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Soybean mosaic virus (SMV) and the SMV Resistance Gene (Rsv₁)

Influence on Phomopsis spp. Seed Infection in an Aphid Free Environment

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

View larger version (29K): [in a new window]   Fig. 1. Effects of SMV (strain G2) infection at the V8 growth stage in caged hill plots (Expt. I), on the accumulation of SMV in seedcoats in (a) 1996 and (b) 1997, and the incidence of Phomopsis spp. seedcoat infection in (c) 1996 and (d) 1997, at yellow pod and harvest maturity. Data averaged across apical and basal seeds of two genotypes. Rsv1-MI, resistant isolines (L78-434, L78-379) mechanically inoculated with 0.05 M potassium phosphate buffer (mock inoculation); S-MI, SMV susceptible cultivars (Clark, Williams) mechanically inoculated with 0.05 M potassium phosphate buffer (mock inoculation); S-SMV, SMV susceptible cultivars mechanically inoculated with the G2; ND, not detected by ELISA. Bars with different letters, within each year and response variable, are significantly different at the 0.05 probability level.

View larger version (26K): [in a new window]   Fig. 2. Relationship between the incidence of Phomopsis spp. seed infection and the concentration of SMV (G2 strain) antigen (Expt. I) in seedcoats, at yellow pod and harvest maturity in (a) 1996 and (b) 1997. Averaged across apical and basal seeds (n = 20), and regressed across individual plots of all SMV inoculation treatments of two SMV susceptible cultivars (Clark, Williams) and their SMV resistant isolines (L78-434, L78-379). **, *** Significant at the 0.01 and 0.001 probability levels, respectively.

View larger version (55K): [in a new window]   Fig. 3. Effects of SMV (strain G6) infection at the V8 growth stage, in caged-hill plots (Expt. II) in 1997, on the amount of SMV in seedcoats at (a) yellow pod and (b) harvest maturity; and the incidence of Phomopsis spp. seed infection at (c) yellow pod and (d) harvest maturity. Data averaged across apical and basal seeds. MI, mock inoculation (0.05 M potassium phosphate buffer); SMV-G6, mechanically inoculated with G6 strain of SMV, at the V8 growth stage; Clark, SMV susceptible cultivar; 10-rsv1y and 18-rsv1y, SMV resistant lines (with recessive rsv1y allele conferring resistance to SMV strains G1-G3); ND, not detected by ELISA. Bars with different letters are significantly different at the 0.05 probability level.