18 December 2015

Rice Perception of Symbiotic Arbuscular Mycorrhizal Fungi Requires the Karrikin Receptor Complex

Caroline Gutjahr, Enrico Gobbato, Jeongmin Choi, Michael Riemann, Matthew G. Johnston, William Summers, Samy Carbonnel, Catherine Mansfield, Shu-Yi Yang, Marina Nadal, Ivan Acosta, Makoto Takano, Wen-Biao Jiao, Korbinian Schneeberger, Krystyna A. Kelly and Uta Paszkowski - Science, 2015


In terrestrial ecosystems, plants take up phosphate predominantly via association with arbuscular mycorrhizal fungi (AMF). We identified loss of responsiveness to AMF in the rice (Oryza sativa) mutant hebiba, reflected by the absence of physical contact and of characteristic transcriptional responses to fungal signals. Among the 26 genes deleted in hebibaDWARF 14 LIKE is, the one responsible for loss of symbiosis . It encodes an alpha/beta-fold hydrolase, that is a component of an intracellular receptor complex involved in the detection of the smoke compound karrikin. Our finding reveals an unexpected plant recognition strategy for AMF and a previously unknown signaling link between symbiosis and plant development.

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