Variability and divergence studies in winter wheat “Triticum aestivum
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Date
2007
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Publisher
SKUAST-K
Abstract
The present investigation “Variability and divergence studies in winter wheat” was undertaken to obtain information on the genetic variability and genetic divergence with respect to yield and yield contributing traits among 160 wheat genotypes (157 winter wheat genotypes and three spring wheat varieties viz. Shalimar Wheat-1, HS-240 and VL-738 as checks) during rabi, 2005-06 at the Experimental Farm of High Altitude Rice research Sub-station, Larnoo.
The analysis of variance, revealed highly significant differences for all the traits studied. High heritability (b.s) was demonstrated by all the traits. Effective tillers plant-1, grains spike-1 and 100-seed weight showed highly significant and positive correlations with the grain yield revealing their importance in selection while seed size showed positive but non-significant correlation with yield.
Path analysis revealed maximum positive and direct effect by effective tiller plant-1, 100-seed weight and grains spike-1 on grain yield plant-1. Analysis of variance for dispersion revealed the highly significant differences for all the traits indicating diversity among the genotypes, grouping the 160 genotypes into 13 clusters, with cluster N. III having maximum number (54) of genotypes, followed by cluster No. I (41) & cluster V (33) genotypes. Seven clusters were mono-genotypes. Maximum inter-cluster distance was observed between the cluster IX and III (3639.86) whileas, the maximum intra-cluster distance was observed in the cluster IV (443.46) and cluster V (396.53).
Highest per cent contribution to divergence came from yield plant-1, effective tillers plant-1 and grains spike-1. Clustering by D2 statistics was also confirmed by the canonical root analysis. Where in the highest contribution towards canonical roots was confirmed by yield plant-1, effective tiller plant-1 and grains spike-1.
Description
M.Sc Thesis submitted to SKUAST Kashmir
Keywords
Variability, divergence, Wheat (Triticum aestivum L, Genetic and Plant Breeding