Intraspecific genetic variability,differentiation and evolutionary relationships revealed through microsatellite loci in seven economically important Calamus species  

作　　者：Binoy Kurian A.S.Hemanthakumar Joemon Jacob Wickneswari Ratnam C.Y.Choong Prabalee Sarmah S.Shefeek Vishnu V.Nair S.V.Sajithkumar K.K.Sabu 

机构地区：[1]Jawaharlal Nehru Tropical Botanic Garden and Research Institute(JNTBGRI),Palode,Thiruvananthapuram,Kerala 695562,India [2]Universiti Kebangsaan Malaysia,43600 Bangi,Selangor,Malaysia [3]Assam Agricultural University,Jorhat,Assam 785013,India

出　　处：《Journal of Forestry Research》2020年第5期1899-1911,共13页林业研究（英文版）

基　　金：The work was supported by the Department of Biotechnology,Government of India(Order No.BT/156/NE/TBP/2011);the Kerala State Council for Science,Technology and Environment(KSCSTE),Thiruvananthapuram(Order No.234/KBC/2012/KSCSTE).

摘　　要：Population density,species richness and critical population parameters are crucial in determining the levels of gene diversity in dioecious species of the genus Calamus.The extent of intraspecific and intrageneric genetic variability in Calamus from the southern Western Ghats of India was studied using 26 microsatellite markers by sampling 227 individuals belonging to seven economically important species.The heterozygosity of microsatellite loci ranged from zero to 0.78.Average gene diversity within species was 0.13;in all species it was 0.18 and amongst species was 0.06.The Shannon Information Index was the lowest for Calamus metzianus(0.11),whereas it ranged from 0.16 to 0.26 for other species.The expected heterozygosity varied from 0.08 to 0.18.Calamus hookerianus and Calamu travancoricus showed the highest genetic differentiation(44%)revealed through Fst values,whereas the lowest(22%)was observed between Calamus gamblei and Calamu thwaitesii.Population structuring and phylogenetic analysis differentiated the seven species.Due to overexploitation and loss of rare alleles,small populations could lead to fertilization between closely related individuals,resulting in inbreeding and increasing the risk of extinction.This could be important for species such as C.metzianus where allelic polymorphism was 23%,whereas for all other species it was 38%to 46%.Genetic diversity“micro-hotspots”were identified from the protected area network of the southern and central Western Ghats with highest observed heterozygosity.Four microhotspots from the Agasthyamalai Biosphere Reserve and the Pushpagiri Wildlife Sanctuary may be possible for long-term conservation programs.The findings of this study lay a strong foundation for strengthening protected area networks,especially areas with intermediate levels of disturbance.

关 键 词：Genetic diversity DIFFERENTIATION Population structure Conservation Microsatellites Calamus spp 

分 类 号：Q943.2[生物学—植物学]