Estimation of adaptability of the maternal lines of the winter rapeseed hybrids bred at the V.S. Pustovoit All-Russian Research Institute of oil crops in the central zone of the krasnodar region, Russia

In ۲۰۱۸-۲۰۲۰, the maternal lines of winter rapeseed, Brassica napus L. developed at the V.S. Pustovoit All-Russian Research Institute of Oil Crops: ۱۶۸۱, ۱۸۴۰-۲, ۱۸۶۰, ۳۹۷۱۲, ۳۹۸۵۹, ۳۹۸۸۰, ۴۰۰۵۹, and ۴۰۱۷۷ were studied. The purpose of the research was a comparative estimation of the maternal lines of the winter rapeseed hybrids by calculated statistic parameters of adaptability, environmental and genetic plasticity, stability, stress resistance in the central zone of the Krasnodar region in different years. Indicators of environmental plasticity and stability were calculated by seed yield of the maternal lines of the winter rapeseed hybrids for three years due to the procedure by SA Eberhart, WA Rassell as revised by VА Zykin. To calculate a coefficient of a linear regression, the environmental indexes characterizing the variability of lines production conditions were defined. Stress resistance and genetic plasticity were determinated due to the equation by AA Rossielle & J Hamblin. Potential productivity and adaptability were identified by the procedure of LA Zhivotkov. The conditions of the ۲۰۲۰ were satisfactory for winter rapeseed plants growth and development. The average yield of the maternal lines was equal to ۴.۸۳ ton ha-۱. The conditions of ۲۰۱۸ and ۲۰۱۹ were not quite favorable, since the environmental index was negative (Ij= -۰.۱۴ and -۱.۲۳), and average yield was ۳.۳۳ and ۲.۲۴ ton ha-۱, respectively. The comparative estimation of the maternal lines of the winter rapeseed hybrids developed at the V.S. Pustovoit All-Russian Research Institute of Oil Crops by the parameters of the ecological plasticity and stability in the Krasnodar region showed that the line ۳۹۷۱۲ having the average seed yield per year of ۳.۷۰ ton ha-۱ combines a high level of plasticity, adaptability, stability and is characterized by a high genetic plasticity. This line possesses high responsibility to the advanced cultivation conditions. The line ۳۹۸۸۰ with the average yield of ۳.۵۷ ton ha-۱ also is characterized by environmental and genetic plasticity and adaptability. The lines ۳۹۸۵۹ and ۴۰۱۷۷ demonstrated the highest stability and resistance to the stress factors of environments. They are very adaptive to deterioration of the weather conditions. The selected maternal lines are very interesting for breeding of winter rapeseed hybrids of the Russian origin.

Keywords:

Winter rapeseed , Adaptability , Plasticity , Stability , Stress resistance