Author(s):

Navodeeta Raaj, SK Singh, Ankit Kumar and Avinash Kumar

Abstract: Present study was conducted using twenty four wheat genotypes under two environments namely non stressed (timely sown) and stressed (late sown) in Randomized Block Design with three replications at Wheat Breeding section of Dr. RPCAU, Pusa, Samastipur, Bihar during RABI 2016-17 to evaluate the bread wheat (Triticum aestivum L.) genotypes for terminal heat tolerance under late sown condition. Observations were recorded on sixteen characters in relation to terminal heat conditions to identify the tolerant genotypes. Analysis of variance revealed highly significant differences among the accessions for all the parameters under both timely and late sown conditions. Under timely sown condition PCV ranged from 5.04 to 19.7 for days to maturity and grain yield respectively. The range of GCV varied from 2.58 for Plant height to 16.21 for grain yield. Days to fifty percent flowering exhibited highest heritability (95.5) and plant height exhibited lowest heritability (24.8). Grain yield possessed highest genetic advance (27.49) whereas plant height possessed lowest genetic advance (2.65). Under late sown condition PCV ranges from 4.00 to 55.39 for days to maturity and thousand grain weight susceptibility index. GCV ranged from 2.59 to 53.07 for days to maturity and thousand grain weight susceptibility index. Days to fifty percent flowering exhibited highest heritability (93.5) and spike length exhibited lowest heritability (21.3). Thousand grain weight susceptibility index possessed highest genetic advance (93.5), whereas spike length possessed lowest genetic advance (2.59). The characters like tillers per plant, flag leaf area, grains per spike, harvest index, grain yield, thousand grain weight susceptibility index, heat susceptibility index exhibited high heritability coupled with high genetic advance as per cent of mean under both environments indicating that simple selection scheme would be effective for these traits to bring genetic improvement in desired direction.

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