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Relationship between ammonium accumulation and senescence of detached rice leaves caused by excess copper

Relationship between ammonium accumulation and senescence of detached rice leaves caused by... The possibility that ammonium (NH 4 + ) accumulation is linked to the senescence of detached rice (Oryza sativa) leaves induced by copper (Cu) was investigated. CuSO 4 was effective in promoting senescence of detached rice leaves. Both CuSO 4 and CuCl 2 induced NH 4 + accumulation in detached rice leaves, indicating that NH 4 + accumulation is induced by copper. Sulfate salts of Mg, Mn, Zn, and Fe were ineffective in inducing NH 4 + accumulation in detached rice leaves. The senescence of detached rice leaves induced by Cu was found to be prior to NH 4 + accumulation. Free radical scavengers, such as glutathione and thiourea, inhibited senescence caused by Cu and at the same time inhibited Cu-induced NH 4 + accumulation. The current results suggest that NH 4 + accumulation is not associated with senescence induced by Cu, but is part of the overall expression of oxidative damage caused by an excess of Cu. Evidence was presented to show that copper-induced ammonium accumulation in detached rice leaves is attributed to a decrease in glutamine synthetase activity and an increase in reduction of nitrate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

Relationship between ammonium accumulation and senescence of detached rice leaves caused by excess copper

Chen, Li-Men; Huei Kao, Ching
Plant and Soil , Volume 200 (2) – Mar 1, 1998
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References (14)

Publisher
Springer Journals
Copyright
Copyright © 1998 by Kluwer Academic Publishers
Subject
Environment; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
DOI
10.1023/A:1004369518777
Publisher site
See Article on Publisher Site

Abstract

The possibility that ammonium (NH 4 + ) accumulation is linked to the senescence of detached rice (Oryza sativa) leaves induced by copper (Cu) was investigated. CuSO 4 was effective in promoting senescence of detached rice leaves. Both CuSO 4 and CuCl 2 induced NH 4 + accumulation in detached rice leaves, indicating that NH 4 + accumulation is induced by copper. Sulfate salts of Mg, Mn, Zn, and Fe were ineffective in inducing NH 4 + accumulation in detached rice leaves. The senescence of detached rice leaves induced by Cu was found to be prior to NH 4 + accumulation. Free radical scavengers, such as glutathione and thiourea, inhibited senescence caused by Cu and at the same time inhibited Cu-induced NH 4 + accumulation. The current results suggest that NH 4 + accumulation is not associated with senescence induced by Cu, but is part of the overall expression of oxidative damage caused by an excess of Cu. Evidence was presented to show that copper-induced ammonium accumulation in detached rice leaves is attributed to a decrease in glutamine synthetase activity and an increase in reduction of nitrate.

Journal

Plant and Soil – Springer Journals

Published: Mar 1, 1998

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