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Overexpressing the N-terminus of CATALASE2 enhances plant jasmonic acid biosynthesis and resistance to necrotrophic pathogen Botrytis cinerea B05.10
Molecular Plant Pathology ( IF 4.8 ) Pub Date : 2021-07-10 , DOI: 10.1111/mpp.13106
Yu Zhang 1 , Ru-Feng Song 1 , Hong-Mei Yuan 2 , Ting-Ting Li 3 , Lin-Feng Wang 1 , Kai-Kai Lu 1 , Jia-Xing Guo 1 , Wen-Cheng Liu 1
Affiliation  

Salicylic acid (SA) acts antagonistically to jasmonic acid (JA) in plant immunity. We previously reported that CATALASE2 (CAT2) promotes JA-biosynthetic acyl-CoA oxidase (ACX) activity to enhance plant resistance to necrotrophic Botrytis cinerea, and SA represses JA biosynthesis through inhibiting CAT2 activity, while the underlying mechanism remains to be further elucidated. Here, we report that the truncated CAT2 N-terminus (CAT2-N) interacts with and promotes ACX2/3, and CAT2-N-overexpressing plants have increased JA accumulation and enhanced resistance to Bcinerea B05.10, but compromised antagonism of SA on JA. Catalase inhibitor treatment or mutating CAT2 active amino acids abolished CAT2 H2O2-decomposing activity but did not affect its promotion of ACX2/3 activity via interaction. CAT2-N, a truncated protein with no catalase activity, interacted with and promoted ACX2/3. Overexpressing CAT2-N in Arabidopsis plants resulted in increased ACX activity, higher JA accumulation, and stronger resistance to Bcinerea B05.10 infection. Additionally, SA dramatically repressed JA biosynthesis and resistance to Bcinerea in the wild type but not in the CAT2-N-overexpressing plants. Together, our study reveals that CAT2-N can be utilized as an accelerator for JA biosynthesis during plant resistance to Bcinerea B05.10, and this truncated protein partly relieves SA repression of JA biosynthesis in plant defence responses.

中文翻译:

过表达 CATALASE2 的 N 末端可增强植物茉莉酸的生物合成和对坏死性病原体 Botrytis cinerea B05.10 的抗性

水杨酸 (SA) 在植物免疫中与茉莉酸 (JA) 具有拮抗作用。我们之前报道过 CATALASE2 (CAT2) 促进 JA 生物合成酰基辅酶 A 氧化酶 (ACX) 活性以增强植物对坏死性灰霉病的抗性,而 SA 通过抑制 CAT2 活性来抑制 JA 生物合成,而其潜在机制仍有待进一步阐明。在这里,我们报告截短的 CAT2 N 末端 (CAT2-N) 与 ACX2/3 相互作用并促进 ACX2/3,过表达 CAT2-N的植物增加了 JA 积累并增强了对B的抗性。 cinerea B05.10,但减弱了 SA 对 JA 的拮抗作用。过氧化氢酶抑制剂处理或突变 CAT2 活性氨基酸消除了 CAT2 H 2 O2-分解活性,但不影响其通过相互作用促进 ACX2/3 活性。CAT2-N 是一种没有过氧化氢酶活性的截短蛋白,与 ACX2/3 相互作用并促进 ACX2/3。在拟南芥植物中过表达CAT2-N导致 ACX 活性增加、JA 积累量增加和对B的抗性更强。 灰霉病B05.10 感染。此外,SA 显着抑制了 JA 的生物合成和对B的抗性。 野生型中的灰霉病,但在CAT2-N过表达植物中没有。总之,我们的研究表明,在植物对B的抗性过程中,CAT2-N 可用作 JA 生物合成的促进剂。 cinerea B05.10,这种截短的蛋白质部分缓解了植物防御反应中 JA 生物合成的 SA 抑制。
更新日期:2021-09-12
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