Transport of Trace Elements through the Hyphae of an Arbuscular Mycorrhizal Fungus into Marigold Determined by the Multitracer Technique

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The contribution of the hyphae of an arbuscular mycorrhizal (AM) fungus to the uptake of trace elements by marigold ( Tagetes patula L.) was studied using a multitracer consisting of radionuclides of ^7Be, ^<22>Na, ^<46>Sc, ^<51>Cr, ^<54>Mn, ^<59>Fe, ^<56>Co, ^<65>Zn, ^<75>Se, ^<83>Rb, ^<85>Sr, ^<88>Y, ^<88> Zr, and ^<95m>Tc. Marigold plants colonized and not colonized with Glomus etunicatum were grown for 40 and 60 d in pots with a hyphal compartment separated from the rooting medium by a fine nylon mesh. The multitracer was applied to the hyphal compartment. We found that the uptake of ^<22>Na, ^<65>Zn, ^<75>Se, ^<83>Rb, ^<85>Sr, and ^<88>Y by the mycorrhizal plants was higher than that by the non-mycorrhizal ones. In the case of ^<95m>Tc, the uptake by the mycorrhizal plants was similar to that by the control ones. The radioactivity of ^<7>Be, ^<46>Sc, ^<51>Cr, ^<54>Mn, ^<59>Fe, ^<56>Co, and ^<88>Zr could not be detected in any plants. Our results suggest that the AM fungus can absorb Na, Zn, Se, Rb, Sr, and Y from the soil and transport these elements to the plant througlt its hyphae. The transport ability of the AM fungal hyphae to plant for Be, Sc, Cr, Mn, In, Fe, Co, Zr, and Tc is likely to be low.
社団法人日本土壌肥料学会の論文