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Wu X, Li J, Song LY, Zeng LL, Guo ZJ, Ma DN, Wei MY, Zhang LD, Wang XX, Zheng HL. NADPH oxidase-dependent H 2O 2 production mediates salicylic acid-induced salt tolerance in mangrove plant Kandelia obovata by regulating Na +/K + and redox homeostasis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 118:1119-1135. [PMID: 38308390 DOI: 10.1111/tpj.16660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 01/12/2024] [Accepted: 01/22/2024] [Indexed: 02/04/2024]
Abstract
Salicylic acid (SA) is known to enhance salt tolerance in plants. However, the mechanism of SA-mediated response to high salinity in halophyte remains unclear. Using electrophysiological and molecular biological methods, we investigated the role of SA in response to high salinity in mangrove species, Kandelia obovata, a typical halophyte. Exposure of K. obovata roots to high salinity resulted in a rapid increase in endogenous SA produced by phenylalanine ammonia lyase pathway. The application of exogenous SA improved the salt tolerance of K. obovata, which depended on the NADPH oxidase-mediated H2O2. Exogenous SA and H2O2 increased Na+ efflux and reduced K+ loss by regulating the transcription levels of Na+ and K+ transport-related genes, thus reducing the Na+/K+ ratio in the salt-treated K. obovata roots. In addition, exogenous SA-enhanced antioxidant enzyme activity and its transcripts, and the expressions of four genes related to AsA-GSH cycle as well, then alleviated oxidative damages in the salt-treated K. obovata roots. However, the above effects of SA could be reversed by diphenyleneiodonium chloride (the NADPH oxidase inhibitor) and paclobutrazol (a SA biosynthesis inhibitor). Collectively, our results demonstrated that SA-induced salt tolerance of K. obovata depends on NADPH oxidase-generated H2O2 that affects Na+/K+ and redox homeostasis in response to high salinity.
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Affiliation(s)
- Xuan Wu
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Jing Li
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Ling-Yu Song
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Lin-Lan Zeng
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Ze-Jun Guo
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Dong-Na Ma
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Ming-Yue Wei
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Lu-Dan Zhang
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
| | - Xiu-Xiu Wang
- College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361005, P.R. China
| | - Hai-Lei Zheng
- Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, P.R. China
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Qiao Z, Li J, Zhang X, Guo H, He C, Zong D. Genome-Wide Identification, Expression Analysis, and Subcellular Localization of DET2 Gene Family in Populus yunnanensis. Genes (Basel) 2024; 15:148. [PMID: 38397138 PMCID: PMC10888042 DOI: 10.3390/genes15020148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/18/2024] [Accepted: 01/22/2024] [Indexed: 02/25/2024] Open
Abstract
(1) Background: Brassinosteroids (BRs) are important hormones involved in almost all stages of plant growth and development, and sterol dehydrogenase is a key enzyme involved in BRs biosynthesis. However, the sterol dehydrogenase gene family of Populus yunnanensis Dode (P. yunnanensis) has not been studied. (2) Methods: The PyDET2 (DEETIOLATED2) gene family was identified and analyzed. Three genes were screened based on RNA-seq of the stem tips, and the PyDET2e was further investigated via qRT-PCR (quantitative real-time polymerase chain reaction) and subcellular localization. (3) Results: The 14 DET2 family genes in P. yunnanensis were categorized into four groups, and 10 conserved protein motifs were identified. The gene structure, chromosome distribution, collinearity, and codon preference of all PyDET2 genes in the P. yunnanensis genome were analyzed. The codon preference of this family is towards the A/U ending, which is strongly influenced by natural selection. The PyDET2e gene was expressed at a higher level in September than in July, and it was significantly expressed in stems, stem tips, and leaves. The PyDET2e protein was localized in chloroplasts. (4) Conclusions: The PyDET2e plays an important role in the rapid growth period of P. yunnanensis. This systematic analysis provides a basis for the genome-wide identification of genes related to the brassinolide biosynthesis process in P. yunnanensis, and lays a foundation for the study of the rapid growth mechanism of P. yunnanensis.
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Affiliation(s)
- Zhensheng Qiao
- College of Life Sciences, Southwest Forestry University, Kunming 650224, China; (Z.Q.); (J.L.); (H.G.); (C.H.)
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
| | - Jiaqi Li
- College of Life Sciences, Southwest Forestry University, Kunming 650224, China; (Z.Q.); (J.L.); (H.G.); (C.H.)
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
| | - Xiaolin Zhang
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
- College of Forestry, Southwest Forestry University, Kunming 650224, China
| | - Haiyang Guo
- College of Life Sciences, Southwest Forestry University, Kunming 650224, China; (Z.Q.); (J.L.); (H.G.); (C.H.)
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
| | - Chengzhong He
- College of Life Sciences, Southwest Forestry University, Kunming 650224, China; (Z.Q.); (J.L.); (H.G.); (C.H.)
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
- Key Laboratory of Biodiversity Conservation in Southwest China, State Forestry Administration, Southwest Forestry University, Kunming 650224, China
| | - Dan Zong
- College of Life Sciences, Southwest Forestry University, Kunming 650224, China; (Z.Q.); (J.L.); (H.G.); (C.H.)
- Key Laboratory for Forest Genetic and Tree Improvement and Propagation in University of YunnanProvince, Southwest Forestry University, Kunming 650224, China;
- Key Laboratory of Biodiversity Conservation in Southwest China, State Forestry Administration, Southwest Forestry University, Kunming 650224, China
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