Cysteine: A multifaceted amino acid involved in signaling, plant resistance and antifungal development

Plant Physiology and Biochemistry : PPB
Gabriel RoblinJean-Marc Berjeaud

Abstract

Early effects induced by cysteine were monitored using the model of Mimosa pudica pulvinar cells. Rapid dose-dependent membrane depolarization (within seconds) and modification of proton secretion (within minutes) were triggered at cysteine concentrations higher than 0.1 mM. These effects did not result from a modification of the plasma membrane H+-ATPase activity nor from a protonophore effect as shown by assays on plasma membrane vesicles isolated from pulvinar tissues. In a 0.5-10 mM range, cysteine inhibited the ion-driven turgor-mediated seismonastic reaction of Mimosa pudica primary pulvini and the dark-induced movement of Cassia fasciculata leaflets. At concentrations higher than 1 mM, it induced a long-lasting leaflet necrosis dependent on the concentration and treatment duration. Electron microscopy showed that cysteine induced important damage in the nucleus, mitochondria, endoplasmic reticulum and Golgi of the M. pudica motor cell. Cysteine inhibited in a concentration-dependent manner, from 0.5 to 20 mM, both the mycelial growth and the spore germination of the fungal pathogens Phaeomoniella chlamydospora and Phaeoacremonium minimum implicated in esca disease of grapevines. Using [35S] cysteine, we showed that the a...Continue Reading

Citations

Jun 7, 2019·International Journal of Environmental Research and Public Health·Dario FancelloGiovanni De Giudici
Jul 9, 2020·Frontiers in Plant Science·Qingqing YangQiaoquan Liu
Sep 2, 2019·Plant Physiology and Biochemistry : PPB·Fabienne DédaldéchampGabriel Roblin

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