This study was carried out to determine the yield performances of 20 bread wheat genotypes across six environments in Central Anatolia, Turkey, in the 2000-2001 growing season. | Turk J Agric For 26 (2002) 275-279 © TÜB‹TAK Additive Main Effects and Multiplicative Interactions Analysis of Yield Performances in Bread Wheat Genotypes across Environments Yüksel KAYA, Çetin PALTA, Seyfi TANER Bahri Da¤dafl International Winter Cereals Research Center, . Box: 125, Konya - TURKEY Received: Abstract: This study was carried out to determine the yield performances of 20 bread wheat genotypes across six environments in Central Anatolia, Turkey, in the 2000-2001 growing season. The experimental layout was a randomized complete block design with four replications. Additive main effects and multiplicative interactions analysis (AMMI) indicated that the yield performances of genotypes were under the major environmental effects of genotype by environmental interactions. The first two principal component axes (PCA 1 and 2) were significant (p < ) and cumulatively contributed to of the total genotype by environment interaction. A biplot generated using genotypic and environmental scores of the first two AMMI components also showed that genotypes with larger PCA 1 and lower PCA 2 scores gave high yields (stable genotypes), and genotypes with lower PCA 1 and larger PCA 2 scores had low yields (unstable genotypes), as in the sites tested. Key Words: Bread Wheat, Yield, AMMI Analysis, Biplot Ekmeklik Bu¤day Genotiplerinde Çevreler Üzerinden Verim Performanslar›n›n Eklemeli Ana Etkiler ve Çarp›msal ‹nteraksiyonlar Analizi Özet: Bu çal›flma, 20 ekmeklik bu¤day genotipinin 6 çevrede verim performanslar›n› belirlemek amac›yla 2000-2001 y›l› yetifltirme sezonunda yürütülmüfltür. Denemeler, tesadüf bloklar› deneme deseninde 4 tekerrürlü olarak kurulmufltur. Eklemeli ana etkiler ve çarp›msal interaksiyonlar analizi (AMMI), genotip x çevre interaksiyonunda genotiplerin verim performanslar› üzerine çevresel etkilerin bask›n oldu¤unu göstermifltir. ‹lk iki ana bileflen ekseni (PCA 1 ve 2), istatistiksel olarak önemli (p<) bulunmufl .
