بررسی اثر متقابل ژنوتیپ × محیط و پایداری عملکر‌‌د برگ خشک ژنوتیپ‌های توتون ویرجینیا با استفاده از رگرسیون تای (Tai) وAMMI

To determine the yield stability and adaptability of the genotype of tobacco, 5 genotypes of flue-cured tobacco were evaluated in experiment using a randomized completely block design (RCBD) with three replications at two locations including Rasht and Tirtash tobacco Research Centers (IRAN), during the growing season of 2008-2010 (four environment). The interaction of genotype × environment in AMMI and Tai analysis method was significant (p ≤ 0.01). In Tai regression analysis method of genotype 1, 3, 5 were in part stability. But genotype (G3) had a high stability comparing the others because of having λ near to 1 and α near to zero and also because of a higher average yield than the total average yield. In AMMI1 model, genotype 3 was introduced as a stable genotype, and also in AMMI2 model, the first two principle component axes (PCA 1 and 2) were significant (p ≤ 0.01) and the first Interaction Principal Component Axis (IPCA1) of the interaction captured 87% of the interaction sum of squares. The Second Interaction Principal Component Axis (IPCA2) explained a further 12% of GEI sum of squares. And cumulatively contributed 99% of the total GEI. Thus, in this model AMMI2, the first two principle components were considered. And the other PCA were considered as noise. The biplot technique was used to identify appropriate genotype for special locations. Result show that genotype 3 (Caspian z1) with the highest interaction were the most stable genotype. Furthermore, genotype 3 was known as more suitable for Tirtash (S2) and Rasht (S1) locations. In general, in this study, genotype 3 was known as the most suitable genotype on the base of Tai regression analysis and AMMI method.