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Theses

Etude des voies de signalisation induites par l'hypaphorine fongique sur la croissance apicale des poils absorbants

Abstract : Hypaphorine is an indole compound secreted by the fungus Pisolithus tinctorius to the host plant Eucalyptus globulus during the establishment of an ectomycorrhiza. Hypaphorine inhibits root hair tip growth and the aim of this work is to understand the signalisation pathway involved in this inhibition. Hypaphorine-induced inhibition is rapid and coincides with a transient depolarisation of the plasma membrane and a cytoplasmic calcium increase abolishing the calcium gradient in root hair. Microscopy dye images revealed that hypaphorine induces an aggregation of actin filaments and hinders vesicle accumulation in the apical growing region. Hypaphorine action could be the result of an indole-3-acetic acid (IAA) antagonism as it effects on growth, actin cytoskeleton organisation and vesicle accumulation are counteracted by IAA.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0201_DAUPHIN.pdf
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https://hal.univ-lorraine.fr/tel-01746713
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Submitted on : Thursday, March 29, 2018 - 10:43:09 AM
Last modification on : Friday, February 5, 2021 - 3:42:59 AM

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  • HAL Id : tel-01746713, version 1
  • PRODINRA : 15936

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Aurélien Dauphin. Etude des voies de signalisation induites par l'hypaphorine fongique sur la croissance apicale des poils absorbants. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10201⟩. ⟨tel-01746713⟩

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