The seeds and plants of cotyledon,one-leaf stage,three-leaf stage were treated with 0.2-0.8 mmol/L exogenous salicylic acid (SA) to study the effect of SA on the clubroot incidence of pak-choi and the growth of infected plant,and evaluate the feasibility of exogenous SA on the prevention and control of clubroot,taking pak-choi variety'Xin'aiqin'as material.The results showed that the appropriate concentration of exogenous SA can reduce the clubroot incidence and disease index,and relieve the growth inhibition of pak-choi.There were dose effect of different treatment period,the optimal SA concentrations in seed,cotyledon,one-leaf stage,three-leaf stage were 0.8 mmol/L,0.4 mmol/L,0.6 mmol/L,0.6 mmol/L respectively.Comprehensive analysis of the clubroot incidence and infected plants growth indicated that the best inhibitory effect on pak-choi clubroot is 0.6 mmol/L SA at one-leaf stage.%以不结球白菜‘新矮青’为试材,在种子、子叶期、一叶一心期、三叶一心期灌施外源水杨酸(SA),研究0.2-0.8 mmol/L SA对不结球白菜植株根肿病发病和感病植株生长的影响,探讨外源SA防治不结球白菜根肿病的可行性.结果表明:适宜浓度的外源SA能够不同程度降低根肿病的发病率和病情指数,缓解感病不结球白菜生长的抑制作用.不同处理时期均存在剂量效应,种子、子叶期、一叶一心期、三叶一心期的最佳SA处理浓度分别为0.8 mmol/L、O.4 mmol/L、0.6 mmol/L、0.6 mmol/L.综合分析各处理组合下植株发病情况和感病植株生长情况,认为一叶一心期0.6 mmol/L SA对不结球白菜根肿病的抑制效果最好.
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