Grain yield and its components stability of bread wheat genotypes under rainfed conductions

Muhammed Ali Al-falahi1, Hussain Ahmed Sadalla2, Kamil Mahmood Mustafa3  Shwana Ahmad Hussain3

 1College of Agriculture- Duhok University

2College of Agriculture- SalahaddinUniversity

3 College of Agricultural Sciences- Sulaimani University, Bakrajo Street, Sul;aimaniyah-Iraq


Ten bread wheat genotypes   (Saraa-1, Sham-4, Maxipak,Babaga-3, Jawhir-3, Sale, NS732, REGAA6-1, QAF2AA-3 and IPA-95) were sown during 2015-2016 growing season at three locations (Sulaimani, Erbil and Duhok) under two sowing dates (1 November and 1 December). Randomized  Complete Block Design was used with three replications to estimate the stability of these genotypes. Three stability parameters (variance across environments, regression coefficient Bi and variance of deviation from regression Sdi) were used to identify the stability in yield and its components .The results showed that the genotypes Babaga-3 and Jawhir-3 had the best values according to stability parameters, indicating their wide adaptability over different  environments and be considered as favored  wheat genotypes under variable rainfall conditions in Iraq. The other genotypes  gave a high stability, performance not superior in yield and other traits, as other superior traits could be introduced to other genotypes in the improvement breeding program. 

  Key Words: Bread wheat, yield components, stability genotype × environment interaction regression


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