Light signal regulates endoreduplication and tomato fruit expansion through the SlPIF1a-SlTLFP8-SlCDKB2 module
文献类型： 外文期刊
作者： Zhang, Jiaojiao 1 ; Xu, Jiayi 1 ; Wang, Xinman 1 ; Liu, Ying 1 ; Li, Shuangtao 1 ; Zhang, Jialong 1 ; He, Lingfeng 1 ; Guo, Luqin 1 ; Li, Chonghua 1 ; Li, Xin - Xu 6 ; Guo, Yang - Dong 1 ; Zhang, Na 1 ;
作者机构： 1.China Agr Univ, Coll Hort, Beijing Key Lab Growth & Dev Regulat Protected Veg, Beijing 100193, Peoples R China
2.Hebei Normal Univ Sci & Technol, Coll Hort Sci & Technol, Hebei Key Lab Hort Germplasm Excavat & Innovat Uti, Qinhuangdao 066004, Peoples R China
3.Shanghai Acad Agr Sci, Facil Hort Inst, Shanghai Key Lab Facil Hort Technol, Shanghai 201403, Peoples R China
4.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing 100093, Peoples R China
5.Nanchong Acad Agr Sci, Inst Vegetables, Nanchong 637000, Sichuan, Peoples R China
6.Beijing Cuihu Agritech Co Ltd, Beijing 100095, Peoples R China
关键词： cyclin- dependent kinase; box tubby- like protein; fruit size; |phytochrome- interacting FACTOR; ubiquitination
期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：9.1； 五年影响因子：10.6 ）
ISSN： 0027-8424
年卷期： 2025 年 122 卷 4 期
页码：
收录情况： SCI
摘要： Light serves as an energy source for cell division and expansion during fruit development. Cell expansion significantly influences fruit size and is closely linked to endoreduplication, a unique cell cycle variation characterized by DNA replication without cytokinesis. Paradoxically, under conditions of ample photosynthates, light signaling suppresses cell expansion. The intricate regulation of endoreduplication in response to light signaling during fruit development has remained an intriguing question. Here, our study revealed that Tubby- like F- box protein 8 (SlTLFP8) orchestrated endoreduplication to facilitate fruit cell expansion. As an Skp1- Cullin-F-box (SCF)-type E3 ligase, SlTLFP8 promoted the ubiquitination and subsequent degradation of CYCLIN- DEPENDENT KINASE B2 (SlCDKB2), thereby elevating DNA ploidy. The light signaling component PHYTOCHROME- INTERACTING FACTOR 1a (SlPIF1a), identified as a pivotal negative regulator in the plant's light response, was found to directly interact with the promoter of the SlTLFP8 gene, thereby stimulating its transcriptional activation. Indeed, SlPIF1a contributed to a faster expansion rate of tomato fruit during nighttime. Altogether, our results elucidate the connection between light signals and fruit size regulation through endoreduplication.
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