Peroxisomes as Cell Generators of Reactive Nitrogen Species (RNS) Signal Molecules
Nitric oxide is a gaseous free radical with a wide range of direct and indirect actions in plant cells. However, the enzymatic sources of NO and its subcellular localization in plants are still under debate. Among the different subcellular compartments where NO has been found to be produced, peroxisomes are the best characterized since in these organelles it has been demonstrated the presence of NO and it has been biochemically characterized a L-arginine-dependent nitric oxide synthase activity. This chapter summarizes the present knowledge of the NO metabolism and its derived reactive nitrogen species (RNS) in plant peroxisomes and how this gaseous free radical is involved in natural senescence, and is released to the cytosol under salinity stress conditions acting as a signal molecule.
KeywordsNitric oxide Nitric oxide synthase Nitrosative stress NOS Peroxisomes Reactive nitrogen species RNS Salinity S-nitrosothiols
Work in our laboratories was supported by ERDF-cofinanced grants from the Ministry of Science and Innovation (projects BIO2009-12003-C02-01 and BIO2009-12003-C02-02, and ACI2009-0860) and Junta de Andalucía (groups BIO-192 and BIO-286), Spain.
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