Advances in Researches on Inheritance of Verticillium dahliae Kleb.and Resistance Breeding in Cotton

Advances of researches on the inheritance of Verticillium dahliae Kleb. and the resistance breeding was summarized. The mechanism of virulence of Verticillium dahliae to cotton is that the vascular bundle is jammed by the mycelium, spore of Verticillium dahliae and callose produced by cotton plant. The other mechanism is the effect of wilt toxin secreted by Verticillium dahliae. The inheritance of verticillium wilt resistance was argued. In general, the inheritance of Verticillium wilt resistance is controlled by main gene when inoculated by single race, while it is controlled by quantitative genes when inoculated by mixed races. The breeding for Verticillium wilt resistance is difficult because lacking of germplasm resistant to Verticillium dahliae. In 1990s, cotton varieties resistant to Verticillium dahliae, such as 86 6, Chuan737, Chuan2802, Yumian19 and Yumian21, have been bred and released. These varieties play important role in the prevention of Verticillium wilt.