Abstract:

Soybean mosaic virus (SMV) is one of the most broad-distributed and destructive diseases of soybeans in China. It causes severe yield loss and seed quality deficiency. Studies on performances and inheritance of resistance in infection (RI) to SMV have been reported. However, resistance in development (RD) to SMV was not reported until Dongfang described it in his PhD dissertation. Recent studies have demonstrated that the mechanisms of resistance in infection and in development to SMV are different. Some cultivars with RI or RD to SMV have been screened out. In the present study, ten crosses between materials with RI or RD in different degree were used to reveal the inheritance of resistances. The results showed that the resistances in infection and in development were controlled by different genetic systems: the former by a single dominant gene, while the latter by one additive major gene plus additive-dominant polygenes. The heritability values of resistance in development were about 90%, those of major and polygene were 23.91%－74.97% and 18.43%－37.04% in F₂, and 49.46%－82.42% and 17.42%－39.93% in F_2∶3, respectively. Both kinds of resistance can be used in soybean improvement. For utilizing resistance in development, attention should be paid to using high resistant parent and major gene selection in breeding programs.

Key words: Soybean, Soybean mosaic virus, Resistance in infection, Resistance in development, Inheritance