Abstract
Multi-environment trials are performed every year with the aim of evaluating sugar beet varieties in different environmental conditions of Serbia. The objective of this research was to interpret the effects of genotype, environment and genotype x environment interaction on root yield, sugar content and white sugar yield. GGE biplot method was used to estimate stability of seven sugar beet hybrids developed at the Institute of Field and Vegetable Crops, Novi Sad, Serbia. Mixed model of analysis of variance (ANOVA) was used for the analysis of trial results. Factor genotype effect was assumed fixed while effects of year and environment were assumed random. ANOVA showed that the environment had the greatest effect on root and white sugar yield, while year had the strongest effect on sugar content. Variations of all traits were under significant impact of genotype, while the GEI influence was not a significant. Results of GGE biplot analysis suggested that hybrid Sara was the most stable variety for root yield, while Lara had the greatest stability for sugar content and white sugar yield among the tested genotypes. Also, optimal locations were identified for each genotype, which can be useful when recommending sugar beet varieties for certain growing areas of this field crop.
Highlights
Results of analysis of variance (ANOVA) for three-factorial trial showed that effect of interaction between year and environment was significant at P < 0.001 level for all traits (Table 4)
Effect of year was significant at P < 0.001 level for sugar content and root yield because of specific weather conditions during two years of study, deficiency of precipitation in 2009 and surplus of precipitation in 2010
Genotype effect was significant for all investigated traits, but for sugar content it was on P < 0.001 level, while for root yield and white sugar yield it was on P < 0.05
Summary
Final objectives of this study were: (1) interpretation of effects of genotype, environment and GEI for root yield, sugar content and white sugar yield, and (2) stability evaluation of seven sugar beet hybrids using GGE biplot method, in regions of Serbia where this crop is grown. Sara is N - type sugar beet variety with high genetic potential for root yield and sugar content. Variety Nora has good balance between root yield and sugar content and belongs to N - type of hybrids.
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