Sources of Resistance to Peanut Mottle Virus inArachisGerm Plasm

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Abstract
The following peanut [A. hypogaea] accessions were not susceptible to peanut mottle virus (PMV) as determined by the absence of local lesions on inoculated plants of the bean [Phaseolus vulgaris] cv. Topcrop: Rhizomatosae section PI [plant introduction] 468171, PI 468174, PI 468363, PI 468366 and PI 468371; Arachis section PI 468141 and PI 468142 (both A. diogoi); and PI 468169 (Arachis sp.). Leaves on shoots of these peanut entries and of the susceptible cv. Tamnut 74 were mechanically inoculated with a severe PMV strain. Leaves from each shoot were tested for virus infection 3-4 wk after inoculation. All entries were negative for the virus on the basis of symptoms, local-lesion assays on ''Topcrop'' bean, serology and EM. The control ''Tamnut 74'' shoots were infected in each case. This is the 1st report of PMV resistance in any species within the Arachis section.