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2. A rice Serine/Threonine receptor-like kinase regulates arbuscular mycorrhizal symbiosis at the peri-arbuscular membrane

Author

Roth, Ronelle; https://orcid.org/0000-0001-5566-8954, Chiapello, Marco; https://orcid.org/0000-0001-7768-3047, Montero, Héctor; https://orcid.org/0000-0001-8590-6394, Gehrig, Peter, Grossmann, Jonas, O'Holleran, Kevin, Hartken, Denise, Walters, Fergus, Yang, Shu-Yi, Hillmer, Stefan, Schumacher, Karin, Bowden, Sarah; https://orcid.org/0000-0001-5105-076X, Craze, Melanie, Wallington, Emma J; https://orcid.org/0000-0003-3715-7901, Miyao, Akio; https://orcid.org/0000-0002-2822-2866, Sawers, Ruairidh, Martinoia, Enrico, Paszkowski, Uta; https://orcid.org/0000-0002-7279-7632, Roth, Ronelle; https://orcid.org/0000-0001-5566-8954, Chiapello, Marco; https://orcid.org/0000-0001-7768-3047, Montero, Héctor; https://orcid.org/0000-0001-8590-6394, Gehrig, Peter, Grossmann, Jonas, O'Holleran, Kevin, Hartken, Denise, Walters, Fergus, Yang, Shu-Yi, Hillmer, Stefan, Schumacher, Karin, Bowden, Sarah; https://orcid.org/0000-0001-5105-076X, Craze, Melanie, Wallington, Emma J; https://orcid.org/0000-0003-3715-7901, Miyao, Akio; https://orcid.org/0000-0002-2822-2866, Sawers, Ruairidh, Martinoia, Enrico, and Paszkowski, Uta; https://orcid.org/0000-0002-7279-7632

Abstract

In terrestrial ecosystems most plant species live in mutualistic symbioses with nutrient-delivering arbuscular mycorrhizal (AM) fungi. Establishment of AM symbioses includes transient, intracellular formation of fungal feeding structures, the arbuscules. A plant-derived peri-arbuscular membrane (PAM) surrounds the arbuscules, mediating reciprocal nutrient exchange. Signaling at the PAM must be well coordinated to achieve this dynamic cellular intimacy. Here, we identify the PAM-specific Arbuscular Receptor-like Kinase 1 (ARK1) from maize and rice to condition sustained AM symbiosis. Mutation of rice ARK1 causes a significant reduction in vesicles, the fungal storage structures, and a concomitant reduction in overall root colonization by the AM fungus Rhizophagus irregularis. Arbuscules, although less frequent in the ark1 mutant, are morphologically normal. Co-cultivation with wild-type plants restores vesicle and spore formation, suggesting ARK1 function is required for the completion of the fungal life-cycle, thereby defining a functional stage, post arbuscule development.

Published
2018

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