Skip to main content

Wild banana in mainland Southeast Asia reveal hidden diversity and need to conserve natural genetics

Wild banana in mainland Southeast Asia reveal hidden diversity and need to conserve natural genetics

NEWS - There are many Musa L. species in the natural diversification area of Southeast Asia, but the actual number is still debated because the botanical characterization, distribution and intraspecific variability are still poorly known which endangers the conservation and exploitation as wild relatives of cultivated forms.

To address the unexplored Musa diversity in mainland Southeast Asia, researchers examined 208 specimens collected in Vietnam, Laos and China which mostly belong to Musa balbisiana, Musa itinerans, Musa acuminata and Musa yunnanensis.

Mainland Southeast Asia as the main center of diversification for the Musa section shows a very contrasting distribution. M. yunnanensis is localized in the specific ecology of the Yunnan plateau, while Musa acuminata is only endemic to the Burmannica complex in upper Laos but has occasionally been transported over long distances.

M. itinerans has a strong presence with a much wider distribution throughout Southeast Asia. M. balbisiana has an even wider distribution and is now found in all areas with a benign ecology, thus posing a challenge in distinguishing spontaneous from wild forms.

Genomic characterization shows intraspecific diversity in all species that does not seem to correlate with morphological diversity, except in the case of M. yunnanensis. Interestingly, these genomic data have shown the existence of hybrid forms between M. acuminata and M. yunnanensis.

The hybridization was spontaneous between wild species or without human intervention which has not been documented before. The hybridization proves the possibility of spontaneous interspecific hybridization inferred for the early phase of domestication of cultivated banana.

Intraspecific genetic diversity has revealed a distinct diversity structure in internal variability and heterozygosity levels. This structure is also geographically organized, at least for M. balbisiana and M. itinerans, more related to human factors than to environmental constraints.

The exploitation of natural populations by local people has had an impact on species diversity. Uses other than fruit consumption were certainly the main drivers in the early stages of Musa domestication, as they probably were for other important crop species.

M. yunnanensis is a typical wild form, but it is already used as animal feed. M. acuminata subsp. burmannica is also always found in the wild. Geographical distribution is still limited, but sporadic distribution sites may be related to human movement.

M. itinerans which has a wide distribution is not cultivated, but is subjected to intense human exploitation of natural populations with minimal agricultural practices such as transplantation and possible selection for certain traits.

M. balbisiana is at the most advanced stage of the process. This species can be considered to have been domesticated due to its various uses resulting in a very wide distribution and diversity that is strongly influenced by human activities.

These findings lead to a reconsideration of the boundaries between the concepts of wild, cultivated and domesticated bananas by referring to the concept of ‘wild cultivation’ and defined as wild plants that are cultivated and translocated by humans.

Original research

Jenny C, Sachter-Smith G, Breton C, Rivallan R, Jacquemoud-Collet J-P, Dubois C, et al. (2024). Musa species in mainland Southeast Asia: From wild to domesticate. PLoS ONE 19(10): e0307592, DOI:10.1371/journal.pone.0307592

Dlium theDlium
Labels:

Popular Posts

Liverwort (Marchantia)

Liverwort ( Marchantia ) is a genus of plants in the Marchantiaceae, growing vines and attached to the soil surface, soft, dark green, upright phallus like a cup, grows in colonies on slopes and vertical soil that is moist and shady. Marchantia has elongated strands, rounded ends, branched, flat margins and a black vein in the middle. The strands formed a circular formation, growing widely and forming new formations around it. Sexual reproduction involves sperm from antheridia in male plants to fertilize ova in archegonia in female plants. The zygote develops into a small sporophyte which remains attached to the larger gametophyte. The sporophyte produces spores which develop into free-living male and female gametophytes. Asexual reproduction via gemmae in the cup-like structures on the upper surface of the plant. Asexual reproduction can also occur when older plant parts die and new, surviving branches develop into separate plants. Kingdom: Plantae Phylum: Marchantiophyta Class: ...
Read more

Black potato (Coleus rotundifolius)

Black potato ( Coleus rotundifolius ) is a species of plant in Lamiaceae, herbaceous, fibrous roots and tubers, erect and slightly creeping stems, quadrangular, thick, and slightly odorous. Single leaves, thick, membranous, opposite and alternate. Leaves are oval, dark green and shiny on the upper side, bright green on the lower side. Up to 5 cm long, up to 4 cm wide, slightly hairy and pinnate leaf veins. Leaf stalks up to 4 cm long. Small, purple flowers. Star-shaped petals, lip-shaped crown, dark to light purple with a slightly curved tube shape. Flowering from February-August. Small tubers, brown and white flesh and tuber length 2-4 cm. Kingdom: Plantae Phylum: Tracheophyta Subphylum: Angiospermae Class: Magnoliopsida Order: Lamiales Family: Lamiaceae Subfamily: Nepetoideae Tribe: Ocimeae Subtribe: Plectranthinae Genus: Coleus Species: Coleus rotundifolius
Read more

Wild durian (Cullenia exarillata)

Wild durian ( Cullenia exarillata ) is a species of plant in the Malvaceae, a tall tree with smooth, greyish-white bark, peeling on older trees, a straight trunk, horizontal branches and often with a series of knob-like tubercles for flower and fruit attachment. C. exarillata has young branches and the underside of the leaves is covered with golden brown peltate or shield-like scales. The leaves are single, alternate, glabrous, glossy green on the upper side and covered with silvery or orange peltate scales on the underside. Hermaphroditic flowers are tubular and also covered with golden brown scales, 4-5 cm long and cream or reddish brown in color. Flowers have no petals, formed of tubular bracteoles and tubular calyxes, 5-lobed. Fruit is round, 10-13 cm in diameter, covered with thorns and clustered along the branches. Many seeds, reddish brown, 4-5 cm long and 2-3 cm wide. The seeds are enclosed by a fleshy, whitish aril. The fruit splits open when ripe and dries to release the s...
Read more