XVI International Botanical Congess

Infectivity accumulation and distribution of antigen of middle pathogenic strain of soybean mosaic virus (SMV) of susceptible and extremely resistant soybean (Glycine max L. Merr.) cultivars, has been investigated during 7 weeks after inoculation. The Infectivity was not found in all leaves of extremely resistant in contradiction to susceptible plants. The absence of infectivity may be explained by presence of nonspecific virus inhibitors. The leaf juice of extremely resistant cv. inhibited tobacco mosaic virus infectivity to more extent in comparison with the juice of sensitive cv. (92+ 1%, 78+ 3% respectively). SMV antigen was detected in inoculated and top leaves of extremely resistant plants (in 3 and 7 weeks after inoculation respectively). These data testify that SMV antigen has been accumulated and transported in extremely resistant soybean plants.