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Jiang C, Li B, Song Z, Zhang Y, Yu C, Wang H, Wang L, Zhang H. PtBRI1.2 promotes shoot growth and wood formation through a brassinosteroid-mediated PtBZR1-PtWNDs module in poplar. J Exp Bot 2021; 72:6350-6364. [PMID: 34089602 DOI: 10.1093/jxb/erab260] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 06/04/2021] [Indexed: 06/12/2023]
Abstract
Brassinosteroid-insensitive-1 (BRI1) plays important roles in various signalling pathways controlling plant growth and development. However, the regulatory mechanism of BRI1 in brassinosteroid (BR)-mediated signalling for shoot growth and wood formation in woody plants is largely unknown. In this study, PtBRI1.2, a brassinosteroid-insensitive-1 gene, was overexpressed in poplar. Shoot growth and wood formation of transgenic plants were examined and the regulatory genes involved were verified. PtBRI1.2 was localized to the plasma membrane, with a predominant expression in leaves. Ectopic expression of PtBRI1.2 in Arabidopsis bri1-201 and bri1-5 mutants rescued their retarded-growth phenotype. Overexpression of PtBRI1.2 in poplar promoted shoot growth and wood formation in transgenic plants. Further studies revealed that overexpression of PtBRI1.2 promoted the accumulation of PtBZR1 (BRASSINAZOLE RESISTANT1) in the nucleus, which subsequently activated PtWNDs (WOOD-ASSOCIATED NAC DOMAIN transcription factors) to up-regulate expression of secondary cell wall biosynthesis genes involved in wood formation. Our results suggest that PtBRI1.2 plays a crucial role in regulating shoot growth and wood formation by activating BR signalling.
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Affiliation(s)
- Chunmei Jiang
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, China
- National Key Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Bei Li
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and abiotic Resistant Plants in the Universities of Shandong, and Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Zhizhong Song
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and abiotic Resistant Plants in the Universities of Shandong, and Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Yuliang Zhang
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
| | - Chunyan Yu
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and abiotic Resistant Plants in the Universities of Shandong, and Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
| | - Haihai Wang
- National Key Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Limin Wang
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and abiotic Resistant Plants in the Universities of Shandong, and Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
| | - Hongxia Zhang
- The Engineering Research Institute of Agriculture and Forestry, Ludong University, Yantai, China
- The Key Laboratory of Molecular Module-Based Breeding of High Yield and abiotic Resistant Plants in the Universities of Shandong, and Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, China
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, China
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