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  Evolutionary Gain of Oligosaccharide Hydrolysis and Sugar Transport Enhanced Carbohydrate Partitioning in Sweet Watermelon Fruits

Ren, Y., Li, M., Guo, S., Sun, H., Zhao, J., Zhang, J., et al. (2021). Evolutionary Gain of Oligosaccharide Hydrolysis and Sugar Transport Enhanced Carbohydrate Partitioning in Sweet Watermelon Fruits. The Plant Cell. Retrieved from https://doi.org/10.1093/plcell/koab055.

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 Creators:
Ren, Yi1, Author
Li, Maoying1, Author
Guo, Shaogui1, Author
Sun, Honghe1, Author
Zhao, Jianyu1, Author
Zhang, Jie1, Author
Liu, Guangmin1, Author
He, Hongju1, Author
Tian, Shouwei1, Author
Yu, Yongtao1, Author
Gong, Guoyi1, Author
Zhang, Haiying1, Author
Zhang, Xiaolan1, Author
Alseekh, S.2, Author              
Fernie, A. R.3, Author              
Scheller, Henrik V1, Author
Xu, Yong1, Author
Affiliations:
1external, ou_persistent22              
2The Genetics of Crop Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_3244836              
3Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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 Abstract: How raffinose (Raf) family oligosaccharides (RFOs), the major translocated sugars in the vascular bundle in cucurbits, are hydrolyzed and subsequently partitioned has not been fully elucidated. By performing reciprocal grafting of watermelon (Citrullus lanatus) fruits to branch stems, we observed that Raf was hydrolyzed in the fruit of cultivar watermelons but was backlogged in the fruit of wild ancestor species. Through a genome-wide association study (GWAS), the alkaline alpha-galactosidase ClAGA2 was identified as the key factor controlling stachyose (Sta) and Raf hydrolysis, and it was determined to be specifically expressed in the vascular bundle. Analysis of transgenic plants confirmed that ClAGA2 controls fruit Raf hydrolysis and reduces sugar content in fruits. Two SNPs within the ClAGA2 promoter affect the recruitment of the transcription factor ClNF-YC2 (nuclear transcription factor Y subunit C) to regulate ClAGA2 expression. Moreover, this study demonstrates that C. lanatus Sugars Will Eventually Be Exported Transporter 3 (ClSWEET3) and Tonoplast Sugar Transporter (ClTST2) participate in plasma membrane sugar transport and sugar storage in fruit cell vacuoles, respectively. Knocking out ClAGA2, ClSWEET3 and ClTST2 affected fruit sugar accumulation. Genomic signatures indicate that the selection of ClAGA2, ClSWEET3 and ClTST2 for carbohydrate partitioning led to the derivation of modern sweet watermelon from non-sweet ancestors during domestication.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
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Title: The Plant Cell
  Abbreviation : Plant C
Source Genre: Journal
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Publ. Info: Rockville : American Society of Plant Physiologists
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 1532-298X
CoNE: https://pure.mpg.de/cone/journals/resource/1532-298X