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Inheritance of Resistance to Fusarium Wilt in Cotton¹

The inheritance of resistance to Fusarium oxysporum f. vasinfectum (Atk.) Snyd. & Hans. was investigated in seven families of cotton (Gossypium hirsutum L.). Each family contained P₁ P₂ F₁ F₂, F₃ B₁ and B₂ generations and each was evaluated in six different greenhouse tests. Plants were grown in fumigated soils and were artificially inoculated with known concentrations of inoculum.

Additive effects were significant in 34 of the 42 tests. Dominance effects were significant in two and epistatic effects were significant in eight tests; however, additive effects also were significant in each of those cases except one. Although estimates of additive effects were of much greater magnitude than were those of dominance or epistasis. it was not possible to draw direct inferences as to the relative importance of those effects, since they were made using the generation-mean analysis. In the families studied additive gene effects most satisfactorily explained the inheritance of resistance to fusarium wilt in cotton.

Key Words: Fusarium oxysporum f. vasinfectum • Gossypium hirsutum L • Additive effects • Dominance effects • Epistatic Effects

² Research Pathologist, Plant Science Research Division, ARS, USDA, in cooperation with the Dept, of Agronomy and Soils, Auburn Univ. Agr. Exp. Sta. Auburn, Ala. 36830.

Received for publication February 19, 1971.