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Kang L, Zhang C, Liu J, Ye M, Zhang L, Chen F, Lin X, Yang D, Ren L, Li Y, Kim HS, Kwak SS, Li H, Deng X, Zhang P, Ke Q. Overexpression of potato ORANGE (StOR) and StOR mutant in Arabidopsis confers increased carotenoid accumulation and tolerance to abiotic stress. Plant Physiol Biochem 2023; 201:107809. [PMID: 37315350 DOI: 10.1016/j.plaphy.2023.107809] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 05/10/2023] [Accepted: 05/31/2023] [Indexed: 06/16/2023]
Abstract
ORANGE (OR) plays essential roles in regulating carotenoid homeostasis and enhancing the ability of plants to adapt to environmental stress. However, OR proteins have been functionally characterized in only a few plant species, and little is known about the role of potato OR (StOR). In this study, we characterized the StOR gene in potato (Solanum tuberosum L. cv. Atlantic). StOR is predominantly localized to the chloroplast, and its transcripts are tissue-specifically expressed and significantly induced in response to abiotic stress. Compared with wild type, overexpression of StOR increased β-carotene levels up to 4.8-fold, whereas overexpression of StORHis with a conserved arginine to histidine substitution promoted β-carotene accumulation up to 17.6-fold in Arabidopsis thaliana calli. Neither StOR nor StORHis overexpression dramatically affected the transcript levels of carotenoid biosynthetic genes. Furthermore, overexpression of either StOR or StORHis increased abiotic stress tolerance in Arabidopsis, which was associated with higher photosynthetic capacity and antioxidative activity. Taken together, these results indicate that StOR could be exploited as a potential new genetic tool for the improvement of crop nutritional quality and environmental stress tolerance.
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Affiliation(s)
- Le Kang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637002, China; National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China
| | - Chunli Zhang
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Junke Liu
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Muying Ye
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Li Zhang
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637002, China
| | - Fengfeng Chen
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637002, China
| | - Xinyue Lin
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Dongjing Yang
- Key Laboratory of Biology and Genetic Improvement of Sweetpotato, Ministry of Agriculture and Rural Affairs, Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai District, Xuzhou, Jiangsu, 221131, China
| | - Liping Ren
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637002, China
| | - Yunxiang Li
- College of Environmental Science and Engineering, China West Normal University, Nanchong, 637002, China
| | - Ho Soo Kim
- Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, South Korea
| | - Sang-Soo Kwak
- Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, South Korea
| | - Hongbing Li
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Xiping Deng
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai, 200032, China.
| | - Qingbo Ke
- Institute of Soil and Water Conservation, Northwest A&F University, Yangling, 712100, China.
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