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Infection of Soybean with Soybean mosaic virus Increases Susceptibility to Phomopsis spp. Seed Infection

^a Dep. of Agronomy, Univ. of Kentucky, Lexington, KY 40546
^b Dep. of Plant Pathology, Univ. of Kentucky, Lexington, KY 40546

View larger version (49K): [in a new window]   Fig. 1. Effects of Soybean mosaic virus (SMV) (strain G2) infection at different stages of plant development on (a) SMV in seedcoats, and b) Phomopsis spp. seed infection, at different stages of seed maturation, 1995 to 1997. Averages across genotypes from apical seeds are shown in 1995, and averages of apical and basal seeds are shown in 1996 and 1997. Bars with different letters, within years and response variables, are significantly different at the 0.05 probability level. Variables in y-axis are not of the same magnitude. FS, full seed; YP, yellow pod; HM, harvest maturity; nd, not detected; R-NI, resistant isolines (L78-434, L78-379) not inoculated with SMV; S-NI, S-V4, S-V8 and S-R2, susceptible cultivars (Clark, Williams) not inoculated with SMV, or inoculated with SMV at V4, V8 or R2 growth stages.

View larger version (25K): [in a new window]   Fig. 2. Relationship between the incidence of Phomopsis spp. seed infection and the concentration of Soybean mosaic virus (SMV) antigen (strain G2) in seedcoats at yellow pod () and harvest maturity () in a) 1996 (n = 60) and b) 1997 (n = 120). Data averaged across apical and basal seeds, and regressed across all the SMV-inoculation treatments received by two SMV-susceptible cultivars (Clark, Williams) and their SMV-resistant isolines (L78-434, L78-379).