Genetic differentiation and diversity of Adansonia digitata L (baobab) in Malawi using microsatellite markers

Show simple item record Munthali, C.R.Y. Chirwa, Paxie W. Changadeya, W.J. Akinnifesi, Festus K. 2012-10-22T06:49:12Z 2012-10-22T06:49:12Z 2013-02
dc.description.abstract Baobab (Adansonia digitata L) belonging to Bombacaceae family, is one of the most widely used indigenous priority tree species in sub-Saharan Africa, valued in the cosmetic industry for its seed oil, and powdery fruit pulp for juice making. Baobab has high potential for domestication in southern Africa, therefore understanding its genetic diversity and population structuring is warranted. The study investigated the level of genetic diversity and differentiation of five populations of A. digitata L. sampled from four diverse silvicultural zones in Malawi. Variation at nine microsatellite loci were examined in 150 individual trees. Low mean genetic diversity was expressed through genetic diversity indices: Nei’s genetic diversity (h, 0.18 ± 0.03), Shannon Information Index (I, 0.21 ± 0.07), observed number of alleles (na, 1.47 ± 0.10), effective number of alleles (na, 1.23 ± 0.04) and percentage polymorphic loci (pp, 48%). The low genetic variation found is attributed to the population growing in marginal areas of genetic centre of diversity of the species, anthropogenic factors and founder effects. Moderate genetic differentiation was observed among populations (Gst = 0.13) indicating the presence of a large number of common alleles resulting in a homogenisation effect. Clustering of individual trees by genetic similarity coefficients indicated that mainland trees were genetically closer than the trees on Likoma Island. Mantel’s test showed a weak positive insignificant correlation (Z = 0.12; P = 0.64) between genetic distance among populations and actual distance on the ground implying that geneflow was not directly influenced by isolation by distance. The results suggest that seed distribution and tree improvement should recognise the presence of ecotypes and conservation measures should protect all the populations due to existence of private alleles which are of adaptive importance. en_US
dc.description.sponsorship Mzuzu University and Stellenbosch University. en_US
dc.description.uri en_US
dc.identifier.citation Munthali, CRY, Chirwa, PW, Changadeya, WJ & Akinnifesi FK 2013, 'Genetic differentiation and diversity of Adansonia digitata L (baobab) in Malawi using microsatellite markers', Agroforestry Systems, vol. 87, no. 1, pp. 117-130. en_US
dc.identifier.issn 0167-4366 (print)
dc.identifier.issn 1572-9680 (online)
dc.identifier.other 10.1007/s10457-012-9528-2
dc.language.iso en en_US
dc.publisher Springer en_US
dc.rights © Springer Science+Business Media B.V. 2012. The original publication is available at en_US
dc.subject Baobab (Adansonia digitata) en_US
dc.subject Race en_US
dc.subject Polymorphism en_US
dc.subject Provenance en_US
dc.subject Genetic diversity en_US
dc.title Genetic differentiation and diversity of Adansonia digitata L (baobab) in Malawi using microsatellite markers en_US
dc.type Postprint Article en_US

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