EVALUATION OF MAIZE (Zea mays L.) INBRED LINES AND HYBRIDS FOR HEAT TOLERANCE
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Date
2014-12-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
Experiment were conducted for evaluating the selected inbreds and commercial hybrids for heat tolerance at Agriculture College Farm, Bheemarayanagudi during early summer (January- sowing) and late summer (March-sowing) 2014.
The ANOVA revealed that the variation due to genotypes was significant for all the traits except ASI in inbreds and except canopy temperature in hybrids under optimum and heat stress conditions, indicating the presence of enough genotypic variation among the inbreds and hybrids.
The traits like Leaf firing (LF), Tassel blast (TB) and grain yield (kg ha-1) of the inbreds and grain yield (kg ha-1) of the hybrids showed higher PCV and GCV values under both conditions. High heritability coupled with high GA in inbred was observed for plant height, LF, TB, Chl a, total Chl , GYP (g), and grain yield (kg ha-1) for inbreds and hybrids under both conditions, indicating that these characters are under the control of additive gene action.
In inbreds correlation coefficient revealed that 100-grain weight under optimum conditions and NKC under heat stress condition showed strong positive relationship with GYP at phenotypic and genotypic levels. But in hybrids, 75% BHM and 100 grain weight under optimum and silk length under hat stress condition showed strong relationship with GYP at genotypic level. Path analysis of inbreds revealed that 50 % anthesis and NKC showed maximum direct effect on GYP at phenotypic and genotypic level under optimum and heat stress conditions respectively, suggesting that individual plant selections could be practiced in both conditions with these characters which could precisely lead to improvement in seed yield in the later generations.
Four inbreds viz., CI-4, CM-111, R-111 and YP-58 and five hybrids viz., GK-3059, P-3341, 900-M-Gold, DKC-9135 and CP-818 were identified as heat tolerant based on their mean performance for important traits viz., plant height, LF, TB and yield.
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