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Wang M, Jiang N, Xu Y, Chen X, Wang C, Wang C, Wang S, Xu K, Chai S, Yu Q, Zhang Z, Zhang H. CmBr confers fruit bitterness under CPPU treatment in melon. PLANT BIOTECHNOLOGY JOURNAL 2024. [PMID: 38816932 DOI: 10.1111/pbi.14399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 04/06/2024] [Accepted: 05/13/2024] [Indexed: 06/01/2024]
Abstract
Many biotic or abiotic factors such as CPPU (N-(2-chloro-pyridin-4-yl)-N'-phenylurea), a growth regulator of numerous crops, can induce bitterness in cucurbits. In melon, cucurbitacin B is the major compound leading to bitterness. However, the molecular mechanism underlying CuB biosynthesis in response to different conditions remains unclear. Here, we identified a set of genes involved in CPPU-induced CuB biosynthesis in melon fruit and proposed CmBr gene as the major regulator. Using CRISPR/Cas9 gene editing, we confirmed CmBr's role in regulating CuB biosynthesis under CPPU treatment. We further discovered a CPPU-induced MYB-related transcription factor, CmRSM1, which specifically binds to the Myb motif within the CmBr promoter and activates its expression. Moreover, we developed an introgression line by introducing the mutated Cmbr gene into an elite variety and eliminated CPPU-induced bitterness, demonstrating its potential application in breeding. This study offers a valuable tool for breeding high-quality non-bitter melon varieties and provides new insights into the regulation of secondary metabolites under environmental stresses.
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Affiliation(s)
- Mingyan Wang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Naiyu Jiang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yuanchao Xu
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Shenzhen Key Laboratory of Agricultural Synthetic Biology, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China
| | - Xinxiu Chen
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Cui Wang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Chuangjiang Wang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Shiqi Wang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Kuipeng Xu
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Sen Chai
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Qing Yu
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Zhonghua Zhang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
| | - Huimin Zhang
- Engineering Laboratory of Genetic Improvement of Horticultural Crops of Shandong Province, Laboratory of Quality & Safety Risk Assessment for Fruit (Qingdao), Ministry of Agriculture and Rural Affairs, National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products (Qingdao), College of Horticulture, Qingdao Agricultural University, Qingdao, 266109, China
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Lao TD, Nguyen NH, Le TAH, Nguyen PDT. Insights into Sucrose Metabolism and Its Ethylene-Dependent Regulation in Cucumis melo L. Mol Biotechnol 2023:10.1007/s12033-023-00987-6. [PMID: 38102344 DOI: 10.1007/s12033-023-00987-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 11/05/2023] [Indexed: 12/17/2023]
Abstract
The melon (Cucumis melo L.), a fruit crop of significant economic importance, is prized for its sweet and succulent fruits. Among variations of soluble sugars, sucrose, a disaccharide composed of glucose and fructose, is a key carbohydrate present in melon fruits. The sucrose content also determines the quality and value of melon fruits. However, the accumulation of sucrose is a complex process involving the coordinated actions of multiple enzymes and pathways. In melon species, there are two types of fruit ripening modes including climacteric and non-climacteric. Due to this biological characteristic, melon is emerging as a good model for studying the ripening process. Ethylene is a well-known phytohormone regulating the ripening of climacteric fruits. Recently, a few studies have elucidated a primary ethylene-dependent signaling pathway of sucrose accumulation in melon fruits. This review aims to provide a careful overview of the sucrose biosynthesis pathways in melon. It is essential to understand the molecular mechanisms of sucrose metabolism as well as its regulation mode. The information will be useful for developing molecular marker-assisted breeding as well as genetic engineering strategies aiming to improve the sucrose content and quality of melon fruits. In addition, even though limited, the impacts of genetic background and environmental factors on sucrose accumulation in melon fruits are also discussed. These are useful for practical applications in melon cultivation and quality management.
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Affiliation(s)
- Thuan Duc Lao
- Faculty of Biotechnology, Ho Chi Minh City Open University, Ho Chi Minh City, Vietnam
| | - Nguyen Hoai Nguyen
- Faculty of Biotechnology, Ho Chi Minh City Open University, Ho Chi Minh City, Vietnam
| | - Thuy Ai Huyen Le
- Faculty of Biotechnology, Ho Chi Minh City Open University, Ho Chi Minh City, Vietnam
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