Effect of salt stress on antioxidant system of plants as related to nitrogen nutrition

Effect of salt stress on antioxidant system of plants as related to nitrogen nutrition In plants of wheat (Triticum aestivum L.) grown in the media with nitrate (NO 3 − plants), ammonium (NH 4 + plants), and without nitrogen (N-deficient plants), the response to oxidative stress induced by the addition of 300 mM NaCl to the nutrient solution was investigated. Three-day-long salinization induced chlorophyll degradation and accumulation of malondialdehyde (MDA) in the leaves. These signs of oxidative stress were clearly expressed in NO 3 − and N-deficient plants and weakly manifested in NH 4 + plants. In none of the treatments, salinization induced the accumulation of MDA in the roots. Depending on the conditions of N nutrition, salt stress was accompanied by diverse changes in the activity of antioxidant enzymes in the leaves and roots. Resistance of leaves of NH 4 + plants to oxidative stress correlated with a considerable increase in the activities of ascorbate peroxidase and glutathione reductase. Thus, wheat plants grown on the NH 4 + -containing medium were more resistant to the development of oxidative stress in the leaves than those supplied with nitrate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effect of salt stress on antioxidant system of plants as related to nitrogen nutrition

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2006 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443706020063
Publisher site
See Article on Publisher Site

Abstract

In plants of wheat (Triticum aestivum L.) grown in the media with nitrate (NO 3 − plants), ammonium (NH 4 + plants), and without nitrogen (N-deficient plants), the response to oxidative stress induced by the addition of 300 mM NaCl to the nutrient solution was investigated. Three-day-long salinization induced chlorophyll degradation and accumulation of malondialdehyde (MDA) in the leaves. These signs of oxidative stress were clearly expressed in NO 3 − and N-deficient plants and weakly manifested in NH 4 + plants. In none of the treatments, salinization induced the accumulation of MDA in the roots. Depending on the conditions of N nutrition, salt stress was accompanied by diverse changes in the activity of antioxidant enzymes in the leaves and roots. Resistance of leaves of NH 4 + plants to oxidative stress correlated with a considerable increase in the activities of ascorbate peroxidase and glutathione reductase. Thus, wheat plants grown on the NH 4 + -containing medium were more resistant to the development of oxidative stress in the leaves than those supplied with nitrate.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Mar 24, 2006

References

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