Control of arbuscule development by a transcriptional negative feedback loop in Medicago

Qiang Zhang, Shuangshuang Wang, Qiujin Xie, Yuanjun Xia, Lei Lu, Mingxing Wang, Gang Wang, Siyu Long, Yunfei Cai, Ling Xu, Ertao Wang () and Yina Jiang ()
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Qiang Zhang: East China Normal University
Shuangshuang Wang: East China Normal University
Qiujin Xie: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
Yuanjun Xia: East China Normal University
Lei Lu: East China Normal University
Mingxing Wang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
Gang Wang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
Siyu Long: East China Normal University
Yunfei Cai: East China Normal University
Ling Xu: East China Normal University
Ertao Wang: National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
Yina Jiang: East China Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract Most terrestrial plants establish a symbiosis with arbuscular mycorrhizal fungi (AMF), which provide them with lipids and sugars in exchange for phosphorus and nitrogen. Nutrient exchange must be dynamically controlled to maintain a mutually beneficial relationship between the two symbiotic partners. The WRI5a and its homologues play a conserved role in lipid supply to AMF. Here, we demonstrate that the AP2/ERF transcription factor MtERM1 binds directly to AW-box and AW-box-like cis-elements in the promoters of MtSTR2 and MtSTR, which are required for host lipid efflux and arbuscule development. The EAR domain-containing transcription factor MtERF12 is also directly activated by MtERM1/MtWRI5a to negatively regulate arbuscule development, and the TOPLESS co-repressor is further recruited by MtERF12 through EAR motif to oppose MtERM1/MtWRI5a function, thereby suppressing arbuscule development. We therefore reveal an ERM1/WRI5a–ERF12–TOPLESS negative feedback loop that enables plants to flexibly control nutrient exchange and ensure a mutually beneficial symbiosis.

Date: 2023
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DOI: 10.1038/s41467-023-41493-2

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