Genotype by Environment Interaction in Bread Wheat Across Dry land Environments
Genotype by Environment Interaction in Bread Wheat Across Dry land Environments
Muhammad Ilyas* and Fida Mohammad
ABSTRACT
Genotype by environment (GE) interaction complicates selection process of desirable genotypes. Therefore, newly developed germplasm or genotypes needs to be evaluated in multi-environment trials (METs) to know yield potential and adaptability. This experiment was designed to interpret GE interaction using 55 F5:8 bread wheat recombinant inbred lines (RILs) with five checks. Experimental material was planted using alpha lattice design in two replicates at Peshawar (E1and E5), Kohat (E2 and E6), Sarai Naurang (E3 and E7) and Dera Ismail Khan (E4 and E8) (Khyber Pakhtunkhwa) during 2014/15 and 2015/16. Locations in each year were considered as independent environments. Pooled ANOVA revealed significant interaction due to GE for days to heading, days to maturity, grain filling duration, grain growth rate, grains spike-1, 1000-grain weight and grain yield. Averaged over eight environments, wheat RIL’s 44, 55, and 25 were desirable for days to heading, days to maturity, grain filling duration, grain growth rate, grains spike-1 and grain yield. Mean grain yield ranged from 1613 to 2471 kg ha-1 across environments. Among the tested environments, Sarai Naurang (E3 and E7) was identified as highly productive environment. The RIL25 had superior performance for various traits. Wheat RIL25 produced maximum grain yield in E2 (3123 kg ha-1), E3 (3665 kg ha-1) and E7 (3256 kg ha-1), thus emerged as promising line with wider adaptation. Conversely, RIL24 had higher grain yield in E1 (2800 kg ha-1); RIL1 in E4 (2884 kg ha-1); RIL58 in E5 (2370 kg ha-1); RIL7 in E6 (3200 kg ha-1) and RIL53 in E8 (2339 kg ha-1) suggesting their specific adaptability to respective environments. Grain yield was significantly correlated with days to heading, grain growth rate and grains spike-1. Keeping in view the significance of GE interaction, it would be worthwhile to carryout stability analysis for identifying high yielding RILs with suitable stability.
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