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Genetics of Resistance of Two Dent Corn Inbreds to Maize Dwarf Mosaic Virus and Transfer of Resistance into Sweet Corn. M. A. Mikel, Former graduate student, Department of Plant Pathology, University of Illinois, Urbana 61801; Cleora J. D' Arcy(2), A. M. Rhodes(3), and R. E. Ford(4). (2)(4)Assistant professor, and professor and head, respectively, Department of Plant Pathology, University of Illinois, Urbana 61801; (3)Professor emeritus, Department of Horticulture, University of Illinois, Urbana 61801. Phytopathology 74:467-473. Accepted for publication 16 November 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-467.

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 Pa405, B68, Oh1EP, and Ga209 was 97, 61, 69, and 0%, respectively, of the plants tested. Based on three years' data from F2 [(sweet corn Pa405)F2] and testcross [sweet corn (sweet corn Pa405)F1] progeny, we estimated that three genes controlled resistance to MDMV. For effective resistance, one gene must be present with either of the other two. For F2 and testcross progeny of (sweet corn B68) F2 and sweet corn (sweet corn B68)F1, respectively, three genes were required for MDMV resistance. With selfing and selection of resistant plants from two-way (sweet corn Pa405), three-way [sweet corn (sweet corn Pa405)F1], and delayed three-way [sweet corn (sweet corn Pa405)Fx] crosses we have obtained homozygously resistant sweet corn lines.