苗期喷施钾离子对小麦条锈病的影响

目的]为钾离子在作物抗病中的应用提供参考。方法]以小麦品种铭贤169为材料,对其1叶1心期的幼苗接种条锈病菌,分别在接菌前24 h、接菌后24 h和接菌后3、7 d对其喷洒1.75、3.50、5.25、7.00 mmol/L氯化钾,接菌12 d后调查发病情况。结果]接菌前24 h喷氯化钾的处理小麦幼苗的病情指数极显著高于对照（P〈0.01）;接菌后24 h,3.50、5.25、7.00 mmol/L氯化钾处理的小麦幼苗病情指数比对照低18.73%-25.25%,对条锈病的防效为30.30%-40.69%;接菌后3 d,1.75、3.50 mmol/L氯化钾处理的小麦幼苗病情指数极显著低于对照（P〈0.01）,对条锈病的防效为17.14%-18.57%;接菌后7 d,1.75、3.50、5.25 mmol/L氯化钾处理的小麦幼苗病情指数显著低于对照（P〈0.05）,对条锈病的防效为20.25%-39.48%。结论]钾离子抑制小麦条锈病的最佳浓度为1.75-5.25mmol/L。

Effects of Spraying Potassium Ion on Wheat Stripe Rust in Seedling Stage

Objective] The aim was to provide the reference for application of potassium ion in crop disease-resistant.Method] With wheat variety Mingxian 169 as the material,its seedling was inoculated stripe rust pathogen in a-leaf-a-heart stage,and then the seedling were treated with potassium chloride(1.75,3.50,5.25,7.00 mmol/L) at 24 h before pathogen inoculation,24 h after pathogen inoculation,3,7 d after pathogen inoculation resp.and then the prevalence situation were investigated after 12 d of pathogen inocul...