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脱落酸(ABA)在植物抗病反应中发挥重要的作用,而其如何调控植物与活体营养型病原真菌的相互作用还不清楚.拟南芥(Arabidopsis thaliana)ABA合成缺陷型突变体aba2-1和aba3-1对活体营养型病原真菌白粉菌(Golovinomyces cichoracearum)的抗性增强.外源ABA处理能够增加拟南芥对白粉菌的感病性.ABA受体组分的突变体abi1-1和abi2-1对白粉菌的抗性表型与ABA合成缺陷型突变体相似,而ABA信号转导下游组分的突变体abi3-1,abi4-1和abi5-1对白粉菌的抗性表型却与野生型相似.显微观察发现,在ABA合成缺陷型突变体中白粉菌侵染的穿透前和穿透过程都没有受到影响,但其穿透后菌丝的生长及分生孢子的产量都受到抑制.另外,还发现水杨酸和MPK3参与了ABA对白粉病抗性的调控.综上所述,本研究结果显示,ABA可能通过拮抗水杨酸抗病信号通路来负调控拟南芥对白粉菌的穿透后抗性.
Abscisic acid (ABA) plays an important role in plant disease resistance and how it regulates the interaction between plants and live-nutrient pathogenic fungi is unclear.Arabidopsis thaliana ABA synthesis-deficient mutant aba2-1 And aba3-1 on Golotinomyces cichoracearum.The exogenous ABA treatment can increase the susceptibility of Arabidopsis thaliana to powdery mildew.The abi1-1 mutant of ABA receptor and The resistant phenotype of abi2-1 against powdery mildew was similar to that of the ABA synthesis defective mutant, while the abi3-1, abi4-1 and abi5-1 mutants downstream of the ABA signal transduction against powdery mildew But similar to the wild type.The microscopic observation showed that the infection of powdery mildew was not affected before and during the penetration of ABA synthesis mutant but the growth and conidia In addition, it was found that salicylic acid and MPK3 are involved in ABA resistance to powdery mildew.In summary, the results of this study show that ABA may be negatively regulated by antagonizing salicylic acid resistance signaling pathways Post-resistance of Arabidopsis to powdery mildew.