Indian Society of Genetics & Plant Breeding

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ANALYSIS OF DIVERGENCE IN SOME COLD-TOLERANT RICES

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Genetic divergence of ninety-four rice genotypes, comprising 74 Fts and 20 parents, grown
over three cold stress environments, was assessed based on five reproductive stage cold
tolerance and adaptability related characters. Using 0 2 statistic and canonical analyses, the
genotypes were grouped into 18 clusters. The clustering pattern suggested that genetic and
geographic diversity were not necessarily related. Plant height, days to flowering, fertile
spikelets/panicle and percent fertility were indicated as important contributors to genetic
divergence in cold tolerant rices. Traditional japonica varieties and their japonica x indica
hybrids were distin('tly apart from the indica varieties and indica X indica hybrids in the
analyses. The divergence of japonica cultivars K332 and Sarkat, and the indica X indica
hybrids of Silewah was substantial from both the indica and japonica stocks, suggesting
their use in breeding.
 

Keywords: Multivariate analysis, genetic diversity, cold-tolerant rice.

Info

Year: 1995
Volume: 55
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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