大豆花叶病毒(SMV)病显症率的模型预测

 大豆感染SMV系统量症前介体不能传毒。接种稀释10倍SMV病液显症率与介体传毒相似。介体和人工接种SMV于5个感病品种V₁-R₅ 9个生长时期共30余批次,结果表明SMV显症率主要决定于温度。显症起始温度为9℃,最适温度约26℃.V₁-R₂时期的植株显症所需有效积温基本一致;R₃-R₅时期比前者略有增加。累积显症率与累积有效积温的相关点图呈"S"型曲线分布,通过Weibull和Gompertz等8组曲线拟合选出拟合最优模型。V₁-R₂时期显症预测Gompertz拟合最好,得预测式:PP₁₁=Exp-103021.196×Exp(-0.1329TT₁)]R₃-R₅时期Weibull拟合最好,得预测式:PP₁₂=1-Exp{-0.02222(TT₁-65)^2.581]}

THE FORECASTING MODELS FOR THE RATE OF SYMPTOM APPEARANCE OF SOYBEAN MOSAIC VIRUS

In order to identify the persistence of the resistance of grapes to Plosmo-para viticola,the relation between the host and the pathogen was studied The specific inoculation of using 15 natural pathogen groupes and 5 host var-ieties showed that the pathogenecity of the natural groupes of the pathogen and the resistance of the host varieties were both differnet,but there was no specific interaction between the host and the Pathogen.The results showedthat although resistant host varieties might strenthen the pathogenecity of the pathogen groupes,continuous inoculation on specific varieties had not induced specific interaction.Consequently,horizontal theory was suqqested.If this the-ory will be proved,we may increase the resistance level of grapes to P,viti-cola by intraspecific hybridization of Uitis vinjfera.