Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 65, Issue 5, Pages 1361-1375Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ert460
Keywords
Calcium; hyperosmotic stress; mitochondria; NaCl; Nicotiana tabacum; non-selective cation channels; programmed cell death; reactive oxygen species
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Funding
- Japan Society for the Promotion of Science
- Fondo Giovani, Ministry of Education, Universities and Research (MUIR)
- Ministry of Education, Universities and Research (MUIR)
- European Commission [293431]
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Hyperosmotic stresses represent one of the major constraints that adversely affect plants growth, development, and productivity. In this study, the focus was on early responses to hyperosmotic stress- (NaCl and sorbitol) induced reactive oxygen species (ROS) generation, cytosolic Ca-2 concentration ([Ca-2](cyt)) increase, ion fluxes, and mitochondrial potential variations, and on their links in pathways leading to programmed cell death (PCD). By using BY-2 tobacco cells, it was shown that both NaCl- and sorbitol-induced PCD seemed to be dependent on superoxide anion (O-2) generation by NADPH-oxidase. In the case of NaCl, an early influx of sodium through non-selective cation channels participates in the development of PCD through mitochondrial dysfunction and NADPH-oxidase-dependent O-2 generation. This supports the hypothesis of different pathways in NaCl- and sorbitol-induced cell death. Surprisingly, other shared early responses, such as [Ca-2](cyt) increase and singlet oxygen production, do not seem to be involved in PCD.
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