Determination of Different Cotton Genotypes and Their F1 Hybrids Resistance to Verticillium Disease (Verticillium dahliae Kleb.) in Field and Greenhouse Experiments

This study aimed to determine the resistance of different cotton genotypes and their F1 hybrids against Verticillium Wilt (Verticillium dahliae Kleb.) under natural field conditions and in controlled greenhouse environments. A total of 15 F1 hybrids and 8 parental lines, developed through the line x tester hybridization method, were used as experimental material. Field and greenhouse experiments allowed for the assessment of foliar disease severity values across the population, leading to the determination of resistance levels, as well as the general combining ability (GCA) values for the parents and special combining ability (SCA) values for the hybrid combinations. The results of both experiments indicated that the DPL 5690 and Acala Maxa varieties could serve as resistant parent lines in future breeding programs. Among the F1 hybrids, the combinations of Sg 125 x Acala Maxa, Stn 8a x Acala Maxa, Nazilli 84 x Acala Maxa, and DPL 5690 x Acala Maxa were identified as suitable for transferring resistance to Verticillium dahliae Kleb. to subsequent generations. Additionally, the results indicated that resistance levels for the same cotton genotype may vary between greenhouse and field conditions.