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Inheritance of Resistance to Maize Dwarf Mosaic Virus¹

We determined the inheritance of host resistance to MDMV for the inter se crosses among 10 inbred lines of corn (Zea mays L.). Trials were conducted in 2 years at two locations. Diallel analyses indicated that the general combining ability and the specific combining ability mean squares were statistically significant, but that the gca mean square was substantially larger than the sca mean square. Differences in MDM scores were noted between years and locations. Our results agree rather well with previous studies based on diallel analysis and generation mean analysis. Previous studies indicated that disease symptoms are expressed more intensely when competition from johnsongrass (Sorghum halepense L.) Pers., as well as from other forms of environmental stress, becomes extreme. Also, host reaction to MDMV is confounded with hybrid vigor. We conclude that these sources of bias would be minimized by evaluating F₁ hybrids.

Key Words: Diallel analysis • Genetic variance

² Geneticist and Research Agronomist, respectively, PSRD, ARS, USDA; and Associate Professor and Professor of Agronomy, respectively, University of Missouri Columbia, Mo. 65201.

Received for publication November 17, 1971.