大豆对SMV数量抗性的表现形式与种质鉴定

 在发现大豆对SMV具有数量抗性的基础上，选用96份大豆品种材料研究其在接种Sa、SC8、N1、N3等4个SMV株系条件下的发病率、病级、潜育期和病害扩展速度等4个数量抗性组分的变异。结果表明，品种间4个组分均存在明显差异；溧水中子黄豆、沛县天鹅蛋、诱变30等品种虽然对4个株系均感染，但在4个组分上均表现出较强抗性，且不同株系间差异较小，说明这些品种对大豆花叶病毒具有广谱数量抗性。研究证实以往报道的一些抗感染品种如溧水中子黄豆、AGS-19,其实是抗扩展的数量抗性品种。邳县茶豆、淮阴秋黑豆等品种对SMV的抗性可能属于数量抗性与质量抗性的叠和。大豆对SMV的数量抗性是曾被学术界忽视而又值得利用的一类抗性，它一般比质量抗性具有更宽的抗谱和更好的持久性。

Performances and Germplasm Evaluation of Quantitative Resistance to Soybean Mosaic Virus in Soybeans

A sample of 96 soybean cultivars were evaluated for their diseased rate (I), diseased rank (S), latent period (LP) and rate of disease development (R) in order to study the quantitative resistance to SMV in soybeans. The results showed that the performances of the above four resistance components were significantly different among cultivars and that some of the cultivars such as Lishuizhongzihuangdou, Peixiantianedan, Youbian30 could be infected by four SMV strains, Sa, SC8, N1 and N3, but their I, S, and R were lower and LP longer than most of the cultivars. These results demonstrated the existence of quantitative resistance to SMV besides qualitative resistance in soybeans. Some soybean cultivars such as Lishuizhongzihuangdou and AGS19, which previously were identified as resistant to SMV infection, were in fact susceptible, but resistant to expansion. The resistance to SMV in Pixianchadou and Huaiyinqiuheidou might be either qualitative or quantitative. The present study also indicated that the resistance spectrum and durability of cultivars with quantitative resistance might be wider and longer than those with qualitative resistance.