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A feedback loop at the THERMOSENSITIVE PARTHENOCARPY 4 locus controls tomato fruit set under heat stress

文献类型： 外文期刊

作者： Lu, Xiaonan 1 ; Wu, Jianxin 1 ; Shi, QianQian 1 ; Sun, Shuai 1 ; Cheng, Yuan 2 ; Zhou, Guozhi 2 ; Li, Ren 1 ; Wang, Huanzhong 3 ; van der Knaap, Esther 4 ; Cui, Xia 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, State Key Lab Vegetable Biobreeding, Sino Dutch Joint Lab Hort Genom, Beijing 100081, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Vegetables, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China

3.Univ Connecticut, Dept Plant Sci & Landscape Architecture, Storrs, CT 06269 USA

4.Univ Georgia, Dept Hort, Athens, GA 30602 USA

5.Univ Georgia, Inst Plant Breeding Genet & Genom, Athens, GA 30602 USA

6.Zhejiang A&F Univ, Coll Hort Sci, Minist Agr & Rural Affairs, Key Lab Qual & Safety Control Subtrop Fruit & Vege, Hangzhou 311300, Peoples R China

期刊名称：NATURE COMMUNICATIONS （ 影响因子：15.7； 五年影响因子：17.2 ）

ISSN：

年卷期： 2025 年 16 卷 1 期

页码：

收录情况： SCI

摘要： High temperatures compromise crop productivity worldwide, but breeding bottlenecks slow the delivery of climate-resilient crops. By investigating tomato fruit set under high temperatures, we discover a module comprising two linked genes, THERMOSENSITIVE PARTHENOCARPY 4a (TSP4a) and TSP4b, which encode the transcriptional regulators IAA9 and AINTEGUMENTA (ANT), respectively, to control thermosensitive parthenocarpy. TSP4a and TSP4b form a positive feedback loop upon heat stress to repress auxin signaling in ovaries. Natural TSP4a and TSP4b alleles bear regulatory-region polymorphisms and are differentially expressed to overcome the trade-off between fruit set and wider plant development. Gene editing of the TSP4a promoter and TSP4b 3' UTR in open-chromatin regions results in expression down-regulation, increased parthenocarpy without yield penalties and maintenance of fruit-sugar levels without broad auxin-related pleiotropic defects in greenhouse-grown plants. These mechanistic insights into heat-induced parthenocarpy and auxin signaling in reproductive organs demonstrate breeding utility to safeguard tomato yield under warming scenarios.

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