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Disease response of sweet corn zea mays hybrids derived from dent corn resistant to maize dwarf mosaic virus



Disease response of sweet corn zea mays hybrids derived from dent corn resistant to maize dwarf mosaic virus



Phytopathology 72(6): 601-604



Six sweet corn hybrids developed from a maize dwarf mosaic virus (MDMV)-resistant dent corn inbred were examined under greenhouse conditions for resistance to MDMV strains A and B. All hybrids responded to virus inoculation with a reduced rate of symptom development and some hybrids showed a lower disease incidence compared to plants with susceptible dent or sweet corn germ plasm. The altered disease response was most apparent in the sweet corn hybrid, Cr288 .times. Cr290. This hybrid developed symptoms in 14-28 days with a 50-100% disease incidence whereas susceptible hybrids invariably developed a 100% disease incidence within 7 days. In addition, at an early stage of infection, the level of virus was significantly lower in the 6 hybrids when compared to susceptible hybrids. The virus-host interaction characteristic of this sweet corn germ plasm is correlated with the expression of disease resistance in dent corn. These hybrids might serve as a potential source of resistance to MDMV.

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Accession: 005169179

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