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Genetics of Harvest index vis-a-vis biological and grain yield in Wheat (Triticum aestivum L)

S.K. Thakral, O.P. Luthra and R.K. Singh
Cereal Research Communications
Vol. 7, No. 2 (1979), pp. 153-159
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/23779092
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Genetics of Harvest index vis-a-vis biological and grain yield in Wheat (Triticum aestivum L)
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Abstract

A seven-parent diallel analysis for genetic aspects of harvest index vis-a-vis grain and biological yield in wheat showed considerable genetic variability. Though harvest index was highly correlated with grain yield, yield improvement through harvest index seems to be faster due to its high coefficient of variability, high heritability and high expected genetic advance. The variances due to both general and specific combining ability were significant for all the three characters except for grain yield where variance due to specific combining ability was not significant. The ratio, σ2D/σ2A, fell in the range of partial dominance. Also the F1 family produced from a cross between parents with high and low harvest indices were found to be intermediate. Close agreement was observed between the per se performance and general combining ability effects of lines. The correlations between per se performance of the hybrids and their specific combining ability effects were, however, low. The crosses between two good general combining parents resulted in higher specific combining ability effects for harvest index. These results have been discussed in the light of their practical implications.

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