Compatibility and stability of new rhizomania resistant multigerm hybrids in sugar beet (Beta vulgaris L.)

Five new and resistant rhizomania multigerm hybrids were prepared by crossbreeding of related parents and for preliminary evaluation and compatibility evaluation with two multigerm and resistant and one sensitive internal control, were evaluated in five regions of Hamedan, Karaj, Mashhad, Shiraz, and West Azerbaijan under Rhizomania natural infection. The design was a randomized complete block with four replications, which was conducted in the 2020 crop year. In this study, root yield, sugar content, white sugar content, and white sugar yield were measured.In the present study, although there was no significant difference between genotypes in Karaj and Shiraz in terms of white sugar yield, but in Mashhad and Hamedan environments, hybrid No.3, with an average of 11.24 and 13.51 ton/ha, respectively, and in Miandoab environment foreign control cultivar (Aras) with an average of 15.06 ton/ha, showed the highest white sugar yield. AMMI analysis results showed that the first two components explained 69.81 and 25.48% of the variance of the interaction for root yield, respectively. The biplot diagram obtained from the first and second main components of interaction for genotypes and environments showed that genotype G7 (Motahar) was a stable genotype and G9 (Aras) was an unstable genotype. Based on the results of two-dimensional diagrams related to the first two main components of the interaction of genotype in the environment, for Miandoab and Shiraz environments, genotype number G9 (Aras) and for Hamedan, Mashhad, and Karaj environments, G3 hybrid showed suitable private compatibility and was identified as suitable genotypes for these environments.