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Genetic control of thermomorphogenesis in tomato inflorescences

文献类型： 外文期刊

作者： Sun S.;Liu Z.;Wang X.;Song J.;Fang S.;Kong J.;Li R.;Wang H.;Cui X.

作者机构：

期刊名称： Nature communications

ISSN： 2041-1723

年卷期： 2024 年 15 卷 1 期

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收录情况： SCIE（2024版）

摘要： Understanding how plants alter their development and architecture in response to ambient temperature is crucial for breeding resilient crops. Here, we identify the quantitative trait locus qMULTIPLE INFLORESCENCE BRANCH 2 (qMIB2), which modulates inflorescence branching in response to high ambient temperature in tomato (Solanum lycopersicum). The non-functional mib2 allele may have been selected in large-fruited varieties to ensure larger and more uniform fruits under varying temperatures. MIB2 gene encodes a homolog of the Arabidopsis thaliana transcription factor SPATULA; its expression is induced in meristems at high temperature. MIB2 directly binds to the promoter of its downstream gene CONSTANS-Like1 (SlCOL1) by recognizing the conserved G-box motif to activate SlCOL1 expression in reproductive meristems. Overexpressing SlCOL1 rescue the reduced inflorescence branching of mib2, suggesting how the MIB2-SlCOL1 module helps tomato inflorescences adapt to high temperature. Our findings reveal the molecular mechanism underlying inflorescence thermomorphogenesis and provide a target for breeding climate-resilient crops. © 2024. The Author(s).

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