Environmental trial of pea breeding acessions

Abstract

The aim of the study was to determine the information content and adequacy of the ecological testing points of the pea breeding material and to identify the "ideal" genotype.
 Materials and methods. The breeding material in the experiments was represented by cultivars bred at the PPI nd.a. V.Ya. Yuriev (Tsarevych, Oplot, Otaman, Metsenat, Korvet, Haiduk, and Malakhit) and ten breeding lines (SL 11-129, SL 11-213, SL 11-55, SL 11-58, SL 10-37, SL 11-32, SL 10-132, SL 09-118, SL 11-166, and SL 11-176). In addition there was one cultivar (Svit) bred at the Plant Breeding and Genetics Institute. All the cultivars are leafless, semi-dwarf, mid-ripening, except for Tsarevych (mid-early). The field experiments were carried out in accordance with the methods of field experimentation, using the conventional pea growing technology. The seeding rate was 1.2 million germinable seeds/ha; the plot area was 10 m2. To evaluate the accessions for the variability in different environments, we used a regression model developed by S.A. Eberhart and W.A. Russel, where the regression coefficient is an indicator of the genotype-environment interaction. This model is included in "Guidelines for Environmental Trials of Corn".
 Results and discussion. Thus, comparing the regression coefficient in pea cultivars Oplot, Tsarevych, Haiduk, Korvet, and Metsenat, we could conclude that these accessions were highly intensive in the OSES conditions and extensive in the PPI NAAS conditions (except for Metsenat). Regarding the regression coefficient in the breeding lines, none of them had a regression coefficient of 1.0. Over the study period, the regression coefficient was 1.4 only in line SL 11-58 (PPI NAAS) and 1.2 (OSES), characterizing this line as intensive regardless of the place of cultivation.
 Taking into account that the regression coefficient values of <1 are intrinsic to extensive accessions, lines SL 10-132 (RC = 0.4) and SL 11-176 (RC = 0.8) are preferred. Because these accessions also have a high genotypic effect. In addition, the regression coefficient in breeding line SL 09-118 was 0.9, with a genotypic effect of 0.07. Such combination of the indicators characterizes the line as relatively stable, with sufficient potential performance, and this breeding line will not be demanding to growing conditions similar to the OSES ones.
 Conclusions. Thus, the evaluation of both cultivars and breeding lines in the environmental trial showed that the pea breeding at the Plant Production Institute named after VYa Yuryev had a significant potential to create cultivars that would be well-adapted to both eastern and southern conditions, and that environmental trials remained an effective tool for assessing breeding material and selecting accessions with the maximum fulfillment of the genetic potential