engleski

Characterization of genotype by environment interactions in soybean breeding programmes of southeast Europe

Southeast Europe is a Europe’ s major production area of soybean of maturity groups (MG) 0, I and II, but genotype by environment interaction (GEI) for soybean traits in this region is still not characterized. The objective of this study was to characterize GEI in soybean grown in Croatia for seed yield, protein and oil content. Fourteen soybean cultivars of MG 0 and I were evaluated at 15 environments. In the combined ANOVA, genotypes, environments and GEI were significant. All three seed traits were more affected by year than location effects and that seed yield and protein content were more sensitive to environmental changes than oil content. GEI is generally of less importance than effects of genotypes and years particularly for oil content. High-yielding genotypes had values of regression coefficient (b) close to 1 indicating that they were not responsive to extreme environments either positive or negative. Means and b values was not correlated for yield and negatively correlated for protein and oil content, probably due to low-input practice in the region. No recognizable differences in means, b values and PC scores of AMMI analysis between two MGs for all traits indicated that soybean cultivars of MG0 may be recommended for growing in the region since they responded similarly to environmental changes like full-season genotypes of MGI.

Glycine max; genotype by environment interaction; linear regression; AMMI; seed yield; protein content; oil content

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