钾素对番茄青枯病抗性的影响及机理研究

Effect of Potassium on Tomato Bacterial Wilt Resistance and Its Mechanism

[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H_2O_2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H_2O_2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 wascarried out with 4 different gradients of potassium nutrition. Effect of potassium on the growth and nutrient absorption of tomato was studied ,and ater inoculation with Ralstonia solanacearum , incidence of bacterial wilt , H 2 〇 2 concentration , P O D and P Pwere analyzed. [Result] Results showed that increased potassium concentration could reduce the incidence of tomato bacterial wilt. Potassiumnutrition could promote tomato growth and absorption and of potassium. At the same time , tassium could also promote the synthesis of H 2O2 and accumulation of POD and P P O in tomato leaves. [ Conclusion] Potassium could reducethe occurrence of tomato bacterial wilt by promoting tomato growth , potassium absorption and physiological resistance enzyme activity.