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Inheritance of Resistance to Goss's Wilt in Maize

Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706

^* Corresponding author.

Resistant genotypes are the best means of control for Goss's wilt (Corynebacterium micMganense ssp. nebraskense Schuster, Hoff, Mandel, and Lazar) of maize (Zea mays L.). The purpose of this study was to identify susceptible and resistant genotypes and to determine the inheritance of resistance to Goss's wilt using generation means analysis and diallel experiments. Thirty-nine inbred lines were screened for resistance to Goss's wilt. Sixteen were susceptible, 15 intermediate, and 8 resistant. Four experiments, two generation mean analyses (GMA), and two diallels were used to investigate the inheritance of Goss's wilt. One GMA experiment consisted of the resistant inbred Mol7Ht, the susceptible inbred A634Ht, the F₁, F₂, and the F₁ backcrossed to both parents. A second GMA experiment involved resistant MolTHt, susceptible CM105, the F₁, F₂, and the F₁ backcrossed to both parents. One diallel had five parents and one six. Additive gene action was important in the generation mean analyses for resistance to Goss's wilt. Year effects and the generations x years interaction were highly significant. In the diallel experiments, general combining ability was highly significant for both, demonstrating the importance of additive gene effects. General combining ability and specific combining ability sums of squares accounted for 97.7 and 2.3% of the variation among crosses, respectively, in the first diallel, and for 91.0 and 9.0% in the secondiallel. The results suggest that recurrent selection should be effective among the maize lines tested for resistance to Goss's wilt in maize.

Received for publication January 20, 1989.