ASSESSMENT OF GENOTYPE BY ENVIRONMENT INTERACTION, YIELD STABILITY AND INTERRELATIONSHIPS AMONG DIFFERENT STABILITY MEASURES OF BREAD WHEAT GENOTYPES
El-Gabry, Yasser; Amal Z.A. Mohamed;
Abstract
The objectives of this study were to compare nine parametric and 5
nonparametric stability measures and to identify high yielding and stable bread wheat
genotypes in twelve variable environments during 2014-15 and 2015-16 growing
seasons. The wheat genotypes comprised ten local cultivars and five exotic Syrian
genotypes. They were grown in a split plot design arranged in a randomized complete
blocks with 3 replications. Combined analysis of variance for grain yield (kg m-2)
indicated that the genotypes, environments and their genotype x environment interaction
effects were highly significant. The parametric stability statistics; deviation from
regression (S2d) , ecovalence (Wi), stability variance (σi2), coefficient of determination (R2)
and mean variance component for a pairwise G x E interaction (P59) revealed that the
local cultivar Sakha 93 was the most stable genotype, while cultivar’s superiority index
indicated that the local cv. Shakha 94 was considered the most stable genotype. The
nonparametric stability statistics indicated that cv. Giza 168 exhibited the smallest
changes in rank (Si(2)) and thus was the most stable genotype. According to the two
nonparametric stability measures (TOP and RS), the two local cvs.; Sakha 94 and Sids 1
were the most stable genotypes for grain yield. As for comparing the fourteen stability
measures, the S2d, Wi, σi2, P59 and the nonparametric stability measures (Si(2), Si(3) and
Si(6)) were nearly similar in assessing the relative stability of genotypes, whereas
remaining stability measures deviated from others. The rank correlation analysis
indicated that most nonparametric statistics were significantly correlated with parametric
measures and therefore can be used as alternatives due to its simplicity.
nonparametric stability measures and to identify high yielding and stable bread wheat
genotypes in twelve variable environments during 2014-15 and 2015-16 growing
seasons. The wheat genotypes comprised ten local cultivars and five exotic Syrian
genotypes. They were grown in a split plot design arranged in a randomized complete
blocks with 3 replications. Combined analysis of variance for grain yield (kg m-2)
indicated that the genotypes, environments and their genotype x environment interaction
effects were highly significant. The parametric stability statistics; deviation from
regression (S2d) , ecovalence (Wi), stability variance (σi2), coefficient of determination (R2)
and mean variance component for a pairwise G x E interaction (P59) revealed that the
local cultivar Sakha 93 was the most stable genotype, while cultivar’s superiority index
indicated that the local cv. Shakha 94 was considered the most stable genotype. The
nonparametric stability statistics indicated that cv. Giza 168 exhibited the smallest
changes in rank (Si(2)) and thus was the most stable genotype. According to the two
nonparametric stability measures (TOP and RS), the two local cvs.; Sakha 94 and Sids 1
were the most stable genotypes for grain yield. As for comparing the fourteen stability
measures, the S2d, Wi, σi2, P59 and the nonparametric stability measures (Si(2), Si(3) and
Si(6)) were nearly similar in assessing the relative stability of genotypes, whereas
remaining stability measures deviated from others. The rank correlation analysis
indicated that most nonparametric statistics were significantly correlated with parametric
measures and therefore can be used as alternatives due to its simplicity.
Other data
Title | ASSESSMENT OF GENOTYPE BY ENVIRONMENT INTERACTION, YIELD STABILITY AND INTERRELATIONSHIPS AMONG DIFFERENT STABILITY MEASURES OF BREAD WHEAT GENOTYPES | Authors | El-Gabry, Yasser ; Amal Z.A. Mohamed | Keywords | Bread wheat;Grain yield;Parametric and nonparametric stability measures;Correlation | Issue Date | 1-Jan-2019 | Journal | Egyptian Journal of Plant Breeding | Volume | 23 | Issue | 1 | Start page | 181 | End page | 195 |
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