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The Journal of Heredity 1989:80(5):351-356
© 1989 The American Genetic Association 80:351-356

research-article

Genetic Studies of Resistance in Maize (Zea mays L.) to Goss's Bacterial Wilt and Blight (Clavibacter michiganense ssp. nebraskense)

T. R. Rocheford, C. O. Gardner, and A. K. Vidaver

Department of Agronomy, University of Nebraska
Department of Plant Pathology, University of Nebraska

Address reprint requests to Dr. Rocheford, Department of Agronomy, University of Illinois, Urbana, IL 61801

Abstract

Goss's bacterial wilt and blight, which is caused by Clavibacter michiganense ssp. nebraskense, is a foliar and vascular disease of maize (Zea mays L.). This disease, first reported in central Nebraska in 1969, has spread throughout a major portion of the northern Corn Belt. As little was known about the inheritance of resistance to this disease, we used interchange (chromosomal reciprocal translocation) stocks to identify chromosome arms with genes affecting resistance to C. m. ssp. nebraskense. A series of chromosome 9 waxy endosperm-marked interchange stocks in the resistant inbred M14 were crossed onto the susceptible inbred A632. Test-cross and F2 progenies were separated by endosperm markers, inoculated with C. m. ssp. nebraskense, and scored for disease reaction in field and greenhouse environments. Chi-square tests indicated a significant association of endosperm type and disease reaction more consistently for plants testing interchange 4S.53-9L.26 than for other interchanges, strongly suggesting the presence of a gene for resistance to C. m. ssp. nebraskense on chromosome arm 4S. We obtained additional data supportive of the location of a gene for resistance on 4S from F2 progeny involving A632 interchange 4S.36-6S.NOR among tests involving a series of chromosome 6 yellow endosperm marked interchange stocks. Additional chromosome arms also may have genes for resistance.


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