大豆花叶病毒一强株系在抗性不同大豆品种上的症状及病毒浓度

THE SYMPTOMS AND CONCENTRATION OF A SEVERE SMV STRAIN IN SOYBEAN CULTIVARS WITH DIFFERENT DEGREE OF RESISTANCE

用枯斑寄主菜豆品种Top Crop测定了大豆花叶病毒(SMV)一强株系在3个抗性基因不同的大豆品种内的病毒浓度。结果表明:SMV在感病品种合丰25(r_1r_2r_3),中抗品种铁丰18(R_1r_2r_3)内的病毒浓度相同(P>0.05),高抗品种诱变30(R_1R_2r_3)内的病毒浓度显著低于感病品种合丰25(P<0.05)。中抗品种铁丰18与高抗品种诱变30内的病毒浓度无差异(P>0.05)。症状调查结果表明:SMV侵染大豆不同品种产生的症状,与大豆体内的病毒浓度无关。试验结果揭示:大豆花叶病毒与大豆品种的相互作用中,症状反应是SMV株系与大豆品种的特异组合,大豆品种对某一小种抗性并不一定代表其田间抗性。

The concentration of a severe SMV strain in three different soybean cultivars were measured by local lesion assay. The result shows that the concentration of the severe strain in susceptable cultivar Hefeng 25 and moderate resistant cultivar Tiefeng 18 are similar,(P>0.05) . so were in moderate resistant cultivar Tiefeng 18 and highly resistant cultivar You bian 30. But, the concentration of the severe strain in susceptable cultivar Hefeng 25 is higher than highly resistant cultivar Youbian 30, significantly, (P>0.05) . There is no correlation between SMV concentration and symptom. This experiment also shows that soybean cultivar's specific resistance to a certain strain did not certainly represents its field resistance.