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Published on July 9, 2008; 10.1104/pp.108.121400

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Received April 17, 2008
Accepted June 25, 2008

GR24, a synthetic analogue of strigolactones, stimulates the mitosis and growth of the arbuscular mycorrhizal fungus Gigaspora rosea by boosting its energy metabolism

Arnaud Besserer , Guillaume Becard *, Alain Jauneau , Christophe Roux , and Nathalie Sejalon-Delmas

Plant Cell Surfaces and Signaling Laboratory, UMR5546 CNRS/University of Toulouse, Pole de Biotechnologies Vegetales, 24, chemin de Borde Rouge, B.P. 42617 Auzeville, 31326 Castanet-Tolosan, France

* Corresponding author; email: becard{at}scsv.ups-tlse.fr.

Arbuscular mycorrhizal (AM) fungi are obligate biotrophs that participate in a highly beneficial root symbiosis with 80 % of land plants. Strigolactones are trace molecules in plant root exudates that are perceived by AM fungi at sub nanomolar concentrations. Within just a few hours, they were shown to stimulate fungal mitochondria, spore germination and branching of germinating hyphae. In the present study we show that treatment of Gigaspora rosea with a strigolactone analogue (GR24) causes a rapid increase in the NADH concentration, the NADH dehydrogenase activity and the ATP content of the fungal cell. This fully and rapidly (within minutes) activated oxidative metabolism does not require new gene expression. Up-regulation of the genes involved in mitochondrial metabolism and hyphal growth, and stimulation of the fungal mitotic activity, take place several days after this initial boost to the cellular energy of the fungus. Such a rapid and powerful action of GR24 on G. rosea cells suggests that strigolactones are important plant signals involved in switching arbuscular mycorrhizal fungi towards full germination and a pre-symbiotic state.






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