Adaptive potential of winter triticale varieties in arid conditions of the Northern Caspian

In the semi-desert zone of the north-west of the Astrakhan region in 2020-2022, studies on agroecological variety testing of promising winter triticale varieties were conducted on the rainfed field of the Pre-Caspian Arid Federal Scientific Center of the Russian Academy of Sciences. The purpose of the research is to determine the parameters of adaptability of highly productive varieties of winter triticale for cultivation in arid conditions of the Northern Caspian Sea. There were five varieties of domestic selection in the work (Testament, Zimogor, PRAG-152, Sergius and Forte). Records, observations and analyses were carried out according to the methodology of the State Audit, the methodology of B.A. Dospekhov was used for statistical processing; the methodology of S.A. Eberhart and W.A. Russell was used to calculate the parameters of adaptability, as presented by V.A. Zykin and others. The article presents the parameters of adaptability of the studied varieties in years with varying degrees of moisture: regression coefficient (bi), variance (HCP05), stress resistance (Ymin - Ymax), genetic flexibility (Ymax+Ymin)/2), stability (S2i). Depending on the behavior of varieties in various meteorological growing conditions, a promising high-yielding (2.64 t/ha) winter triticale Forte variety with high genetic flexibility (2.57) was identified. The selected Forte variety has good plasticity (the linear regression coefficient is above one - 1.13) and genetic stability (S2i = 0.006), therefore it can be recommended for industrial cultivation in difficult arid conditions of the semi-desert of the Northern Caspian.