, Volume 48, Issue 5, pp 459-465

Genetic diversity of Curcuma alismatifolia Gagnep.(Zingiberaceae) in Thailand as revealed by allozymepolymorphism

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Abstract

Allozyme polymorphism at seven loci (TPI, G6PD-2,IDH-1, SKD-2, MDH-1, GOT-1, andGOT-2) was employed to detect the level of geneticdiversity in C.alismatifolia populations from both cultivatedand wild habitats in Thailand. High diversity was observed in allpopulations with relatively lower values in cultivated populations.Percentage of polymorphic loci (P)varied from 85.7–100% in cultivated populations comparedwith 100% in all natural populations. Allele number per locus(A L) was 3.14 in cultivatedpopulations, and from 2.86–4 in natural populations. Allelenumber per polymorphic locus(A P) of cultivated andnatural populations ranged from 3.14–3.5 and 2.86–4,respectively. Genetic diversity within populations(H S) varied from0.586–0.611 in cultivated and from 0.621–0.653 in naturalpopulations. The genetic identity(I SP) for the species was0.833. The cultivated populations yielded higher value of geneticidentity with highland populations(I C /H =0.776) than with the lowland ones(I C /L =0.754). The analysis of genetic similarities with theNeighbor-Joining algorithm results in the separation ofcultivated populations from all wild populations. One highlandpopulation from the tourist spot, H2, was placed in a separatecluster between the cultivated and other wild populations. It isconsidered as the possible origin of the cultivatedpopulations.