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Dialogue moléculaire au cours de l'ontogénèse ectomycorhizienne : accumulation et activité anti-auxinique de l'hypaphorine, approches physiologique et génomique

Abstract : Some steps of the ectomycorrhizae ontogenesis would require a subtle balance between active molecules such as IAA and regulating molecules such as hypaphorine, an indolic alkaloid synthesised and accumulated in large quantities by Pisolithus in contact with the host plant. Here the up-regulating activity of jasmonates on hypaphorine synthesis in Pisolithus hyphae was evidenced; a new class of IAA competitive-antagonists has been identified, the indole alkaloids. The activity of hypaphorine or/and IAA on gene expression in poplar roots, has been folowed. Amongst121 EST differentially expressed, only one coding for an extensinlike protein was regulated the opposite ways by both antagonist molecules. With hypaphorine, and some indole alkaloids, opens a new range of investigation of IAA activities.
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https://hal.univ-lorraine.fr/tel-01748109
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Anne Jambois. Dialogue moléculaire au cours de l'ontogénèse ectomycorhizienne : accumulation et activité anti-auxinique de l'hypaphorine, approches physiologique et génomique. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10190⟩. ⟨tel-01748109⟩

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