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A Quantitative Genetic Study of Verticillium Wilt Resistance Among Selected Lines of Upland Cotton¹

A quantitative genetic study of the inheritance of resistance to verticillium wilt (Verticillium albo-atrum Reinke and Berth.) was conducted among 10 selected lines of upland cotton (Gossypium hirsutum L.) utilizing the Jinks-Hayman diallel analysis. Parents and F₁'s were studied in 1968 and 1969 at two locations in Oklahoma with the inclusion of F₂ progenies in the second year.

General tests of the diallel assumptions revealed a partial noncompliance with those assumptions in this material. Epistasis did not appear to be a complicating factor herein, but significant genotype by environment interactions were found among parents from year to year for their additive and dominance components of variation. A significant portion of the dominance interactions could not be attributed to either years or locations.

All estimates of environmental variance and of additive genetic variance were significant, as were most estimates of dominance genetic variance. With one exception, estimates of additive variance were larger than the other parameters estimated in the same test. Wilt resistance displayed partial dominance except in one environment where overdominance was found to occur. Direction of dominance was toward greater susceptibility. The frequency of negative versus positive alleles in the parents was likely unequal and biased towards greater susceptibility. Narrow-sense heritability estimates suggested that rapid genetic advances through selection could be made in most environments.

Key Words: Visual grades • Verticillium albo-atrum Reinke and Berth. • Gossypium hirsutum L. • Diallel analysis • Epistasis • Genotype by environment interaction • Dominance • Heritability

² Assistant Professor (Dept, of Agronomy); Plant Pathologist (Crops Research Division, A.R.S., U.S.D.A.) and Professor (Dept, of Botany and Plant Pathology); Graduate Student (Dept, of Agronomy); and Graduate Research Assistant (Dept, of Agronomy), respectively. Oklahoma State University, Stillwater, Okla. 74074.

Received for publication November 2, 1970.

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