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Resistance of interspecific cotton hybrids gossypium hirsutum x gossypium barbadense containing gossypium harknessii cytoplasm to fusarium wilt



Resistance of interspecific cotton hybrids gossypium hirsutum x gossypium barbadense containing gossypium harknessii cytoplasm to fusarium wilt



Plant Disease 69(4): 312-313



Analysis of progenies of crosses between the resistant cultivar Acala SJ-2 (G. hirsutum) and the susceptible cultivar Pima S-5 (G. barbadense) indicated that resistance to race 3 of Fusarium oxysporum f. sp. vasinfectum is controlled by a dominant gene. Crosses between breeding lines, male restorer and female (male sterile) parents, both on a background of G. harknessii cytoplasm, indicated that the resistance is not affected by the cytoplasm of the latter species. All but one of the 5 restorer lines tested with the G. barbadense genome were found susceptible to the fungus. Thus, a close linkage of genes conferring resistance and restoration of fertility is ruled out. In addition, the resistance of such a restorer line enables obtaining intraspecific as well as interspecific hybrids of cotton resistant to race 3 of the fungus.

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