Development and chacterization of genomic microsatellite markers in rhdodendron arboreum
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Date
2014
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Central University of Punjab
Abstract
Rhododendron arboreum, a key species inhabiting Indian Himalayas, has ecological and economic importance. Global climate change and anthropogenic activities can pose a threat to the biodiversity richness. Population genetics characteristics are the fundamentals of conservation and management practices. However, no genetic background for the species is presently available. To provide an insight into the population structure of the species, an effective marker resource was developed. A genomic library enriched for microsatellites was constructed using biotin- streptavidin hybridization technique, followed by sequencing of positive clones. With 54% enrichment rate, 41 primers were designed from SSR clones, consisting of perfect or interrupted repeats of AG/CT, AC/GT motifs. 38 loci showed successful amplification on genotypes of three populations with number of alleles ranging from 2 to 14, observed and expected heterozygosity of 0.167 to 0.933 and 0.422 to 0.917, respectively and average polymorphic information content of 0.104 to 0.811. A high gene flow (Nm= 5.436) demonstrated high genetic diversity within the populations. 19 loci displayed significant deviations from Hardy Weinberg equilibrium. Overall no linkage disequilibrium and bottleneck was detected among sampled populations. DARwin and STRUCTURE analysis grouped the populations into two original clusters and admixed genetic stock irrespective of their geographical locations. These novel loci will support further genotyping studies in R. arboreum.
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Keywords
Rhododendron arboreum, Microsatellites, Selective hybridization, SSR characterization, Population structure
Citation
Choudhary, Shruti (2014) Development and chacterization of genomic microsatellite markers in rhdodendron arboreum.