[目的]探究钾素对番茄青枯病抗性的影响.[方法]通过水培试验研究4个不同浓度钾素对番茄生长和养分吸收的影响,并在接种青枯菌后,统计不同处理青枯病的发病情况,分析番茄叶片H2 O2浓度、过氧化物酶(POD)和多酚氧化酶(PPO)活性变化.[结果]提高钾营养浓度能够减轻番茄青枯病发病情况,钾素能够促进番茄的生长及对钾的吸收利用,在接种青枯菌后,钾素还能促进番茄叶片H2 O2的合成,并提高叶片POD和PPO活性.[结论]钾素营养能够降低番茄青枯病的发生,钾素营养通过促进番茄的生长、钾素的吸收及生理抗性酶活性进而增强了对番茄青枯病的抗性.%[Objective] The aim was to study effect of potassium on tomato bacterial wilt resistance.[ Method] Hydroponic experiment was carried out with 4 different gradients of potassium nutrition.Effect of potassium on the growth and nutrient absorption of tomato was studied, and after inoculation with Ralstonia solanacearum, incidence of bacterial wilt, H2 O2 concentration, POD and PPO activities in tomato leaves were analyzed.[ Result] Results showed that increased potassium concentration could reduce the incidence of tomato bacterial wilt .Potassium nutrition could promote tomato growth and absorption and of potassium.At the same time, after inoculation with Ralstonia solanacearum, potassium could also promote the synthesis of H2O2 and accumulation of POD and PPO in tomato leaves.[Conclusion] Potassium could reduce the occurrence of tomato bacterial wilt by promoting tomato growth, potassium absorption and physiological resistance enzyme activity.
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