GENETIC DIVERGENCE STUDIES IN RICE (Oryza sativa.L)
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Date
2012-06-05
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR
Abstract
ABSTRACT
The present study was undertaken to evaluate the set of 214 rice genotypes comprising of
land races, germplasm, INGER breeding lines and Local cultivars specifically adapted to
Tungabhadra command area of northern Karnataka were evaluated in augmented design with 4
standard checks for genetic divergence, molecular diversity. Genotypes were also evaluated for
extent of variability, association, and path analysis, genetic divergence based on both morphological
character for 13 traits and a set of 24 genotypes evaluated for molecular diversity using 14 SSR
primers. ANOVA revealed highly significant difference among the genotypes for quantitative traits
except panicle length and flag leaf length. High PCV and GCV estimates, high heritability and high
genetic advances were recorded biological yield per hill, number of spikelets per panicle, grain yield
per hill, yield component characters spikelet’s per panicle, flag leaf width, biological yield, and test
weight exhibited highly significant association with grain yield. Genotypic path coefficient analysis
revealed that test weight had the highest positive direct on grain yield, using mahalonobis
D2statistic, 214 rice genotypes were grouped into ten divergent clusters, wide genetic variability was
indicated by the intra and inter cluster distances, based on clusters means, clusters VIII ranked first,
it was also found that among all characters, days to maturity had highest contribution towards the
genetic diversity. Based on SSR analysis revealed that Polymorphic information content was highest
for SSR primer RM212, which is found to be highly informative. The simple matching indices
shows highest similarity index between GNV-GP-11-4017 & GGV-05-01, based on dendrogram 10
different clusters at nearly 85% similarity levels, it was also found that among all the clustering IV
was highly heterogeneous, the PCA revealed the genetic relationship among the rice genotypes. In
conclusion, allelic diversity revealed by 14 SSR primers was sufficient enough to distinguish
between the germplasm, cultivars, land races and INGER.the alleic variation was lower within the
cultivars than germplasm, land races and indicating the chance to exploit distant relatives to broaden
the genetic base of rice genotypes.
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