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Analysis of Genetic Diversity in Poeciloneuron pauciflorum Bedd.―An Endemic Tree Species from the Western Ghats of India

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Author(s): Padmesh Pandaram Pillai | Jayakumari Sanakan Sajan | Kuttapetty Manikantan Menon | Achuthan Sudarshanan Hemanthakumar | Alagramam Govindasamy Pandurangan | Peringatulli Narayanan Krishnan | Soorimuthu Seeni

Journal: American Journal of Plant Sciences
ISSN 2158-2742

Volume: 02;
Issue: 03;
Start page: 416;
Date: 2011;
Original page

Keywords: RAPD | Neoendemism | Xanthones

ABSTRACT
Poeciloneuron pauciflorum is a narrow endemic having highly restricted distribution in the southern-western Ghats region of India. 18 accessions of P. pauciflorum collected from four different locations were analyzed for genetic varia-tion using 20 random primers. Out of 141 amplicons generated, 130 of them were polymorphic (92.20% polymorphism). Contrary to the general concept of low genetic variation associated with endemic plant species, P. pauciflorum exhibits high genetic diversity as the similarity index value based on Nei & Li’s similarity coefficient ranges from 0.36 to 0.95 with mean GS = 0.72 and Shannon’s information measure (0.43). Cluster analysis showed grouping of all accessions from the State of Tamil Nadu into two major clusters with few outliers while those from the State of Kerala also clus-tered with them. Accessions from Kalliankadu forest segment harbors maximum diversity as indicated by various ge-netic diversity indices like h, I, Ht, Hs, Gst, PL and hence this site is recommended for in situ conservation of this nar-row endemic. The main factors responsible for the high level of genetic diversity among accessions are probably re-lated to the reproductive isolation and ecological breadth. The strong genetic variability among accessions indicates that the management for the conservation of the genetic diversity in P. pauciflorum should aim to preserve every acces-sion. The present study assumes significance as it negotiates endemism and genetic variation in tree species, a global phenomenon having wide implications in species diversity and conservation.
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