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Published in Crop Sci 13:608-611 (1973)
© 1973 Crop Science Society of America
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Locating Genes for Maize Dwarf Mosaic Resistance by Means of Chromosomal Translocations in Corn (Zea mays L.)1

W. R. Findley, E. J. Dollinger, Raymond Louie and J. K. Knoke2

Chromosomal translocations were used to locate genes for resistance to the maize dwarf mosaic virus disease (MDM) in corn (Zea mays L.) inbreds Oh07 and Mo22. The translocations were converted to inbred M14 background, which is susceptible to MDM. Each chromosome arm of the resistant inbreds was tested at least once during 1968 or 1969, under conditions of natural infection near Portsmouth, Ohio. The data indicated that genes for resistance common in Oh07 and Mo22 were located in both arms of chromosome 6; the long arms of chromosomes 1 and 2; possibly the long arm of chromosome 10; and the short arms of chromosomes 3, 7, 8, and 10. A gene(s) for resistance was associated with the long arm of chromosome 7 in Mo22 but not in Oh07. Major genes for resistance in Oh07 were associated with both arms of chromosome 6 and the short arm of chromosome 8. Other associations of importance were with the long arm of chromosome 1 and the short arms of chromosomes 3 and 10. In Mo22 there is some evidence for a major gene hi the short arm of chromosome 10. It is suggested that different genetic systems control resistance to the various virus strains comprising the MDM complex, but the systems probably have some genes in common.

Key Words: Interchanges • Virus • Genetics • Disease • Inheritance

1 Cooperative investigations of the Agricultural Research Service, USDA, and the Ohio Agricultural Research and Development Center, Wooster, Ohio 44691.

2 Research Agronomist, ARS, USDA; Professor, Dept, of Agronomy, Ohio Agricultural Research and Development Center; and Research Plant Pathologist and Research Entomologist, ARS, USDA, Wooster, Ohio 44691.

Received for publication February 12, 1973.




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