Phenotypic Response of Six Soybean Cultivars To Bean Pod Mottle Virus Infection

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Abstract
Response of 6 soybean cultivars to infection by bean pod mottle virus was monitored during 2 growing seasons for chlorotic leaf area, lef rugosity canopy width and height reduction. Symptoms were most severe on the cultivars Centennial and/or Forrest and mildest on Davis. Yield losses ranged from 3-13% and 4-10% in 1981 and 1982, respectively. Yield reductions were correlated (P = 0.05) with both chlorotic leaf area and leaf rugosity (r = 0.998 and 0.961 in 1981, and r = 0.910 and 0.928 in 1982, respectively). Bean pod mottle virus-inoculated cultivars Ransom and Centennial had greater leaf chlorophyll concentrations after flowering than uninoculated plants, whereas chlorophyll concentrations in David did not vary between inoculated and uninoculated plants. Plants inoculated the 2-leaf stage (V2) developed the most severe symptoms, whereas the mildest symptoms developed in plants inoculated at the V9 growth stage. Degree of symptom expression of inoculated, greenhouse-grown plants during the winter differed from that of the characteristic symptoms developed by plants of the same cultivars when field grown. Cultivars York and NC-PMR were also used.