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The negative regulator SMAX1 controls mycorrhizal symbiosis and strigolactone biosynthesis in rice

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  • Jeongmin Choi

    (Department of Plant Sciences, University of Cambridge)

  • Tak Lee

    (Sainsbury Laboratory, University of Cambridge)

  • Jungnam Cho

    (Sainsbury Laboratory, University of Cambridge
    CAS-JIC Centre of Excellence for Plant and Microbial Science)

  • Emily K. Servante

    (Department of Plant Sciences, University of Cambridge)

  • Boas Pucker

    (Department of Plant Sciences, University of Cambridge
    Center for Biotechnology, Bielefeld University)

  • William Summers

    (Department of Plant Sciences, University of Cambridge)

  • Sarah Bowden

    (The John Bingham Laboratory, NIAB)

  • Mehran Rahimi

    (Swammerdam Institute for Life Sciences, University of Amsterdam)

  • Kyungsook An

    (Crop Biotech Institute, Kyung Hee University)

  • Gynheung An

    (Crop Biotech Institute, Kyung Hee University)

  • Harro J. Bouwmeester

    (Swammerdam Institute for Life Sciences, University of Amsterdam)

  • Emma J. Wallington

    (The John Bingham Laboratory, NIAB)

  • Giles Oldroyd

    (Department of Plant Sciences, University of Cambridge
    Sainsbury Laboratory, University of Cambridge)

  • Uta. Paszkowski

    (Department of Plant Sciences, University of Cambridge)

Abstract

Most plants associate with beneficial arbuscular mycorrhizal (AM) fungi that facilitate soil nutrient acquisition. Prior to contact, partner recognition triggers reciprocal genetic remodelling to enable colonisation. The plant Dwarf14-Like (D14L) receptor conditions pre-symbiotic perception of AM fungi, and also detects the smoke constituent karrikin. D14L-dependent signalling mechanisms, underpinning AM symbiosis are unknown. Here, we present the identification of a negative regulator from rice, which operates downstream of the D14L receptor, corresponding to the homologue of the Arabidopsis thaliana Suppressor of MAX2-1 (AtSMAX1) that functions in karrikin signalling. We demonstrate that rice SMAX1 is a suppressor of AM symbiosis, negatively regulating fungal colonisation and transcription of crucial signalling components and conserved symbiosis genes. Similarly, rice SMAX1 negatively controls strigolactone biosynthesis, demonstrating an unexpected crosstalk between the strigolactone and karrikin signalling pathways. We conclude that removal of SMAX1, resulting from D14L signalling activation, de-represses essential symbiotic programmes and increases strigolactone hormone production.

Suggested Citation

  • Jeongmin Choi & Tak Lee & Jungnam Cho & Emily K. Servante & Boas Pucker & William Summers & Sarah Bowden & Mehran Rahimi & Kyungsook An & Gynheung An & Harro J. Bouwmeester & Emma J. Wallington & Gile, 2020. "The negative regulator SMAX1 controls mycorrhizal symbiosis and strigolactone biosynthesis in rice," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16021-1
    DOI: 10.1038/s41467-020-16021-1
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    Cited by:

    1. Debatosh Das & Kartikye Varshney & Satoshi Ogawa & Salar Torabi & Regine Hüttl & David C. Nelson & Caroline Gutjahr, 2025. "Ethylene promotes SMAX1 accumulation to inhibit arbuscular mycorrhiza symbiosis," Nature Communications, Nature, vol. 16(1), pages 1-17, December.
    2. Xin-Ran Li & Jongho Sun & Doris Albinsky & Darius Zarrabian & Raphaella Hull & Tak Lee & Edwin Jarratt-Barnham & Chai Hao Chiu & Amy Jacobsen & Eleni Soumpourou & Alessio Albanese & Wouter Kohlen & Le, 2022. "Nutrient regulation of lipochitooligosaccharide recognition in plants via NSP1 and NSP2," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    3. Aino Komatsu & Mizuki Fujibayashi & Kazato Kumagai & Hidemasa Suzuki & Yuki Hata & Yumiko Takebayashi & Mikiko Kojima & Hitoshi Sakakibara & Junko Kyozuka, 2025. "KAI2-dependent signaling controls vegetative reproduction in Marchantia polymorpha through activation of LOG-mediated cytokinin synthesis (14)," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
    4. Kyoichi Kodama & Mélanie K. Rich & Akiyoshi Yoda & Shota Shimazaki & Xiaonan Xie & Kohki Akiyama & Yohei Mizuno & Aino Komatsu & Yi Luo & Hidemasa Suzuki & Hiromu Kameoka & Cyril Libourel & Jean Kelle, 2022. "An ancestral function of strigolactones as symbiotic rhizosphere signals," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    5. Satoshi Ogawa & Songkui Cui & Alexandra R. F. White & David C. Nelson & Satoko Yoshida & Ken Shirasu, 2022. "Strigolactones are chemoattractants for host tropism in Orobanchaceae parasitic plants," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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