Protein content and level of plasticity, stability, homeostaticity of collection rye samples under conditions of the northwestern region

The aim of the research is to give an overall assessment of the value of the "protein content in grain"of winter rye samples. Collection samples of winter rye from VIR served as the material for the study. The research was carried out in a field trial from 2012 to 2017. The amount of protein was calculated in the biochemical department of the VIR. The study included 9 collection samples of winter rye. All samples belong to winter diploid rye (Secalecereal L. var. Vulgare Koern). For a reliable assessment of the samples in terms of plasticity, stability and homeostaticity parameters, the following were calculated: the range of protein content in grain (d) (determined according to V.A.Zykin, 1984), realization of the productivity potential, ecological plasticity index (Jps) (estimated according to SA Eberhart, WA Rassell, 1966), the stability factor (SF) (according to D. Lewis (1954), the breeding value of the variety (Sc) and the index of homeostaticity (Hom) (calculated according to V.V. Khangildin), the indicator of the relative stability of the variety (St2) and stability criterion (A) (calculated according to N.A. Sobolev, 1980), coefficient of variation(V) (calculated according to B.A.Dospekhov). Statistical data processing was performed using the analysis of variance method. The average protein content in grain was reported to be 10.3%. It varied from 7.6 % for the Bereginya sample to 13.4 % for the Vavilovskaya sample in 2013. By the method of ranking the samples according to all the indicators used, it was found that the most suitable samples for growing in order to obtain a high and stable protein content in grain under the conditions of the Leningrad region are the samples Ilmen, Era, Krasnoyarskaya universalnaya, Yantarnaya, Rushnik 2. These samples are characterized by a smaller sum of ranks and are the most adapted to the cultivation conditions for obtaining highquality grain.