AMMI stability value and simultaneous estimation of yield and yield stability in bread wheat (Triticum aestivum L.)

Farshadfar, Ezatollah; Mahmodi, Nasrin; Yaghotipoor, Anita
December 2011
Australian Journal of Crop Science;2011, Vol. 5 Issue 13, p1837
Academic Journal
In order to determine stable bread wheat genotypes with high grain yield via a single parameter, field experiments were conducted with 14 genotypes for 3 consecutive years (2008-2011) under two different conditions (irrigated and rainfed) in a complete randomized block design with three replications in each environment. Combined analysis of variance showed highly significant differences for the GE (genotype-environment) interaction indicating the possibility of selection for stable entries. The results of AMMI (additive main effect and multiplicative interaction) analysis indicated that the first four AMMI (AMMI1-AMMI4) were highly significant (P<0.01). The partitioning of TSS (total sum of squares) exhibited that the environment effect was a predominant source of variation followed by GE interaction and genotype effect. The GE interaction was ~5 times higher than that of the genotype effect, suggesting the possible existence of different environment groups. AMMI stability value discriminated genotypes 10 and 6 as the stable accessions, respectively. Based on the YSI (yield stability index) and new RS (rank-sum) the most stable genotypes with high grain yield were genotypes 13 and 10. The results of this investigation proved that SI (sustainability index) and I (stability index) are not suitable stability indices for discriminating stable genotypes with high grain yield.


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