Martos 2015 Plant Physiol Biochem

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Martos GG, Terán Mdel M, Díaz Ricci JC (2015) The defence elicitor AsES causes a rapid and transient membrane depolarization, a triphasic oxidative burst and the accumulation of nitric oxide. Plant Physiol Biochem 97:443-50.

» PMID: 26562675

Martos GG, Teran Mdel M, Diaz Ricci JC (2015) Plant Physiol Biochem

Abstract: The newly characterized elicitor AsES obtained from Acremonium strictum induces a strong defence response in strawberry plants and confers plants resistance against the fungal pathogen Colletotricum acutatum the casual agent of anthracnose disease. Previous studies showed that AsES causes the accumulation of reactive oxygen species (ROS) that peaked 4 h post treatment (hpt), but due to the experimental approach used it was not clear whether the accumulation of ROS observed was intracellular or extracellular or took place as a single peak. By using a different experimental setup, a more complex early events associated to the activation of the innate immunity were observed. In this paper we report that strawberry plant cells treated with AsES exhibits a triphasic production of H2O2 and a rapid intracellular accumulation of NO. The first phase consists in a progressive extracellular accumulation of H2O2 that starts immediately after the treatment with AsES and is preceded by a rapid and transient cell membrane depolarization. During this phase takes place also a rapid intracellular accumulation of NO. Microscopic observations of mesophyll cells treated with AsES reveals that NO accumulates at the chloroplast. After the first extracellular H2O2 production phase, two intracellular H2O2 accumulation events occur, the first 2 hpt, and the second 7 hpt. Cells treated with AsES also show a transient increase of ion leakage, and a progressive alkalinization of the extracellular medium.

Keywords: Elicitor, Innate immunity, Oxidative burst, Strawberry, Mesophyll cells


Labels: MiParea: Respiration  Pathology: Infectious  Stress:Oxidative stress;RONS  Organism: Plants 

Preparation: Intact cells 


Coupling state: ROUTINE 

HRR: Oxygraph-2k 

2015-12