Actin organization during Eucalyptus root hair development and its response to fungal hypaphorine - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Plant Biology Année : 2006

Actin organization during Eucalyptus root hair development and its response to fungal hypaphorine

Résumé

The fungus Pisolithus microcarpus establishes an ectomycorrhiza with Eucalyptus globulus. This symbiosis involves a fungal synthesis and secretion of hypaphorine, an indolic compound. Previous studies have shown that hypaphorine induces an alteration in the actin cytoskeleton of elongating root hairs and inhibits hair elongation. Using an alternative approved method, we analyzed the effects of hypaphorine on the E. globulus root hair cyto-architecture and actin configuration in more detail and provide new results. One mM hypaphorine stops root hair elongation within 20 min, and changes the hair cyto-architecture. Semi-quantitative analysis of the actin cytoskeleton before and after treatment with hypaphorine shows that hypaphorine induces a shift from fine F-actin to F-actin bundles in the sub-apex of the hair, which occurs first in the mid-plane of the cell. This creates a sub-apical cell centre free of filamentous actin, an actin configuration that differs from that during developmental growth arrest. The mechanism of action of hypaphorine is discussed.

Dates et versions

hal-02659066 , version 1 (30-05-2020)

Identifiants

Citer

A. Dauphin, N.C.A. de Ruijter, A.M.C Emons, Valérie Legué. Actin organization during Eucalyptus root hair development and its response to fungal hypaphorine. Plant Biology, 2006, 8, pp.204-211. ⟨10.1055/s-2006-923767⟩. ⟨hal-02659066⟩
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