Author(s):

Shah Siddhi, Patel JB and Nikita Patel

Abstract: Stability for grain yield performance and genotype x environment (G x E) interaction was studied in 45 genotypes (Nine diverse parents and their 36 hybrids made by using half diallel mating design) of bread wheat by evaluating them in different environments [Early (25^th October), timely (15^th November) and late sowing (5^th December)] following randomized block design with three replications during rabi 2016-17 at Sagadividi Farm, Department of Seed Science and Technology, College of Agriculture, Junagadh Agricultural University, Junagadh. Two parents (NW 5013 and QLD 46) and twelve hybrids (PHSC 5 × GW 2010-287, DBW 90 × GW 2010-287, DBW 90 × BW 5872, NW 5013 × QLD 65, BW 5872 × QLD 65, GW 2010-287 × BW 5872, Raj 4238 × GW 496, QLD 65 × QLD 46, GW 2010-287 × QLD 46, BW 5872 × QLD 46, BW 5872 × Raj 4238 and GW 2010-287 × Raj 4238) expressed their stability across the environments for grain yield per plant due to their high per se for grain yield per plant, non-significant regression coefficient (b_i) and deviation from linear regression (S²d_i). The hybrids, NW 5013 × QLD 46, GW 2010-287 × QLD 65 and PHSC 5 x BW 5872 were having more grain yield per plant and had the least deviation from linear regression, but significant regression coefficient (bi >1) and thus, found to be highly responsive to better environments. The stable parents QLD 46 (15.78 g) and NW 5013 (15.94 g) were also showed stability for important yield components like grain filling period, plant height, length of main spike, peduncle length of main spike, number of spikelets per main spike, 1000 grain weight and biological yield per plant. Stable hybrids with respect to grain yield per plant also showed stability for one or more component traits like days to heading, grain filling period, days to maturity, plant height, number of effective tillers per plant, length of main spike, peduncle length of main spike, number of spikelets per main spike, number of grains per main spike, grain weight per spike, 1000 seed weight, biological yield per plant and harvest index. This indicated that stability of various component traits might be responsible for the observed stability of various hybrids for grain yield per plant. Hence, chances of selection of stable hybrids for yield could be enhanced by selecting for stability for yield components.

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