Genetic diversity analysis in greater yam (Dioscorea alata L.) native to India using morphological and molecular markers.

Sheela M.N., Abhilash P.V., Asha K.I., Arnau Gemma. 2016. Genetic diversity analysis in greater yam (Dioscorea alata L.) native to India using morphological and molecular markers.. In : XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Root and Tuber Crops: Sustaining Lives and Livelihoods into the Future. Schultheis J.R. (ed.). Louvain : ISHS, 51-57. (Acta Horticulturae : ISHS, 1118) ISBN 978-94-62611-14-6 International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Root and Tuber Crops: Sustaining Lives and Livelihoods into the Future. 29, Brisbane, Australie, 17 Août 2014/22 Août 2014.

https://doi.org/10.17660/ActaHortic.2016.1118.8

Communication avec actes

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
ID581164.pdf
Télécharger (2MB) | Demander une copie

Résumé : India holds a rich genetic diversity of yams and the occurrence of about fifty different Dioscorea species was reported, largely in the west, east and northeastern regions. Among the Dioscorea species, greater yam (Dioscorea alata L.) is the most important species grown throughout India. The National Repository on Tuber Crops Germplasm at Central Tuber Crops Research Institute, India conserves 431 accessions of greater yam as field gene bank. Wide variability for tuber shape, flesh colour, plant architecture and other morphological, biochemical and agronomic traits were recorded among accessions in the field gene bank. In the present study, morphological and molecular characterization was carried out in greater yam accessions collected from 14 states representing the major yam growing regions in India. A total of 48 morphological traits were recorded using International Plant Genetic Resources Institute (IPGRI) descriptors. Ten microsatellite markers were screened and seven polymorphic markers were used for molecular characterization. The results showed the divergence of the genotypes between southern states adjoining Western Ghats and north eastern states that form the two hot spots of biodiversity. Several triploids with high dry matter content (>35%) and compact tuber shape were isolated. This paper depicts the wide spectrum of variation present in greater yam native to India and its use in developing hybrids with value added traits.

Mots-clés libres : Dioscorea alata, Diversity, India, Morphological, Molecular markers

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale
F50 - Anatomie et morphologie des plantes

Auteurs et affiliations