Evaluation of bread wheat genotypes under irrigated multi-environment conditions using GGE biplot analyses
Özet
This research was carried out to determine stable genotypes, and
investigate genotype environment interaction (GEI) effects on the grain
yields of 9 bread wheat genotypes (5 cultivars, 4 advanced lines) across
eight irrigated environments in the Central Anatolian Region, in
2002-2003 and 2003-2004 growing seasons. The experimental layout was a
randomized complete block design with four replications. GGE biplot
methodology was used to evaluate phenotypic stability in genotypes. GGE
biplot analysis indicated that the effects of environments, genotypes
and genotype environment (GE) were highly significant (P < 0.01). The
first two principle component axes (PC1 and PC2) were significant (P <
0.01) and cumulatively contributed to 76.14\% of the total genotype by
environment interactions. The biplot (PC1 versus mean grain yield)
showed five groupings of genotypes: `Line-1' generally low yielding and
unstable (high negative PC1 score); and `Line-3' was low yielding and
moderately stable across environments (low positive PC1 score);
`Katea-1', `Yildiz-98' and `Line-2' were high yielding, and stable (had
low positive PC1 scores). `Konya-2002' was high yielding and moderately
stable across environments (low negative PC1 score). For irrigated bread
wheat genotypes grain yields were relatively stable at Haymana and
Cumra, while grain yields obtained at Konya were unstable across both
years. Besides, superior bread wheat genotypes selections with specific
or broad adaptation were identified by a biplot generated using
genotypic and environmental scores of the first two GGE biplot
components (PCA1 and PCA2).
Koleksiyonlar
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