University of Cambridge > > Plant Sciences Departmental Seminars > Identification of a suppressor of arbuscular mycorrhizal fungal symbiosis in rice

Identification of a suppressor of arbuscular mycorrhizal fungal symbiosis in rice

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Arbuscular mycorrhizal (AM) colonization is the most common form of plant symbiosis on earth, with over 80% of terrestrial plants and approximate 200 species of fungi participating in this relationship. In soil, the fungal spores germinate and colonize host roots to form tree-like structures called arbuscules in the inner cortical cells where the fungi provide plants with essential minerals. In exchange, plants provide fungi with carbon produced during photosynthesis. Until recently the host components that recognize the AM fungi were unknown. Interestingly, we identified that the receptor complex previously described to detect the smoke derived germination promoting compound, karrikin, is also involved in the perception of the fungus. The plant receptor, Dwarf 14-Like (D14L), belongs to an alpha beta fold hydrolase family and d14l mutants completely lose susceptibility to AM fungi. In karrikin perception, Suppressor of MAX2 1 (SMAX1) acts as a negative regulator. We found indeed SMAX1 also functions as a negative regulator of fungal perception acting downstream of D14L receptor complex. In conclusion, we have identified SMAX1 as a negative regulator of AM symbiosis, which will help unravel the molecular details of this widespread symbiotic relationship.

This talk is part of the Plant Sciences Departmental Seminars series.

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