MAPPING GENETIC DIVERSITY OF Saraca asoca (Roxb.) W. J. de Wilde (Fabaceae)
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Date
2013-07-27
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Mapping the distribution of a species and identifying populations
for 'in-situ' conservation is considered as the primary step in any species
conservation. For 'in-situ' conservation, the population must be large and
contiguous, with high density per unit area, regeneration high genetic
diversity and high fitness. With invention of new tools and techniques of
mapping, now it's easy to identify the populations for 'in-situ'
conservation. One such tool is 'Ecological Niche Modelling' (ENM), which
helps identifying the most suitable habitats for species conservation
based on known points of occurrences. In this study we have attempted
to identify populations of Saraca asoca (Roxb.) W. J. de Wilde, for 'in-situ'
conservation along Western Ghats.
As a first step, we developed niche map for Saraca asoca with the
help of DIVA-GIS, an ENM tool. We studied the populations from
different areas of varying suitability for their fitness measures such as
regeneration, density, girth, height, fluctuating leaf asymmetry and
specific leaf weight along with genetic diversity. The results from this
study validated the assumption that the populations growing in higher
suitability areas possessed higher fitness and high genetic diversity than
the populations growing in least suitable areas. Based on the results we
have been able to identify the 'Sink’ populations for creating 'Forest gene
banks' an 'in-situ' conservation strategy. The 'Donor' populations to
contribute complementary genes to ‘Sink’ were also identified.
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Keywords
diseases, fungi, chickpeas, biological development, planting, biological phenomena, genotypes, extraction, irrigation, pathogens