Genetics of Resistance of Two Dent Corn Inbreds to Maize Dwarf Mosaic Virus and Transfer of Resistance into Sweet Corn

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Abstract
Based on inoculation tests, dent corn inbreds Pa405, B68, Oh1EP, and Ga209 are good sources of resistance to maize dwarf mosaic virus (MDMV). When the other inbreds were crossed to Pa405, little or no segregation for resistance to MDMV was observed in the F1 or F2 progeny. In crosses to sweet corn susceptible to MDMV, resistance to MDMV in the F1 hybrids of sweet corn .times. Pa405 .times. B68 .times. Oh1EP, and .times. Ga209 was 97, 61, 69 and 0%, respectively, of the plants tested. Three-year data from F2 [(sweet corn .times. Pa405)F2] and testcross [sweet corn .times. (sweet corn .times. Pa405)F1] progeny indicated that 3 genes controlled resistance to MDMV. For effective resistance, 1 gene must be present with either of the other 2. For F2 and testcross progeny of (sweet corn .times. B68)F2 and sweet corn .times. (sweet corn .times. B68)F1, respectively, 3 genes were required for MDMV resistance. With selfing and selection of resistant plants from 2-way (sweet corn .times. Pa405), 3-way [sweet corn .times. (sweet corn .times. Pa405)F1], and delayed 3-way [sweet corn .times. (sweet corn .times. Pa405)Fx] crosses, homozygously resistant sweet corn lines were obtained.

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