期刊
FRONTIERS IN PLANT SCIENCE
卷 13, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2022.860170
关键词
Rhizoctonia solani AG1-IA; EG1; gamma aminobutyric acid transaminase; allergic necrosis; disease resistance
资金
- Ministry of Science and Technology of China [2015BAD15B05, 2012AA10180402]
- National Nature Science Foundation of China [31571949]
In this study, a GABA-T enzyme, ZmGABA-T, was identified in Zea mays that interacts with a cell wall-degrading enzyme EG1, and it was found to inhibit allergic necrosis induced by EG1 and provide resistance to R. solani infection.
Corn sheath blight, caused by AG1-IA, a fusion group of Rhizoctonia solani, which acts as a kind of necrotrophic fungal pathogen, poses a global threat to the production of Zea mays. Although cellulase plays a crucial role in R. solani infections, how plants respond to it is still poorly understood. In this study, we identified a gamma-aminobutyric acid transaminase (GABA-T), ZmGABA-T, in Z. mays that interacts with a cell wall-degrading enzyme (CWDE), EG1, in the cell membrane, using yeast two-hybrid assay, co-immunoprecipitation (Co-IP), and bimolecular fluorescence complementation assays. We found that the combination of EG1 and ZmGABA-T suppressed the allergic necrosis induced by EG1. We also found that the substrate of GABA-T-GABA, can inhibit the transcription of EG1. Transient expression of ZmGABA-T inhibited R. solani infection in Nicotiana benthamiana. The homolog in Otyza sativa, OsGABA-T, could also interact with EG1 to suppress the allergic necrosis induced by EG1. The OsGABA-T knocked out plants displayed enhanced susceptibility to R. solani and showed larger lesions. In conclusion, our results suggest that ZmGABA-T inhibits allergic necrosis induced by EG1 based on the combination with EG1, producing resistance to R. solani infection.
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