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Ethylene promotes SMAX1 accumulation to inhibit arbuscular mycorrhiza symbiosis

Author

Listed:
  • Debatosh Das

    (LMU Munich
    Redox Bio-Nutrients)

  • Kartikye Varshney

    (Technical University of Munich (TUM)
    Max-Planck-Institute of Molecular Plant Physiology)

  • Satoshi Ogawa

    (University of California
    RIKEN Center for Sustainable Resource Science
    Kyoto University)

  • Salar Torabi

    (LMU Munich
    Technical University of Munich (TUM))

  • Regine Hüttl

    (Technical University of Munich (TUM))

  • David C. Nelson

    (University of California)

  • Caroline Gutjahr

    (LMU Munich
    Technical University of Munich (TUM)
    Max-Planck-Institute of Molecular Plant Physiology)

Abstract

Most land plants engage in arbuscular mycorrhiza (AM) symbiosis with Glomeromycotina fungi for better access to mineral nutrients. The plant hormone ethylene suppresses AM development, but a molecular explanation for this phenomenon is lacking. Here we show that ethylene inhibits the expression of many genes required for AM formation in Lotus japonicus. These genes include strigolactone biosynthesis genes, which are needed for fungal activation, and Common Symbiosis genes, which are required for fungal entry into the root. Application of strigolactone analogs and ectopic expression of the Common Symbiosis gene Calcium Calmodulin-dependent Kinase (CCaMK) counteracts the effect of ethylene. Therefore, ethylene likely inhibits AM development by suppressing expression of these genes rather than by inducing defense responses. These same genes are regulated by SUPPRESSOR OF MAX2 1 (SMAX1), a transcriptional repressor that is proteolyzed during karrikin signaling. SMAX1 is required for suppression of AM by ethylene, and SMAX1 abundance in nuclei increases after ethylene application. We conclude that ethylene suppresses AM by promoting accumulation of SMAX1. SMAX1 emerges as a signaling hub that integrates karrikin and ethylene signaling, thereby orchestrating development of a major plant symbiosis with a plant’s physiological state.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57222-w
    DOI: 10.1038/s41467-025-57222-w
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    References listed on IDEAS

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