A study of genetic diversity among Indian bread wheat (Triticum aestivum L.) cultivars released during last 100 years

Mir, R R and Kumar, J and Balyan , H S and Gupta, P K (2012) A study of genetic diversity among Indian bread wheat (Triticum aestivum L.) cultivars released during last 100 years. Genetic Resources and Crop Evolution, 59 (5). pp. 717-726. ISSN 1573-5109

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Abstract

Genetic diversity was examined in a collection of 263 Indian bread wheat (Triticum aestivum L.) cultivars using 90 SSR markers. These cultivars were classified into Group I (pre-green revolution cultivars) and Group II cultivars (post-green revolution cultivars). SSR markers were also classified into Set-I SSRs (42 random genomic SSRs) and Set-II SSRs (48 SSRs associated with QTLs for grain weight). The SSRs belonging to Set-II exhibited relatively low level of polymorphism, suggesting that the SSRs associated with QTL for grain weight in wheat were probably under selection pressure during wheat breeding. AMOVA indicated that proportion of the variation within each of the two groups of cultivars accounted for most (87.59%) of the molecular variance, while the variation between the two groups of cultivars accounted for only 12.41% of the variance. The estimates of the average number of alleles/locus and gene diversity due to each of the two sets of SSRs suggested increase in overall genetic diversity after green revolution in Indian bread wheat cultivars. Differences were also observed in genetic diversity among cultivars from each of the six wheat growing agro-climatic zones of India. However, decade-wise analysis of genetic diversity among the post-green revolution cultivars indicated a progressive decline in genetic diversity, thus suggesting a need for involving diverse exotic, synthetic and winter wheat germplasm in Indian wheat breeding programs

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Genetic diversity – Grain weight specific SSRs – Indian bread wheat cultivars – Random SSRs – Triticum aestivum
Subjects:	Others > Wheat
Depositing User:	Ms K Syamalamba
Date Deposited:	19 Jun 2012 10:42
Last Modified:	19 Jun 2012 10:42
URI:	http://oar.icrisat.org/id/eprint/6009
Official URL:	http://dx.doi.org/10.1007/s10722-011-9713-6
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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