و تجزيه واكنش ژنوتيپي در تعيين پايداري ارقام AAMI بررسي كارآيي روش

Study on the efficiency of AMMI method and pattern analysis for determination of stability in sugar beet varieties

In this study, efficiency of AMMI method and pattern analysis were investigated. Seventeen sugar beet varieties were studied in thirteen locations over three cropping seasons and root yield and sugar content were measured. On the basis of combined analysis of variance, effect of variety and variety xenvironment interactions for both traits were significant. The yield stabitity estimated-using Eberhart and Russell, Wrickeʹs Ecovalance, Shuklaʹs stabilty variance, AMMI and pattern analysis methods. In all stability methods used, varieties PPB, BRl(developed is Ardabil) and ICI were the most stable genotypes. Efficiency of Eberhart and Russellʹs method for estimating of G x E interaction for both traits was lower than 1PC1 in AMMI method. The efficiency of IPC1 was greater, by five to six times, than that of Eberhart and Russellʹs method for root yield and sugar content, respectively. SIPC3 in AMMI method were accounted about 50 % of G x E interaction sum of squars. Biplot of IPC1 and the mean of traits for varieties and locations or environments had good efficiency for detecting of G x E interaction patterns. Ranked correlation coefficients showed that AMMI method often generated more information than the other methods. Furthermore, this method generates new information which cannot be estimated by the other methods. It seems that AMMI and pattern analysis have higher efficiency for stability studies. However, results showed that using only one component of AMM1 method is insufficient, and at ʹeast two components (e.g. IPC1 and SIPCf) should be considered.