Studies on genetic variability for physiomorphological and seed vigour parameters in wheat (Triticum aestivum L.Em.Thell.)
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Date
2014
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Publisher
CCSHAU
Abstract
The present investigation “ Studies on genetic variability for physio-morphological and seed vigour
parameters in wheat (Triticum aestivum L. Em. Thell.) was conducted to evaluate 40 genotypes to determined the
magnitude of variability for various morphological and seed vigour parameters in wheat as well as to study the
character association and genetic divergence. Analysis of variance revealed considerable amount of variability
among genotypes for most of the characters under study. Plant drooping height, number of tillers per meter, flag
leaf area, seed density and harvest index exhibited high GCV. The differences between GCV and PCV values were
minimum which show least influence of environment. Heritability estimates were high for all the characters except
grain breadth and germination per cent. Plant drooping height, number of tillers per meter, flag leaf area, harvest
index, flag leaf length and seed density exhibited high genetic advance as per cent of mean alongwith high
heritability estimates. The grain yield showed significant and positive correlation with number of tillers per meter,
flag leaf length, flag leaf area, harvest index, grain weight per spike, 1000 grain weight and grain growth rate at 28
days. Thousands grain weight, harvest index and flag leaf area had positive direct effect on grain yield. So, direct
selection for these traits will be effective to increase the grain yield. On the basis of relative magnitude of
distances, 40 genotypes were grouped into 6 clusters, which indicated the presence of considerable amount of
genetic diversity among the genotypes studied. Cluster V showed maximum genetic divergence with cluster IV
and also having higher mean values for important yield traits and thus hydbridization involving genotypes of
cluster V with genotypes of cluster IV is advocated in order to achieve high yielding segregants.
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Keywords
Pysio-morphological, Seed vigour parameters, Heritability, Genetic advance, Correlation, PCV, GCV, Genetic divergence