NDLI: Oxidative stress and fluctuations of free and conjugated polyamines in the halophyte Mesembryanthemum crystallinum L. under NaCl salinity

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Oxidative stress and fluctuations of free and conjugated polyamines in the halophyte Mesembryanthemum crystallinum L. under NaCl salinity

Content Provider	Springer Nature Link
Author	Shevyakova, Nina I. Rakitin, Victor Yu. Stetsenko, Larisa A. Arova, Evgeniya E. Kuznetsov, Vladimir V.
Copyright Year	2006
Abstract	The accumulation of conjugated and free polyamines in plants is very important for their protection against oxidative stress induced by abiotic factors. In the present study, the species halophytic plant Mesembryanthemum crystallinum L. was used as a model system in which the process of Crassulacean Acid Metabolism induction is linked with oxidative stress, especially under salinity conditions. A comparative analysis of the content of free polyamines, perchloric (PCA)-soluble and PCA-insoluble conjugated polyamines in mature leaves and roots was carried out with plants exposed to salinity. It was found that adult leaves and roots under normal conditions or salinity (400 mM NaCl) contained all types of free polyamines (putrescine, spermidine, spermine, and cadaverine). In leaves only PCA-insoluble conjugates were found, which showed a tendency to grow with increased duration of salt action (1.5–48 h). In contrast to leaves, in roots all forms of polyamine conjugates (PCA-soluble and -insoluble) were detected. However, the formation of all conjugates, especially PCA-soluble forms in roots, was sharply inhibited by salt shock (400 mM NaCl, 1.5 h) or exogenous cadaverine (1 mM) treatment. PCA-soluble conjugates of cadaverine in roots were found only when the treatment was carried out in combination with aminoguanidine (1 mM), as a result of diamine oxidase inhibition and consequently a decreasing of H2O2 production in plant cells. The activation of diamine oxidase and guaiacol peroxidase by NaCl or exogenous cadaverine was observed in leaves and roots. Thus, the activation of oxidative degradation of polyamines combined with H2O2–peroxidase reaction in cells are involved in the regulation of free and conjugated polyamines titers under salinity.
Starting Page	69
Ending Page	78
Page Count	10
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	50
Issue Number	1
e-ISSN	15735087
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-10-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Free and conjugated polyamines Salt and oxidative stresses Mesembryanthemum crystallinum L. Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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Oxidative stress and fluctuations of free and conjugated polyamines in the halophyte Mesembryanthemum crystallinum L. under NaCl salinity

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