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

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, Giles Oldroyd and Uta. Paszkowski ()
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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
Emily K. Servante: Department of Plant Sciences, University of Cambridge
Boas Pucker: Department of Plant Sciences, University of Cambridge
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
Uta. Paszkowski: Department of Plant Sciences, University of Cambridge

Nature Communications, 2020, vol. 11, issue 1, 1-13

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-16021-1

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