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Published in Agron J 59:423-426 (1967)
© 1967 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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An Inheritance Study of Resistance to Maize Dwarf Mosaic Virus in Corn (Zea mays L)1

P. J. Loesch, Jr. and M. S. Zuber2

The inheritance of host response to maize dwarf mosaic virus was studied under natural field conditions. Inbred lines 38-11 (moderately resistant) and H55 (susceptible) and their F1, F2, BC1, and BC2 progenies were evaluated at two testing sites. Numerous variables, including the possible confounding effect of the presence of additional viruses inciting stunting in corn, prevented a valid classical Mendelian analysis. Genetic ratios proved meaningless due to substantial variation in disease scores even in true-breeding entries. However, resistance appeared to be partially dominant, and indirect evidence from other studies in Missouri indicate that (1) resistance is due to more than one gene, or (2) the host plants respond differentially to a heterogeneous virus population.

Artificial inoculations of corn with pure isolates of maize dwarf mosaic virus are recommended for the determination of genetic ratios and gene numbers associated with resistance. But for experiments in the field in which the objectives are to determine the level of resistance and dominance relationships, diallel mating schemes employing F1 hybrids are recommended.

Key Words: gene action • heterosis

1 Contribution of Crops Research Division, ARS, USDA, and the Department of Field Cops, Project 579, Missouri Agricultural Experiment Station. Journal Series No. 5060.

2 Geneticist and Research Agronomist, ARS, USDA, and Assistant Professor and Professor of Field Crops, University of Missouri. The authors acknowledge the generous assistance of Dr. A. J. Keaster.

Received for publication March 15, 1967.




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Copyright © 1967 by the American Society of Agronomy.