Genetic survey of 10 Indian coconut landraces by simple sequence repeats (SSRs) |
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| Authors: | MK Rajesh V Arunachalam P Nagarajan P Lebrun K Samsudeen C Thamban |
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| Institution: | 1. Division of Crop Improvement, Central Plantation Crops Research Institute, Kasaragod 671124, Kerala, India;2. Department of Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore 641004, TN, India;3. Centre International de Recherches en Agronomie pour le Développement, Avenue Agropolis, TA 80/03, 34398 Montpellier Cedex 5, France;4. Division of Social Sciences, Central Plantation Crops Research Institute, Kasaragod 671124, Kerala, India |
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| Abstract: | A rich genetic diversity of coconut exists in farmer's fields, which represent valuable genetic resource for breeding. The study was conducted to assess the pattern of diversity in 102 coconut palms representing 10 landraces from 3 coconut-growing communities of India using 14 simple sequence repeat (SSR) markers. A total of 90 alleles were detected with an average of 6.42 alleles per locus and an average polymorphism information content of 0.61. Expected heterozygosity (He) was highest for the two tall landraces from Pallikkara community, while the least heterozygosity was observed for the dwarf coconut landraces from Vayalar community. Mean fixation index (FST) of 0.42 indicates a high level of population differentiation. A low gene flow (Nm) of 0.37 was observed. Based on molecular data, genetic similarities were calculated. The unweighted pair group method with arithmetic averages (UPGMA) cluster analysis grouped the landraces according to their geographical locations and breeding behaviour. The practical implications of this study in farmer participatory evaluation and conservation of coconut genetic resources are highlighted. |
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| Keywords: | Coconut Diversity Landraces SSR |
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