Switching action modes of miR408-5p mediates auxin signaling in rice

Fuxi Rong, Yusong Lv, Pingchuan Deng, Xia Wu, Yaqi Zhang, Erkui Yue, Yuxin Shen, Sajid Muhammad, Fangrui Ni, Hongwu Bian, Xiangjin Wei, Weijun Zhou, Peisong Hu and Liang Wu ()
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Fuxi Rong: Zhejiang University
Yusong Lv: Zhejiang University
Pingchuan Deng: Zhejiang University
Xia Wu: Zhejiang University
Yaqi Zhang: Zhejiang University
Erkui Yue: Zhejiang University
Yuxin Shen: Zhejiang University
Sajid Muhammad: Zhejiang University
Fangrui Ni: Zhejiang University
Hongwu Bian: Zhejiang University
Xiangjin Wei: China National Rice Research Institute
Weijun Zhou: Zhejiang University
Peisong Hu: China National Rice Research Institute
Liang Wu: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-17

Abstract: Abstract MicroRNAs (miRNAs) play fundamental roles in many developmental and physiological processes in eukaryotes. MiRNAs in plants generally regulate their targets via either mRNA cleavage or translation repression; however, which approach plays a major role and whether these two function modes can shift remains elusive. Here, we identify a miRNA, miR408-5p that regulates AUXIN/INDOLE ACETIC ACID 30 (IAA30), a critical repressor in the auxin pathway via switching action modes in rice. We find that miR408-5p usually inhibits IAA30 protein translation, but in a high auxin environment, it promotes the decay of IAA30 mRNA when it is overproduced. We further demonstrate that IDEAL PLANT ARCHITECTURE1 (IPA1), an SPL transcription factor regulated by miR156, mediates leaf inclination through association with miR408-5p precursor promoter. We finally show that the miR156-IPA1-miR408-5p-IAA30 module could be controlled by miR393, which silences auxin receptors. Together, our results define an alternative auxin transduction signaling pathway in rice that involves the switching of function modes by miR408-5p, which contributes to a better understanding of the action machinery as well as the cooperative network of miRNAs in plants.

Date: 2024
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DOI: 10.1038/s41467-024-46765-z

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