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A CsTu-TS1 regulatory module promotes fruit tubercule formation in cucumber

文献类型： 外文期刊

作者： Yang, Sen 1 ; Wen, Changlong 2 ; Liu, Bin 1 ; Cai, Yanling 1 ; Xue, Shudan 1 ; Bartholomew, Ezra S. 1 ; Dong, Mingming 1 ;

作者机构： 1.China Agr Univ, Beijing Key Lab Growth & Dev Regulat Protected Ve, Coll Hort, Beijing, Peoples R China

2.Beijing Acad Agr & Forestry Sci, BVRC, Natl Engn Res Ctr Vegetables, Beijing, Peoples R China

3.Tianjin Derit Seeds Co Ltd, Tianjin, Peoples R China

关键词： cucumber; fruit tubercule size; auxin; CsTu-TS1 regulatory module

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2019 年 17 卷 1 期

页码：

收录情况： SCI

摘要： The fruit epidermal features such as the size of tubercules are important fruit quality traits for cucumber production. But the mechanisms underlying tubercule formation remain elusive. Here, tubercule size locus CsTS1 was identified by map-based cloning and was found to encode an oleosin protein. Allelic variation was identified in the promoter region of CsTS1, resulting in low expression of CsTS1 in all 22 different small-warty or nonwarty cucumber lines. High CsTS1 expression levels were closely correlated with increased fruit tubercule size among 44 different cucumber lines. Transgenic complementation and RNAi-mediated gene silencing of CsTS1 in transgenic cucumber plants demonstrated that CsTS1 positively regulates the development of tubercules. CsTS1 is highly expressed in the peel at fruit tubercule forming and enlargement stage. Auxin content and expression of three auxin signalling pathway genes were altered in the 35S:CsTS1 and CsTS1-RNAi fruit tubercules, a result that was supported by comparing the cell size of the control and transgenic fruit tubercules. CsTu, a C2H2 zinc finger domain transcription factor that regulates tubercule initiation, binds directly to the CsTS1 promoter and promotes its expression. Taken together, our results reveal a novel mechanism in which the CsTu-TS1 complex promotes fruit tubercule formation in cucumber.

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