues, Christian C. Kuehn, Luiz G. R. Oliveira, Sérgio Albuquerque, James D. McChesney, Claudio M. Lezama‐Davila, Angelica P. Isaac‐Marquez, and Jairo K. Bastos (2013): "In vitro Leishmanicidal and cytotoxic activities of the glycoalkaloids from Solanum lycocarpum (Solanaceae) fruits". Chemistry & Biodiversity, volume 10, issue 4, pp. 642–48.doi:10.1002/cbdv.201200063
- ^ L. C. Clementino, A. M. A. Velásquez, T. G. Passalacqua, L. Almeida, M. A. S. Graminha, G. Z. Martins, L. Salgueiro, C. Cavaleiro, M. C. Sousa, R. R. D. Moreira (2018): "In vitro activities of glycoalkaloids from the Solanum lycocarpum against Leishmania infantum". Revista Brasileira de Farmacognosia, volume 28, issue 6, pp. 673–77. doi:10.1016/j.bjp.2018.07.008
- ^ Melissa G. Morais, Guilherme A. F. da Costa, Álan A. Aleixo, Graziela T. de Oliveira, Lucas F. Alves, and Joaquim M. Duarte-Almeida (2015): "Antioxidant, antibacterial and cytotoxic potential of the ripe fruits of Solanum lycocarpum A. St. Hil. (Solanaceae)". Journal of Natural Product Research, volume 29, issue 5, pp. 480–83 doi:10.1080/14786419.2014.951930
- ^ Bicalho Silva and Viviane de Cassia (2015): "Larvicidal activity of oils, fatty acids, and methyl esters from ripe and unripe fruit of Solanum lycocarpum (Solanaceae) against the vector Culex quinquefasciatus (Diptera: Culicidae)". Rev. Soc. Bras. Med. Trop. 48(5): 610-613 doi:10.1590/0037-8682-0049-2015
PMID 26516974
- ^ M. A. Soares, L. P. Sánchez, J. B. Isaac Júnior, E. S. Pereira, E. M.s Pires, G. L. D. Leite, and J. C. Zanuncio (2019): "Solanum lycocarpum Saint Hilaire (Solanaceae) is host plant of Leucanella memusae (Walker) (Lepidoptera: Saturniidae: Hemileucinae) in Brazilian mountain grasslands". Florida Entomologist, volume 102, issue 3, pp. 624–26. doi:10.1653/024.102.0341
- ^ A. L. T. De Souza, G. W. Fernandes, J. E. C. Figueira, and M. O. Tanaka (1998): "Natural history of a gall-inducing weevil Collabismus clitellae (Coleoptera: Curculionidae) and some effects on its host plant Solanum lycocarpum (Solanaceae) in Southeastern Brazil". Annals of the Entomological Society of America, volume 91, issue 4, pp. 404–09. doi:10.1093/aesa/91.4.404
Solanum lycocarpum
View on GrokipediaTaxonomy
Classification
Solanum lycocarpum is classified within the kingdom Plantae, phylum Tracheophyta, class Magnoliopsida, order Solanales, family Solanaceae, genus Solanum, and species S. lycocarpum.[1][5] The species was first described by the French botanist Auguste de Saint-Hilaire in 1833, published in his work Voyage dans le District des Diamans.[1] Several heterotypic synonyms have been recognized for S. lycocarpum, including Solanum grandiflorum var. angustifolium Sendtn., Solanum grandiflorum f. apaense Chodat & Hassl., and Solanum grandiflorum var. macrocarpum Hassl..[1] As a member of the genus Solanum, S. lycocarpum is taxonomically related to economically important species such as the tomato (S. lycopersicum) and potato (S. tuberosum), sharing the same diverse genus known for its alkaloids and wide-ranging adaptations.[6]Etymology
The genus name Solanum is derived from the Latin word solamen, meaning "comfort" or "solace," referring to the sedative and medicinal properties attributed to various nightshade plants in ancient times.[7] The specific epithet lycocarpum is a Latinized form combining the Greek roots lykos (λύκος), meaning "wolf," and karpos (καρπός), meaning "fruit," alluding to the plant's ecological association with the maned wolf (Chrysocyon brachyurus).[3] In Portuguese, Solanum lycocarpum is commonly known as lobeira ("wolf's plant") or fruta-do-lobo ("wolf's fruit"), reflecting its association with the maned wolf. In English, it is referred to as "wolf apple," emphasizing the fruit's appeal to this canid.[3][8]Description
Morphology
Solanum lycocarpum is a deciduous, much-branched shrub or small tree typically reaching 1.5–5 m in height, with a roundish, sparse crown and crooked, cylindrical stems that are armed with uncinate prickles up to 0.8 cm long and covered in a dense indumentum of white, stellate trichomes.[9][3] The branches are thorny and exhibit a pioneer growth habit, contributing to the plant's overall robust structure.[3] The leaves are simple, ovate to elliptic or lanceolate-oblong, measuring 5–21 cm in length and 2–11 cm in width, with entire to slightly sinuate margins, an acute to acuminate apex, and a cordate or rounded base that may be asymmetric.[9] They are rigid and rough in texture, bearing dense white pubescence of stellate trichomes, particularly on the abaxial surface, while the adaxial surface is less densely tomentose; petioles are 1–7 cm long and often prickly.[9] Flowers are hermaphroditic and borne in extra-axillary or terminal scorpioid cymes containing up to 20 flowers, with short peduncles and pedicels about 0.3 cm long covered in stellate trichomes.[9] The corolla is rotate, 1–4 cm in diameter, and ranges from white to pale violet or purple, featuring five petals; the stamens are prominent, yellow, and attenuate, with anthers approximately 1.6 cm long.[9][3] The fruits are globose berries, 7–16 cm in diameter, initially green and pubescent, turning yellow to orange when ripe, weighing 400–900 g.[9][3][2] The pulp is fleshy, juicy, and sweet-tasting with a tomato-like flavor and strong aroma, enclosing 300–500 flattened, reniform seeds that are dark when mature.[3][10][2] These fruits facilitate seed dispersal primarily through consumption by wildlife.[10]Reproduction
Solanum lycocarpum displays an andromonoecious sexual system, producing both hermaphroditic and functionally staminate flowers on the same plant, with only hermaphroditic flowers capable of fruit production.[11] Flowering occurs year-round across its native range in the Brazilian Cerrado, but with peak intensity during the dry season, varying regionally from April to September in northeastern areas like Piauí to September through December in southeastern regions such as São Paulo.[12] Pollination is primarily achieved by large-bodied bees, including species in the genera Xylocopa, Epicharis, and Centris, which employ buzz pollination to extract pollen from the poricidal anthers of the flowers.[11] The plant is self-incompatible, as manual and spontaneous self-pollination yield no fruit set, promoting outcrossing for successful reproduction despite the potential for geitonogamy in andromonoecious individuals.[11] Following pollination, fruit development proceeds over approximately 2–3 months, resulting in large, globose berries that measure 7–16 cm in diameter and weigh 400–900 g, each containing 300–500 seeds.[12] These seeds, which are ellipsoid and albuminous with dimensions of about 6–7 mm in length, exhibit physical dormancy due to a rigid, dark-brown testa, and are primarily dispersed by mammals.[12] Seed viability is maintained for extended periods in the soil seed bank, with dormancy broken effectively by scarification or passage through animal digestive tracts, enhancing germination rates from around 40% in intact, undispersed seeds to over 90% in processed ones.[14] Optimal germination requires a 12-hour alternating light/dark cycle and fluctuating temperatures of 20/30°C, mimicking natural Cerrado conditions and promoting radicle emergence within 3–4 weeks under favorable circumstances.[14]Distribution and habitat
Geographic range
Solanum lycocarpum is native to central and southeastern Brazil, where it is primarily associated with the Cerrado biome, as well as southern Paraguay.[3][2] Within Brazil, the species occurs in the Northeast (Bahia), Central-West (Distrito Federal, Goiás, Mato Grosso, Mato Grosso do Sul), Southeast (Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo), and South (Paraná).[15] The plant typically grows at elevations between 600 and 1,200 meters above sea level, with populations documented up to 1,100 meters in savanna habitats.[3] Studies have observed variations in morphology and physiology across altitudinal gradients in the Neotropical savanna, confirming its presence in both low- and high-altitude areas within this range.[16] Historically, the range of Solanum lycocarpum has shown relative stability, but recent assessments indicate potential contraction due to ongoing habitat loss in the Cerrado biome, driven by agricultural expansion and deforestation; as of 2025, the Cerrado has lost approximately 46% of its native vegetation.[17] There are no records of widespread naturalized introductions outside South America, though limited ornamental plantings occur in subtropical areas.[3]Habitat preferences
Solanum lycocarpum thrives in the open savanna woodlands and rocky outcrops characteristic of the Brazilian Cerrado biome, where it often occupies disturbed or secondary formations such as pastures and regenerating areas.[18][3] This species is adapted to a seasonal climate with distinct wet and dry periods, enabling it to persist in environments with pronounced environmental variability.[3] The plant prefers well-drained soils ranging from sandy to loamy or even heavy clays, provided drainage is adequate to prevent waterlogging.[3] It tolerates slightly acidic to neutral soil pH levels (approximately 5.5–7.0) and nutrient-poor conditions typical of the highly weathered, dystrophic soils in the Cerrado.[18] In terms of climate, S. lycocarpum is suited to tropical savanna conditions with annual rainfall between 800 and 1,500 mm, concentrated in a wet season, and average temperatures ranging from 18°C to 30°C.[19][20] The species exhibits strong tolerance to drought, with established plants capable of surviving extended dry periods through adaptations like deep rooting.[3][18] Additionally, it shows resilience to frequent fires common in the Cerrado, which aids its role as a pioneer species in post-disturbance regeneration.[3] S. lycocarpum commonly associates with other Cerrado vegetation, including grasses, shrubs, and scattered trees, contributing to the mosaic of open woodlands where it reaches high densities in suitable microhabitats.[3]Ecology
Interactions with wildlife
_Solanum lycocarpum exhibits key mutualistic interactions with wildlife in the Brazilian Cerrado, primarily through seed dispersal facilitated by the maned wolf (Chrysocyon brachyurus), which serves as the main endozoochoric disperser. The plant's large, fleshy fruits, known as wolf apples, form a substantial part of the maned wolf's diet, comprising up to 50% of its fruit consumption in certain habitats and contributing significantly to overall biomass intake.[21][22] This relationship benefits the plant by enabling long-distance seed dispersal, with maned wolves depositing viable seeds across distances of several kilometers within their extensive home ranges averaging approximately 80 km².[23] A seminal study documented this dispersal mechanism, highlighting the maned wolf's role in transporting hundreds of seeds per fruit over wide areas.[24] Other wildlife consumers, including rodents, small mammals, and birds, occasionally ingest the fruits and contribute to dispersal via endozoochory, though their impact is secondary to that of the maned wolf.[24][25] These interactions are particularly vital during the dry season, when S. lycocarpum fruits provide essential nutrition to frugivores amid resource scarcity.[26] The plant also maintains mutualistic ties with pollinators, attracting bees such as Xylocopa species that perform buzz pollination to ensure cross-pollination and fruit set.[27][28] High fruit production by S. lycocarpum, which reaches dense populations in disturbed Cerrado areas, bolsters local biodiversity by sustaining frugivore populations and promoting plant regeneration.[29] However, the fruits contain glycoalkaloids like solasonine and solamargine, which exhibit toxicity and may deter or harm non-adapted species while being tolerated by primary consumers like the maned wolf.[30][31]Pests and diseases
Solanum lycocarpum faces several insect pests that affect its leaves, fruits, and overall growth in its native Cerrado habitat. Aphids (Hemiptera: Aphididae) are common sap-suckers on the plant, often tended by ants in mutualistic associations that can exacerbate damage by increasing aphid populations and reducing plant fitness through honeydew production and sooty mold formation.[32] Leaf miners (Diptera: Agromyzidae) create serpentine trails in the foliage, leading to reduced photosynthetic capacity; studies show that plants with lower fluctuating asymmetry experience less mining damage, indicating a link between plant vigor and pest susceptibility.[33] Fruit borers, such as the small fruit borer Neoleucinodes elegantalis (Lepidoptera: Crambidae), infest developing fruits, causing larval galleries that result in premature fruit drop and seed loss.[34] Additionally, larvae of the moth Leucanella memusae (Lepidoptera: Saturniidae) feed on leaves and can induce dermatitis in handlers due to urticating setae, posing secondary risks during harvesting.[35] Fungal diseases primarily threaten S. lycocarpum during periods of high humidity. Anthracnose, caused by Colletotrichum spp., is prevalent on seeds and fruits in wet seasons, leading to dark lesions, rot, and reduced viability; incidence can reach 29% on untreated seeds, though surface sterilization significantly lowers it.[36] Other seed-associated fungi like Aspergillus spp., Penicillium spp., and Cladosporium spp. contribute to storage decay but have lesser phytopathological impacts.[36] Viral infections, such as potato virus Y (PVY; Potyviridae), cause mosaic symptoms on leaves but are rare, with isolated reports from Minas Gerais state.[37] Vertebrate herbivores exert pressure on S. lycocarpum, particularly in disturbed Cerrado areas. Rodents, including species like Nectomys squamipes, inflict significant pre-dispersal seed predation and fruit damage, limiting recruitment.[38] In fragmented landscapes with reduced forage options, overbrowsing by goats and cattle occurs, stripping leaves and young stems despite the plant's toxicity from alkaloids, leading to stunted growth in invaded pastures.[39] The plant exhibits natural resistance to pests through its dense tomentose pubescence on leaves and stems, which physically deters small arthropods and reduces oviposition sites, and via steroidal alkaloids like solamargine and solasonine that act as feeding inhibitors and toxins against herbivores.[3][2] Chemical controls are rarely applied due to the species' predominant wild harvesting for food and medicine, favoring integrated management reliant on habitat preservation over pesticides. A 2012 study along urban gradients found higher herbivory levels on S. lycocarpum, with up to 18.4% leaf area removed in highly urbanized sites compared to 10.9% in less urbanized sites, due to disrupted predator-prey dynamics and increased edge effects.[40]Uses
Culinary applications
The ripe fruits of Solanum lycocarpum, known locally as fruta-do-lobo or lobeira, are consumed fresh by populations in the Brazilian Cerrado region due to their sweet, fleshy pulp and low acidity.[41] These yellow berries, reaching 7–16 cm in diameter, offer a tomato-like texture when eaten raw, providing a nutritious snack valued for its mild flavor.[42][2] Beyond fresh consumption, the fruits are processed into jams, juices, liqueurs, and candies, integrating them into traditional Brazilian Cerrado cuisine for both everyday and festive preparations.[41] Preparation methods often involve cooking or processing to mitigate any mild bitterness present in the pulp, enhancing palatability for desserts and beverages.[3] In regional recipes, the fruits are boiled or fermented to create liqueurs and syrups, or pulped and strained for juices and ice creams, reflecting their role in Cerrado culinary traditions.[41] The starch extracted from the fruits, yielding about 10% by weight, is also used in local sweets and as a thickening agent, obtained by peeling, pulping, and drying the ripe berries.[42] Nutritionally, S. lycocarpum fruits are rich in vitamin C, delivering over 100% of the recommended daily intake in a 100 g serving of fresh pulp, alongside notable levels of fiber at approximately 23 g per 100 g in flour form.[2][43] They contain about 30% resistant starch in the fruit, which resists digestion and functions as a prebiotic to support gut health by promoting beneficial bacteria growth.[44] These components contribute to the fruit's appeal as a dietary staple in the Cerrado, offering soluble sugars and minerals like phosphorus for energy and metabolic support.[45] Historically, indigenous groups in central Brazil gathered S. lycocarpum from the wild as a fruit source, relying on its drought-resistant nature for sustenance during dry periods when other resources were scarce.[3] The plant's adaptability to arid environments made its fruits a reliable food source for native communities, harvested wild or from managed stands to supplement diets.[2] Safety considerations emphasize consuming only ripe fruits, as unripe ones contain high levels of glycoalkaloids like solamargine and solasonine, which can cause gastrointestinal distress if ingested raw.[46] Processing through ripening, cooking, or extraction reduces these compounds, rendering the fruits safe for culinary use in moderation.[3]Medicinal properties
In Brazilian folk medicine, Solanum lycocarpum, commonly known as lobeira or fruta-do-lobo, is traditionally employed for treating diabetes, hypertension, and gastrointestinal issues such as abdominal pain, with fruits and roots prepared as remedies to manage hyperglycemia and digestive discomfort.[47][48] The plant's hypoglycemic properties are particularly noted, where unripe fruit starch is used to control blood sugar levels in diabetic patients.[49] Key active compounds in S. lycocarpum include steroidal glycoalkaloids such as solamargine and solasonine, which constitute significant portions of the fruit's alkaloid content (up to 47.96% and 45.09%, respectively), alongside withanolides, other steroidal alkaloids like solasodine, and phenolic antioxidants including caffeic and coumaric acids.[2] These compounds contribute to the plant's pharmacological effects, with the glycoalkaloids exhibiting potent bioactivity in extracts.[50] Scientific studies support these traditional applications, particularly the hypoglycemic effects of fruit extracts, which reduce serum glucose levels in animal models at doses of 25–100 mg/kg body weight and inhibit α-glucosidase activity (IC₅₀: 49.06 µg/mL for calystegine-rich fractions).[2] Anti-inflammatory properties have been evidenced in leaf extracts, demonstrating reduced inflammation in vivo at 300 mg/kg body weight, as confirmed by 2020s research including antinociceptive assays.[51] Additionally, 2020s investigations reveal the prebiotic potential of the fruit's resistant starch (approximately 30% content), which promotes probiotic bacterial growth and supports gut health, though its protective effects against induced intestinal inflammation are inconsistent.[52][53] Traditional preparations involve decoctions or infusions of fruits and roots, or powdered forms consumed at dosages of 5–10 g daily for hypoglycemic and gastrointestinal relief.[54] However, due to the potential toxicity of alkaloids, high doses may induce cytotoxicity and genotoxicity, and the plant is not recommended for pregnant individuals owing to embryotoxic and fetotoxic effects observed in rat studies at dietary levels of 3%.[2][55][56]Other uses
The wood of Solanum lycocarpum is light and soft, with poor mechanical properties, rendering it unsuitable for heavy construction but appropriate for local utilitarian purposes such as fuel and charcoal production. It is also employed in crafting inexpensive packing boxes due to its straight grain and medium texture.[3] As an ornamental plant, S. lycocarpum is valued in landscape architecture within the Brazilian Cerrado region for its vibrant purple flowers, star-shaped structure, and attractive orange-yellow fruits, which provide visual appeal in gardens and public spaces. Its native adaptation to drought-prone savanna environments contributes to its suitability for low-maintenance ornamental plantings.[57][58] Ecologically, S. lycocarpum serves as a pioneer species in the restoration of degraded Cerrado woodlands, rapidly colonizing disturbed areas like abandoned pastures and facilitating the establishment of other native vegetation through its nurse plant effects, which create favorable microenvironments under its canopy. This role supports reforestation efforts in savanna ecosystems recovering from agricultural or fire impacts.[3][59][60] The plant is primarily wild-harvested from natural Cerrado populations for these applications, with limited commercial-scale cultivation as of 2025, reflecting its abundance in native habitats but constrained market development for non-food uses.[3][42]Cultivation
Growing requirements
Solanum lycocarpum thrives in full sun conditions, requiring at least 6-8 hours of direct sunlight daily to support vigorous growth and fruit production.[61][3] Insufficient light can lead to leggy growth and reduced fruiting. The plant is well-suited to tropical and subtropical climates, with optimal temperatures ranging from 20 to 30°C; as a tropical species, it prefers warm conditions and may be damaged by frost, though specific tolerance levels for mature plants are not well-documented.[18][3] For soil, well-drained sandy loam or similar textures are preferred, accommodating a wide range including poor, acidic types while avoiding waterlogging to prevent root rot.[3][62] The plant tolerates acidic, nutrient-poor soils typical of the Cerrado (pH 4.5-6.0), though well-drained conditions are essential.[18] Watering should be regular during establishment to maintain even moisture, though mature plants exhibit strong drought tolerance once rooted; aim for soil drying slightly between sessions.[3][62] The plant grows well in the moderate humidity of its native savanna habitat.[3] Fertilization involves applying a balanced, low-nitrogen NPK formula during active growth periods to avoid excessive vegetative development at the expense of fruiting. In cultivation, challenges include vigilant pest management, as the plant can attract common Solanaceae pests like aphids or beetles, and ensuring spacing of 3-6 meters between individuals to accommodate its shrubby habit up to 5 meters tall.[35][3]Propagation methods
Solanum lycocarpum is primarily propagated through seeds, which require specific treatments to overcome dormancy imposed by the endosperm cap. Seeds are extracted from ripe, soft fruits by transversally cutting the fruit and washing away the surrounding pulp to remove the fleshy coating, followed by surface sterilization with 1% sodium hypochlorite and drying.[18] Optimal germination occurs under a 12-hour alternating light/dark regime with fluctuating temperatures of 20/30 °C, yielding up to 91% germination for seeds dispersed from ripe fruits after approximately 40 days, with radicle emergence beginning around day 6 and 50% germination by day 26.[18] Scarification by mechanical removal of the endosperm cap enhances this process, achieving 100% germination within 5 days at constant temperatures between 20–30 °C.[18] To further improve germination rates and uniformity, hydropriming—imbibing seeds in aerated water at 15 °C for 15 days—results in 87.9% germination, a 23% increase over non-primed controls, while reducing the time to 50% germination by about 14 days.[63] This priming method also promotes endosperm weakening via increased endo-β-mannanase activity and supports better seedling establishment, with primed seedlings showing 23% greater shoot length, 24% faster root collar diameter growth, and higher dry weights (e.g., 1.14 g shoot dry weight versus 0.81 g in controls) after 90 days in tube or bag systems.[63] Sowing is best timed for the wet season to mimic natural conditions in the Cerrado ecoregion, where alternating temperatures and moisture facilitate the two-stage endosperm weakening process observed in wild germination.[18] Vegetative propagation methods, including semi-hardwood cuttings, layering, and grafting onto related Solanum rootstocks for enhanced disease resistance, offer alternatives to seed propagation, though detailed success rates for S. lycocarpum remain understudied. Semi-hardwood cuttings from healthy plants can be rooted in a sand-perlite mixture under intermittent mist, achieving moderate success similar to other Solanum species, while layering exploits the plant's woody stems for natural rooting. Grafting is particularly useful for introducing resistance traits from compatible rootstocks like S. torvum. Transplanting occurs after 6–12 months, once seedlings reach 30–50 cm in height. Plants propagated from seed typically begin fruiting in 2–3 years under suitable cultivation conditions.References
- https://www.[researchgate](/page/ResearchGate).net/publication/283322828_Seed_dispersal_of_Solanum_lycocarpum_StHil_Solanaceae_by_the_Maned_Wolf_Chrysocyon_Brachyurus_Mammalia_Canidae