Watermelon domestication was shaped by stepwise selection and regulation of the metabolome
文献类型： 外文期刊
作者： Yuan, Pingli 1 ; Xu, Congping 2 ; He, Nan 1 ; Lu, Xuqiang 1 ; Zhang, Xingping 3 ; Shang, Jianli 1 ; Zhu, Hongju 1 ; Gong, Chengsheng 1 ; Kuang, Hanhui 4 ; Tang, Tang 5 ; Xu, Yong 6 ; Ma, Shuangwu 1 ; Sun, Dexi 1 ; Zhang, Weiqin 5 ; Umer, Muhammad J. 1 ; Shi, Jian 5 ; Fernie, Alisdair R. 7 ; Liu, Wenge 1 ; Luo, Jie 2 ;
作者机构： 1.Chinese Acad Agr Sci, Zhengzhou Fruit Res Inst, Henan Joint Int Res Lab South Asian Fruits & Cucu, Zhengzhou 450009, Peoples R China
2.Hainan Univ, Hainan Yazhou Bay Seed Lab, Sanya Nanfan Res Inst, Sanya 572025, Peoples R China
3.Peking Univ, Inst Adv Agr Sci, Weifang 261325, Peoples R China
4.Huazhong Agr Univ, Coll Hort & Forestry Sci, Wuhan 430070, Peoples R China
5.Wuhan Metware Biotechnol Co Ltd, Wuhan 430070, Peoples R China
6.Beijing Acad Agr & Forestry Sci, Natl Watermelon & Melon Improvement Ctr, Beijing 100097, Peoples R China
7.Max Planck Inst Mol Plant Physiol, D-144776 Potsdam, Germany
8.Hainan Univ, Coll Trop Crops, Haikou 572208, Hainan, Peoples R China
关键词： metabolome; mGWAS; gene cluster; domestication; cucurbitacin biosynthesis
期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：10.372； 五年影响因子：7.587 ）
ISSN： 1674-7305
年卷期：
页码：
收录情况： SCI
摘要： Although crop domestication has greatly aided human civilization, the sequential domestication and regulation of most quality traits remain poorly understood. Here, we report the stepwise selection and regulation of major fruit quality traits that occurred during watermelon evolution. The levels of fruit cucurbitacins and flavonoids were negatively selected during speciation, whereas sugar and carotenoid contents were positively selected during domestication. Interestingly, fruit malic acid and citric acid showed the opposite selection trends during the improvement. We identified a novel gene cluster (CGC1, cucurbitacin gene cluster on chromosome 1) containing both regulatory and structural genes involved in cucurbitacin biosynthesis, which revealed a cascade of transcriptional regulation operating mechanisms. In the CGC1, an allele caused a single nucleotide change in ClERF1 binding sites (GCC-box) in the promoter of ClBh1, which resulted in reduced expression of ClBh1 and inhibition of cucurbitacin synthesis in cultivated watermelon. Functional analysis revealed that a rare insertion of 244 amino acids, which arose in C. amarus and became fixed in sweet watermelon, in ClOSC (oxidosqualene cyclase) was critical for the negative selection of cucurbitacins during watermelon evolution. This research provides an important resource for metabolomics-assisted breeding in watermelon and for exploring metabolic pathway regulation mechanisms.
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