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      https://www.ias.ac.in/article/fulltext/jgen/080/03/0141-0148

    • Keywords

       

      Oryza malampuzhaensis ; genetic diversity; population structure; RAPD

    • Abstract

       

      Oryza malampuzhaensis Krish.et Chand. (2n = 4x = 48; Poaceae,Oryza) is endemic to Western Ghats, South India, and shows a highly localized distribution over a small geographical area in this region. This is the most poorly understood taxon in genusOryza and is often misidentified asO. officinalis owing to their close morphology. We assessed the nature and distribution of genetic variation among 11 populations ofO. malampuzhaensis using random amplified polymorphic DNA markers. The analysis revealed low genetic variation inO. malampuzhaensis. Cluster analysis of pairwise genetic distances of populations revealed three distinct clusters and the grouping of populations largely corresponded to their geographical proximity. Restricted gene flow and a geography-dependent differentiation were evident among populations. The altitude-influenced differences in ecological factors among the natural habitats of the populations seem to be the cause of the geography-dependent differentiation. Genetically isolated smaller populations and a narrow genetic base inO. malampuzhaensis point to its vulnerability to genetic drift and genetic depauperation. ThusO. malampuzhaensis appears to be under the threat of extinction and needs to be conserved by use of suitable methods. The present study also identified molecular markers diagnostic forO. malampuzhaensis.

    • Author Affiliations

       

      George Thomas1 Sreejayan1 Latha Joseph2 Philomena Kuriachan2

      1. Plant Genomics Group, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram - 695 014, India
      2. Department of Botany, University of Kerala, Thiruvananthapuram - 695 581, India
    • Dates

       
  • Journal of Genetics | News

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