Genotype-by-year interaction and simultaneous selection for grain yield and stability in winter barley

Boryana Dyulgerova and Nikolay Dyulgerov
Agricultural Academy, Institute of Agriculture, 8400 Karnobat, Bulgaria

Abstract

Dyulgerova, B. & Dyulgerov, N. (2024). Genotype-by-year interaction and simultaneous selection for grain yield and stability in winter barley. Bulg. J. Agric. Sci., 30(3), 466–475

The objective of this study was to evaluate genotype-by-year interaction for grain yield of 20 winter barley genotypes. The study was conducted during six growing years in the experimental field of the Institute of Agriculture – Karnobat, Southeastern Bulgaria. Various stability models were employed to identify high-yield and stable genotypes. The AMMI and BLUP methods demonstrated that the grain yield of the winter barley genotypes was significantly affected by genotype, growing season, and their interaction. Most of the non-parametric stability statistics used showed a significant positive correlation with grain yield, suggesting that they can be used as an alternative to parametric methods in identifying stable genotypes. Based on several statistical measures, genotypes G17 (K16/3-12), G20 (А8/2), and G15 (K16/1-21) were found to be more high-yielding and stable than the national standard cultivars G1 (Obzor) and G2 (Emon). This result was confirmed with the WAASBY index, indicating the efficiency of the WAASBY statistics in selecting superior barley genotypes. The genotype G17 (K16/3-12), with a consistently high yield performance, could be recommended as a new cultivar and genetic resource for improving the grain yield of winter barley in Southeastern Bulgaria.

Keywords: Hordeum vulgare L.; multi-year trials; stability; grain yield

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