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20111
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Author: Sharma, Preeti × End date: 2011 × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Genetic diversity and correlation analysis for morphological traits and grain yield in advanced lines of bread wheat
    (CCSHAU, 2011) Sharma, Preeti; Yadava, R.K
    The study entitled “Genetic diversity and correlation analysis for morphological traits and grain yield in advanced lines of bread wheat” was conducted during rabi 2009 at CCSHAU, Hisar. The advanced homozygous lines (170 nos.) were undertaken for genetic divergence and for estimate of mutual correlations vis-a-vis path analysis for grain yield with 10 morphological traits namely days to 50 % heading, plant height (cm), peduncle length (cm), spike length (cm), spikelets per spike, number of effective tillers per plant, spike weight (g), weight of grains per spike (g), number of grains per spike, hundred grain weight (g). Coefficient of variation being in the range of 1.40- 8.34 indicated adequacy of material and the traits studied for further estimation of genetic variability parameters. Heritability (broad sense) estimates were quite high for grain yield per plant followed by hundred grain weight and number of effective tillers per plant. Improvement can be realized to an extent ranging from 66 to 30 per cent for grain yield per plant, tillers per plant, hundred grain weight, and grain weight per spike. Highly significant and positive association was observed between grain weight per spike and spike weight. The high direct effects in positive direction for the dependent variable i.e grain yield per plant was recorded for number of effective tillers per plant followed by number of grains per spike, and hundred grain weight. In general, the indirect effects of the characters towards grain yield per plant were low, but the main contributers are tillers per plant, number of grains per spike and hundred grain weight. Hierarchical Euclidean cluster analysis of 170 genotypes into 9 clusters with variable number of advanced lines which indicated the presence of considerable amount of genetic diversity in the material. The average intra- cluster distance between the advanced lines was recorded maximum for cluster IV thereby indicated the presence of more diversity among the genotypes included among these cluster. The inter-cluster distance has been maximum between clusters II vs. VII followed by cluster IV vs. VII and VI vs. VII and was least for cluster I vs. II. The maximum per cent contribution towards the total genetic divergence was indicated for grain weight per spike followed by grain yield per plant, hundred grain weight and plant height. Based on cluster mean, the genotypes that may be promising for the improvement programme in bread wheat are identified as RIL- 91from cluster IV for plant height and number of spikelets per spike. RIL- 31 from cluster VII was found better for number of grains per spike and grain yield per plant. RIL- 45 from cluster VIII could be explored for maximum hundred grain weight and minimum days to 50 per cent heading as well. It is suggested that grain yield can be improved through direct selection for effective tillers per plant, number of grains per spike and hundred grain weight.