Early changes in membrane permeability, production of oxidative burst and modification of PAL activity induced by ergosterol in cotyledons of Mimosa pudica

Journal of Experimental Botany
Stéphanie RossardGabriel Roblin

Abstract

Ergosterol (a fungal membrane component) was shown to induce transient influx of protons and membrane hyperpolarization in cotyledonary cells of Mimosa pudica L. By contrast, chitosan (a fungal wall component with known elicitor properties) triggered membrane depolarization. In the processes induced by ergosterol, a specific desensitization was observed, since cells did not react to a second ergosterol application but did respond to a chitosan treatment. This comparative study correspondingly shows that ergosterol and chitosan were perceived in a distinct manner by plant cells. Generation of O2*-, visualized by infiltration with nitroblue tetrazolium, was displayed in organs treated with ergosterol and chitosan. This AOS production was preceded by an increase in activity of NADPH oxidase measured in protein extracts of treated cotyledons. In all the previously described processes, cholesterol had no effect, thereby indicating that ergosterol specifically induced these physiological changes known to participate in the reaction chain activated by characteristic elicitors. Contrary to chitosan, ergosterol did not greatly activate secondary metabolism as shown by the small change in content of free phenolics and by the low modifica...Continue Reading

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Citations

Mar 23, 2010·Journal of Experimental Botany·Stéphanie RossardRossitza Atanassova
May 3, 2011·Plant Physiology and Biochemistry : PPB·Parul VatsaGabriel Roblin
Mar 12, 2008·Physiologia Plantarum·Anna AmtmannPatrick Armengaud
Feb 18, 2014·Molecular Plant Pathology·Robyn L KlemptnerLizelle A Piater
Apr 17, 2015·Environmental Science and Pollution Research International·Benchohra MaamarMohammed Ait hammou
Oct 8, 2013·Plant Physiology and Biochemistry : PPB·Katerina DadakovaTomas Kasparovsky
Mar 17, 2019·International Journal of Molecular Sciences·Thembisile G KhozaLizelle A Piater
Aug 23, 2019·Journal of Integrative Plant Biology·Laura LindoSantiago Gutiérrez
Mar 1, 2009·Functional Plant Biology : FPB·Christophe ValtaudAndrée Bourbouloux

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