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International Journal of Agricultural Research

Year: 2007 | Volume: 2 | Issue: 5 | Page No.: 500-503
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Authors

Parvez A. Sofi

A.G. Rather

Zahoor Dar

Keywords

Research Article

Association of Heterotic Expression for Grain Yield and its Component Traits in Maize (Zea mays L.)

Parvez A. Sofi, A.G. Rather and Zahoor Dar
In the present study fifteen phenotypically diverse white maize inbred lines (both local and exotic) were crossed to three testers namely W3, W5 and W3xW5 in line x tester fashion to generate 45 test cross progenies, which were evaluated in two diverse locations of Kashmir valley namely High Altitude Research Station, Larnoo and Regional Research Station, Wadura, representing diverse climatic regions, using randomized complete block design with three replications at each location. The analysis of variance for line x tester design pooled over locations revealed significant environmental variance for all traits except harvest index, genotype x environment interaction was significant for all traits except 100-seed weight, indicating greater influence of environment on the expression of these traits. Grain yield recorded heterosis upto 78.83% (mean value of 41%) in the present study. The mean heterosis estimates among component traits were highest in case of ear diameter (25%) followed by ear height (23%), 100-seed weight (21%) whereas, it was lowest in case of harvest index (7%). Ear diameter, harvest index and 100-seed weight had the highest correlation with grain yield in terms of heterotic expression (0.588, 0.518 and 0.495, respectively).
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