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Zheng Y, He S, Cai W, Shen L, Huang X, Yang S, Huang Y, Lu Q, Wang H, Guan D, He S. CaAIL1 Acts Positively in Pepper Immunity against Ralstonia solanacearum by Repressing Negative Regulators. PLANT & CELL PHYSIOLOGY 2021; 62:1702-1717. [PMID: 34463342 DOI: 10.1093/pcp/pcab125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 08/09/2021] [Accepted: 08/28/2021] [Indexed: 06/13/2023]
Abstract
APETALA2 (AP2) subfamily transcription factors participate in plant growth and development, but their roles in plant immunity remain unclear. Here, we discovered that the AP2 transcription factor CaAIL1 functions in immunity against Ralstonia solanacearum infection (RSI) in pepper (Capsicum annuum). CaAIL1 expression was upregulated by RSI, and loss- and gain-of-function assays using virus-induced gene silencing and transient overexpression, respectively, revealed that CaAIL1 plays a positive role in immunity to RSI in pepper. Chromatin immunoprecipitation sequencing (ChIP-seq) uncovered a subset of transcription-factor-encoding genes, including CaRAP2-7, CaGATA17, CaGtf3a and CaTCF25, that were directly targeted by CaAIL1 via their cis-elements, such as GT or AGGCA motifs. ChIP-qPCR and electrophoretic mobility shift assays confirmed these findings. These genes, encoding transcription factors with negative roles in immunity, were repressed by CaAIL1 during pepper response to RSI, whereas genes encoding positive immune regulators such as CaEAS were derepressed by CaAIL1. Importantly, we showed that the atypical EAR motif (LXXLXXLXX) in CaAIL1 is indispensable for its function in immunity. These findings indicate that CaAIL1 enhances the immunity of pepper against RSI by repressing a subset of negative immune regulators during the RSI response through its binding to several cis-elements in their promoters.
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Affiliation(s)
- Yutong Zheng
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Shicong He
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Weiwei Cai
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Lei Shen
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Xueying Huang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Sheng Yang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Yu Huang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Qiaoling Lu
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Hui Wang
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Deyi Guan
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
| | - Shuilin He
- Key Laboratory of Applied Genetics of Universities in Fujian Province, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- National Education Ministry Key Laboratory of Plant Genetic Improvement and Comprehensive Utilization, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
- College of Agriculture, Fujian Agriculture and Forestry University, No. 15, Shang xia dian Road, Jianxin Town, Cangshan District, Fuzhou, Fujian 350002, China
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