COMBINING ABILITY OF YIELD AND YIELD COMPONENTS IN UPLAND COTTON (G. hirsutum L.) GENOTYPES UNDER NO

Cotton is the most important crop in Uzbekistan's agricultural industry. In recent years, water scarcity in Central Asia has diminished the likelihood of high cotton production. Selection and development of high-yielding cotton varieties, even in drought conditions, is one of today's most pressing challenges. The combined ability of Omad, Ishonch varieties, L-490, L-501, Determinant-2, Determinant-3 lines, and their F1 hybrids of G. hirsutum L. cotton in terms of production and productivity components was tested under ideal settings with sufficient water and in water stress situations. In this scenario, under water stress, average indicators of seed production, single boll weight, 100 seed weight, lint percentage, and lint index attributes in all genotypes investigated decreased to varying degrees as compared to optimal irrigation conditions. The importance of additive genes in the development of productivity, single boll weight, lint yield, and lint index traits in normal and low water supply regimes is demonstrated by the fact that the general combining ability (GCA) of genotypes is higher than the specific combining ability (SCA) variance. In addition, suitable parental genotypes and prospective hybrids for improving cotton output characteristics in drought situations were discovered. In this regard, Omad and Ishonch cultivars can be used in future selection-breeding works based on seed cotton yield, single boll weight, and lint percentage traits, L-490 line, Omad x Determinant-2 and Ishonch Determinant-2 hybrids based on lint index and 100 seed weight trait, and L-490 line, Omad x Determinant-2 and Ishonch Determinant-2 hybrids based on lint

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