Mean performance and stability parameters for comparing bread wheat cultivars under different environmental conditions

Document Type : Original Article

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Department of Agronomy, Faculty of Agriculture, Sohag University, Sohag, Egypt

Abstract

The present study was conducted to selecting wheat stable cultivars with high productivity across various environments using the models of Eberhart & Russell (1966) and Tai (1971). Fife wheat cultivars viz, Shandwell 1, Sids 1, Sids 12, Giza 168 and Misr 2 were grown in a randomized complete block design with four replications under sixteen environmental conditions (2 years x 2 locations x 4 sowing dates) on yield and yield components during two successive seasons of 2017/2018 and 2018/2019. Pooled analysis of variance for grain yield and its components revealed significant variance due to genotypes, environments, and their interactions, indicating that they varied in their responses to diverse environments. Highest significant grain yield across varied environments was found by Sids 12 (14.60 ardab/feddan) followed by Shandwell 1 (13.61 ardab/feddan). The results indicated that according to Eberhart & Russell and Tai, the cultivar Shandwell 1 was genetically stable across various environments because it showed high mean performance for grain yield over these environments when compared with grand mean beside acceptable stability parameters (bi near to one, S2di non-significant, α stability value not significantly differed from zero and the λ statistic was not significantly differed from one, also it appeared stable over environments for other traits according to both previous methods. Meanwhile, cultivar Sids 12 were stable over all the studied environments for grain yield, but only according to Eberhart & Russell method.

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