Estimation of Genetic Variation and Traits Contributing to Grain Yield in Advance Lines of Rice (Oryza sativa L.) using Agro-morphological Characters

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Estimation of Genetic Variation and Traits Contributing to Grain Yield in Advance Lines of Rice (Oryza sativa L.) using Agro-morphological Characters

Fayaz Ahmad, Fida Muhammad Abbasi, Habib Ahmad
Int. J. Biosci.8( 5), 60-74, May 2016.
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Abstract

Genetic diversity is fundamentally essential in plant breeding and its assessment in the available genetic stock provides valued information about its possible utilization in rice breeding program for improvement of yield and quality. The present study was carried out with the objectives to assess the genetic variation in 56 rice advance lines and six control varieties i.e.JP-5, Basmati-385, IR-24, Fakhr–e-Malakand, IRBB-59 and Swat-1 on the basis of 18 economically important quantitative and qualitative agro-morphological traits. The experiment was conducted under the climatic conditions of Mansehra, Pakistan using a randomized complete block design with three replications. ANOVA estimated a considerable amount of variation (CV %) ranging from 0.64 for days to maturity to 19.07 for dry weight of top three leaves, whereas significant differences (p< 0.05) were recorded for 15 evaluated quantitative traits. Cluster analysis separated the genotypes into six distinct groups at Euclidean distance of 7. The principal component analysis explained 82.206% cumulative variability in quantitative traits with the formation of five independent components. Among the loadings of patterns of PCA number of tillers revealed highest contribution to grain yield per plant. The analysis estimated high genetic variations for the evaluated traits in the advance lines of rice and could serve in future as potential donor parents in breeding for rice improvement.

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