Polyphosphate has a central role in the rapid and massive accumulation of phosphorus in extraradical mycelium of an arbuscular mycorrhizal fungus

Hijikata, Nowaki, Murase, Masatake, Tani, Chiharu, Ohtomo, Ryo, Osaki, Mitsuru, Ezawa, Tatsuhiro

The dynamics of polyphosphate with respect to toal phosphorus and orthophosphate levels in an arbuscular mycorrhizal association were investigated to clarify the role of polyphosphate in the symbiotic phospharus-translocation.Lotus japonicus was inoculated with Glomus sp. HR1 and grown in a two- compartment culture system in which hyphal and mycorrhizal compartments were separated by nylon mesh bags. Extraradical hyphae and mycorrhizal roots were collected from the hyphal and mycorrhizal compartments, respectively, at one h interval after phosphate application to the hyphal compartment, and polyphosphate, total phosphorus and orthophosphate levels were determined. Total phosphorus and polyphosphate levels in hyphae in the hyphal compartment increased and decreased synchronously after phosphate application, while orthophosphate levels remained constant at lower levels. The level of polyphosphate reached 64% of total phosphorus 5 h after phosphate application. Decreases in polyphosphate in hyphae in the hyphal compartment were concurrent with increases in polyphosphate in the mycorrhizal roots + hyphae in the mycorrhizal compartment. The present study demonstrated that the potential capacity of arbuscular mycorrhizal fungal cell for polyphosphate accumulation was much larger than those reported previously and suggested that polyphosphate plays a central role in the mediation of long-distance phosphorus-translocation through hyphae.

Polyphosphate has a central role in the rapid and massive accumulation of phosphorus in extraradical mycelium of an arbuscular mycorrhizal fungus

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