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Ji L, Zhang Z, Liu S, Zhao L, Li Q, Xiao B, Suzuki N, Burks DJ, Azad RK, Xie G. The OsTIL1 lipocalin protects cell membranes from reactive oxygen species damage and maintains the 18:3-containing glycerolipid biosynthesis under cold stress in rice. Plant J 2024; 117:72-91. [PMID: 37753661 DOI: 10.1111/tpj.16470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 08/24/2023] [Accepted: 09/01/2023] [Indexed: 09/28/2023]
Abstract
Lipocalins constitute a conserved protein family that binds to and transports a variety of lipids while fatty acid desaturases (FADs) are required for maintaining the cell membrane fluidity under cold stress. Nevertheless, it remains unclear whether plant lipocalins promote FADs for the cell membrane integrity under cold stress. Here, we identified the role of OsTIL1 lipocalin in FADs-mediated glycerolipid remodeling under cold stress. Overexpression and CRISPR/Cas9 mediated gene edition experiments demonstrated that OsTIL1 positively regulated cold stress tolerance by protecting the cell membrane integrity from reactive oxygen species damage and enhancing the activities of peroxidase and ascorbate peroxidase, which was confirmed by combined cold stress with a membrane rigidifier dimethyl sulfoxide or a H2 O2 scavenger dimethyl thiourea. OsTIL1 overexpression induced higher 18:3 content, and higher 18:3/18:2 and (18:2 + 18:3)/18:1 ratios than the wild type under cold stress whereas the gene edition mutant showed the opposite. Furthermore, the lipidomic analysis showed that OsTIL1 overexpression led to higher contents of 18:3-mediated glycerolipids, including galactolipids (monoglactosyldiacylglycerol and digalactosyldiacylglycerol) and phospholipids (phosphatidyl glycerol, phosphatidyl choline, phosphatidyl ethanolamine, phosphatidyl serine and phosphatidyl inositol) under cold stress. RNA-seq and enzyme linked immunosorbent assay analyses indicated that OsTIL1 overexpression enhanced the transcription and enzyme abundance of four ω-3 FADs (OsFAD3-1/3-2, 7, and 8) under cold stress. These results reveal an important role of OsTIL1 in maintaining the cell membrane integrity from oxidative damage under cold stress, providing a good candidate gene for improving cold tolerance in rice.
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Affiliation(s)
- Lingxiao Ji
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhengfeng Zhang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, 430079, China
| | - Shuang Liu
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Liyan Zhao
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qiang Li
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Benze Xiao
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Nobuhiro Suzuki
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Tokyo, Japan
| | - David J Burks
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, Texas, 76203, USA
- Department of Mathematics, University of North Texas, Denton, Texas, 76203, USA
| | - Rajeev K Azad
- Department of Biological Sciences and BioDiscovery Institute, University of North Texas, Denton, Texas, 76203, USA
- Department of Mathematics, University of North Texas, Denton, Texas, 76203, USA
| | - Guosheng Xie
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
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