A GRAS-type transcription factor with a specific function in mycorrhizal signaling

Gobbato, Enrico, Marsh, John F, Vernié, Tatiana, Wang, Ertao, Maillet, Fabienne, Kim, Jiyoung, Miller, J Benjamin ORCID: https://orcid.org/0000-0003-0882-033X, Sun, Jongho, Bano, S Asma, Ratet, Pascal, Mysore, Kirankumar S, Dénarié, Jean, Schultze, Michael and Oldroyd, Giles E D (2012) A GRAS-type transcription factor with a specific function in mycorrhizal signaling. Current Biology, 22 (23). pp. 2236-2241. ISSN 0960-9822

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Abstract

Legumes establish mutualistic associations with mycorrhizal fungi and with nitrogen-fixing rhizobial bacteria. These interactions occur following plant recognition of Nod factor from rhizobial bacteria and Myc factor from mycorrhizal fungi. A common symbiosis signaling pathway is involved in the recognition of both Nod factor and Myc factor and is required for the establishment of these two symbioses. The outcomes of these associations differ, and therefore, despite the commonality in signaling, there must be mechanisms that allow specificity. In Nod factor signaling, a complex of GRAS-domain transcription factors controls gene expression downstream of the symbiosis signaling pathway. Here, we show that a GRAS-domain transcription factor, RAM1, functions in mycorrhizal-specific signaling. Plants mutated in RAM1 are unable to be colonized by mycorrhizal fungi, with a defect in hyphopodia formation on the surface of the root. RAM1 is specifically required for Myc factor signaling and appears to have no role in Nod factor signaling. RAM1 regulates the expression of RAM2, a glycerol-3-phosphate acyl transferase that promotes cutin biosynthesis to enhance hyphopodia formation. We conclude that mycorrhizal signaling downstream of the symbiosis-signaling pathway has parallels with nodulation-specific signaling and functions to promote mycorrhizal colonization by regulating cutin biosynthesis.

Item Type:	Article
Additional Information:	Copyright © 2012 Elsevier Ltd. All rights reserved. Available under Elsevier's end user licence: http://www.elsevier.com/open-access/userlicense/1.0/
Uncontrolled Keywords:	gene expression regulation, plant,glycerol-3-phosphate o-acyltransferase,membrane lipids,molecular sequence data,mycorrhizae,plant proteins,plant root nodulation,signal transduction,symbiosis,transcription factors
Faculty \ School:	Faculty of Science > School of Biological Sciences
UEA Research Groups:	Faculty of Science > Research Groups > Molecular Microbiology Faculty of Science > Research Groups > Plant Sciences
Depositing User:	Pure Connector
Date Deposited:	10 Aug 2015 16:24
Last Modified:	25 Sep 2024 11:52
URI:	https://ueaeprints.uea.ac.uk/id/eprint/54075
DOI:	10.1016/j.cub.2012.09.044

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