Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4555256 | Environmental and Experimental Botany | 2010 | 8 Pages |
Abstract
Changes in the leaf antioxidant metabolism upon exposure to salinity and potassium deficiency were investigated in the annual halophyte Hordeum maritimum L. Plants were hydroponically grown either with a complete nutrient solution containing 3Â mM K+ without (+K/âNaCl) or with 100Â mM NaCl (+K/+NaCl), or in K+-free medium containing 100Â mM NaCl (âK/+NaCl). Malondialdehyde (MDA), carbonyl group (CO), and hydrogen peroxide (H2O2) contents as well as antioxidant enzyme activities [superoxide dismutase (SOD; EC 1.15.1.1), catalase (CAT, EC 1.11.1.6), guaiacol peroxidase (GPX, EC 1.11.1.7), ascorbate peroxidase (APX, EC 1.11.1.11), monodehydroascorbate reductase (MDHAR, EC 1.6.5.4), dehydroascorbate reductase (DHAR, EC 1.8.5.1), and glutathione reductase (GR, EC 1.6.4.2)] and non-enzymatic antioxidant contents (ascorbate and glutathione) were determined. Plants exposed to salinity, either alone or in combination with K+ deprivation, showed enhanced lipid peroxidation along with higher antioxidative response. This tendency was generally more marked in âK/+NaCl plants as compared to +K/+NaCl plants. H2O2 concentration was negatively correlated with the plant antioxidative capacity, either enzymatic or non-enzymatic. As a whole, these data suggest that the enhancement of the antioxidative response is of crucial significance for H. maritimum plants growing under salinity and potassium deficiency.
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Authors
Chokri Hafsi, MarÃa C. Romero-Puertas, Dharmendra K. Gupta, Luis A. del RÃo, Luisa M. Sandalio, Chedly Abdelly,