Genotype by Environment Interactions of Vegetative Growth Traits of Bread Wheat Genotypes
Hafsa Naheed* and Hidayat-Ur-Rahman
Determining the amount of genotype by environment interaction (GEI) is an important step in identifying high yielding and stable genotypes for cultivar development. Keeping in view the significance of genotype and environment, a multi environment study was conducted to evaluate the response of genotypes to different cropping systems and environments. The performance of vegetative growth traits of the 40 exotic bread wheat lines was assessed across seven different environments during 2015-16 and 2016-17 growing seasons. The trials were conducted using RCB design at four locations for two years; Research Farm, of the University of Agriculture, Peshawar; Agriculture Research Station, Buner; Agriculture Research Station, Baffa, Mansehra; and Barani Agriculture Research Station, Jarma, Kohat (one year only). Data were recorded on leaf area, plant height, biological yield and straw yield. Highest plant height was recorded for G02, G31 and G11. The exotic lines included in the study generally had more plant height in Peshawar as compared to other locations. The highest maximum mean for leaf area was observed for G17 and CSA while minimum was observed for G03 followed by G33 and G25. Among the seven environments, genotypes on average produced larger flag leaves having maximum leaf area in Peshawar while lowest was observed in Mansehra. For straw yield of the 40 genotypes across seven environments, the highest straw yield of 12547 kg ha-1 was produced at Mansehra in 2016-17 and the lowest yield of 2440 kg ha-1 was recorded at Buner in 2017-18. Overall, the genotypes included in the study had more biological yield in Mansehra as compared to other locations. Line G06 and G17 produced maximum biological yield. The lines with desirable characteristics can be used in hybridization programs to combine these characteristics in single line, or to transfer them to other high yielding varieties.
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