Activation of symbiosis signaling by arbuscular mycorrhizal fungi in legumes and rice

Sun, Jongho, Miller, J Benjamin, Granqvist, Emma, Wiley-Kalil, Audrey, Gobbato, Enrico, Maillet, Fabienne, Cottaz, Sylvain, Samain, Eric, Venkateshwaran, Muthusubramanian, Fort, Sébastien, Morris, Richard J, Ané, Jean-Michel, Dénarié, Jean and Oldroyd, Giles E D (2015) Activation of symbiosis signaling by arbuscular mycorrhizal fungi in legumes and rice. The Plant Cell, 27 (3). pp. 823-838. ISSN 1040-4651

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Abstract

Establishment of arbuscular mycorrhizal interactions involves plant recognition of diffusible signals from the fungus, including lipochitooligosaccharides (LCOs) and chitooligosaccharides (COs). Nitrogen-fixing rhizobial bacteria that associate with leguminous plants also signal to their hosts via LCOs, the so-called Nod factors. Here, we have assessed the induction of symbiotic signaling by the arbuscular mycorrhizal (Myc) fungal-produced LCOs and COs in legumes and rice (Oryza sativa). We show that Myc-LCOs and tetra-acetyl chitotetraose (CO4) activate the common symbiosis signaling pathway, with resultant calcium oscillations in root epidermal cells of Medicago truncatula and Lotus japonicus. The nature of the calcium oscillations is similar for LCOs produced by rhizobial bacteria and by mycorrhizal fungi; however, Myc-LCOs activate distinct gene expression. Calcium oscillations were activated in rice atrichoblasts by CO4, but not the Myc-LCOs, whereas a mix of CO4 and Myc-LCOs activated calcium oscillations in rice trichoblasts. In contrast, stimulation of lateral root emergence occurred following treatment with Myc-LCOs, but not CO4, in M. truncatula, whereas both Myc-LCOs and CO4 were active in rice. Our work indicates that legumes and non-legumes differ in their perception of Myc-LCO and CO signals, suggesting that different plant species respond to different components in the mix of signals produced by arbuscular mycorrhizal fungi.

Item Type: Article
Additional Information: © 2015 American Society of Plant Biologists. All rights reserved. The article can be viewed online without restriction.
Faculty \ School: Faculty of Science > School of Biological Sciences

Faculty of Science > School of Computing Sciences
Faculty of Science > School of Mathematics
Depositing User: Pure Connector
Date Deposited: 30 Oct 2015 14:00
Last Modified: 28 Oct 2019 15:10
URI: https://ueaeprints.uea.ac.uk/id/eprint/54961
DOI: 10.1105/tpc.114.131326

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