Abstract
Effect of nitrogen (N) deficiency on antioxidant status and Cd toxicity in rice seedlings was investigated. N deficiency resulted in a reduction of shoot growth but not root growth. The contents of N-containing compounds such as nitrate, chlorophyll, and protein decreased in leaves of rice seedlings grown under N deficiency. Accumulation of abscisic acid and H2O2 in leaves was induced by N deficiency. The content of ascorbate and the activities of ascorbate peroxidase, glutathione reductase, and catalase in N-deficient leaves were lower than their respective control leaves. However, glutathione content was not affected and superoxide dismutase activity was increased by N deficiency. Cd toxicity in N-deficient seedlings was more pronounced than that in N-sufficient ones. Pretreatment with ascorbate or L-galactono-1,4-lactone, a biosynthetic precursor of ascorbate resulted in a reduction of Cd toxicity enhanced by N deficiency. N deficiency also resulted in an enhancement of Cd uptake in rice seedlings. The possible mechanism of Cd toxicity enhanced by N deficiency is discussed.
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Abbreviations
- ABA:
-
Abscisic acid
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbic acid
- CAT:
-
Catalase
- DAB:
-
3,3-Diaminobenzidine
- DHA:
-
Dehydroascorbate
- DW:
-
Dry weight
- ELISA:
-
Enzyme-linked immunosorbent assay
- FW:
-
Fresh weight
- GalL:
-
L-galactono-1,4-lactone
- GR:
-
Glutathione reductase
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidized glutathione
- ROS:
-
Reactive oxygen species
- MDA:
-
Malondialdehyde
- SOD:
-
Superoxide dismutase
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This work was supported financially by the National Science Council of the Republic of China (NSC 98-2313-B002-008).
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Lin, YL., Chao, YY., Huang, WD. et al. Effect of nitrogen deficiency on antioxidant status and Cd toxicity in rice seedlings. Plant Growth Regul 64, 263–273 (2011). https://doi.org/10.1007/s10725-011-9567-0
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DOI: https://doi.org/10.1007/s10725-011-9567-0