GGE biplot analysis of sugar beet multi-environment trials

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.

Multilokacijski ogledi izvode se svake godine sa ciljem procene hibrida šećerne repe u različitim agroekološkim uslovima Srbije. Cilj ovog istraživanja je bio da se utvrdi uticaj genotipa, spoljašnje sredine, kao i interakcije genotipa i spoljašnje sredine na prinos korena, sadržaj šećera i prinos kristalnog šećera. GGE biplot metod je korišćen za procenu stabilnosti sedam hibrida šećerne repe stvorenih u Institutu za ratarstvo i povrtarstvo. Mešoviti model analize varijanse (ANOVA) je korišćen za analizu rezultata ogleda. U pretpostavci analize varijanse efekat genotipa je bio fiksan, dok su efekti godine i sredine bili slučajne promenljive. ANOVA je pokazala da je najveći efekat na prinos korena i prinos kristalnog šećerna imala spoljašnja sredina, dok je godina imala najveći uticaj na sadržaj šećera. Genotip je imao značajan uticaj na varijabilnost svih ispitivanih osobina, dok uticaj interakcije genotip/sredina nije bio značajan. Rezultati analize GGE biplota ukazuju da je Sara bila najstabilniji hibrid za prinos korena, dok su sadržaj šećera i prinos kristalnog šećera bili najstabilniji kod hibrida Lara. Identifikovane su optimalne lokacije za svaki genotip, što može biti od koristi pri davanju preporuka za gajenje hibrida šećerne repe u određenim regionima proizvodnje ovog useva.