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Paper Details

Heterosis studies for drought tolerant and grain yield traits in maize (Zea mays L.)

K.T. VENKATESHA*, H. SHIVANNA1, M.ASIF AND K.V. VIJAY KUMAR

Journal Title:International Journal of Agricultural Sciences
Abstract


The present study was conducted to assess heterosis for drought tolerant and grain yield traits in maize. Seventy F1s generated by crossing ten drought tolerant lines with seven drought susceptible testers were evaluated. The ratio of sca / gca variance revealed that there was preponderance of non additive gene action in the expression of all the traits under study. Among the hybrids, significant standard heterosis over NAH-2049 and NAH-1137 in the desirable direction was exhibited by many crosses for all the characters. Four hybrids SKV-70 SKV-58, SKV-375 SKV-57, SKV-156 SKV-5 and SKV-69 CML-322 showed positive standard heterosis for all the drought tolerant traits viz., SPAD chlorophyll meter reading (SCMR), specific leaf area(SLA), anthesis silking interval (ASI), carbon isotope discrimination (?13C) and yield, These crosses are from parents with high x low, low low overall GCA effects. Top ranking hybrids were found to have high (H) heterosis status for several characters studied. Nearly 50 per cent (36 out of 70) hybrids had high overall heterosis.

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