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Jambois, A; Lapeyrie, F. 2005. Jasmonates, together with zeatin, induce hypaphorine accumulation by the ectomycorrhizal fungus Pisolithus microcarpus. SYMBIOSIS. 39(3):137-141. Address: Lapeyrie, F, UHP Interact Arbres Microorganismes, Inst Natl Rech Agron, INRA, Unite Mixte Rech, F-54280 Seichamps, France
Jasmonates have been reported to stimulate accumulation of indole alkaloids in plant cells. We demonstrated that jasmonic acid and methyl jasmonate applications result in increased hypaphorine concentration in Pisolithus microcarpus hyphae. Looking for synergetic effects we found that jasmonic acid and zeatin may contribute additively to hypaphorine accumulation. Both plant hormones were found in root exudates and must contribute to induce hypaphorine over-accumulation in symbiotic hyphae. In return, fungal hypaphorine was shown earlier to regulate auxin activity in host plant tissues during early stages of ectomycorrhiza ontogenesis. Jasmonates and zeatin might therefore contribute to some steps of molecular dialogue, which modulates the development of functional ectomycorrhizae and maintain symbiotic hyphae in a characteristic juvenile stage.
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