EVALUATION OF THE ADAPTIVE POTENTIAL OF PROMISING SHALLOT ACCESSIONS

Abstract

Ecological stability and high adaptive potential are the main factors for stable performance and yield of agricultural crops under changing environmental conditions; therefore the selection of stress-resistant genotypes is relevant at all stages of breeding. Purpose. To evaluate and select promising breeding accession of shallots by adaptive potential for the "green leaf yield" trait and its components. Methods. Field, laboratory, computational and analytical methods were used in the study. The study was conducted in outdoors at the Institute of Vegetable and Melon Growing of NAAS in 2017–2020. Five breeding hybrid accessions were investigated. Lira was the check variety. Results. Having assessed the adaptive potentials of 5 breeding accessions of shallot, we selected a promising environmentally stable accession, D-57, which was noticeable for a high yield of green leaves (5.6 kg/m2) in combination with the highest general adaptive capacity (GAC = 1.3), high stability (bi = 0.4) and genomic breeding value (GBV = 2.7) for this trait. As to the adaptive potential for the "plant height" trait, the D-57 accessions also stood out; it was characterized by high general adaptive capacity (GAC = 1.3), relative stability (Sgi = 10.9 %) and genomic breeding value (GBV = 23.4). This accession was also the best in terms of the "plant weight": trait with the genomic breeding value (GBV = 42.4), it had the largest plant weight including a bulb (75.4 g), combined high general (GAC = 17.3) and specific adaptive capacity (SAC= 129.3) with high plasticity (bi = 2.6). Conclusions. The comprehensive study of the adaptive potential of 5 promising forms of shallots distinguished the D-57 accession, which was superior to the check variety, Lira, in terms of green leaf yield, plant height and weight (including a bulb) and had a high adaptive potential and genomic breeding value for these traits.