Abstract
In this study, we examined interaction between cadmium (Cd) and temperature in rice seedlings. Effects of CdCl2 (0.5 mM) simultaneously applied at high (35/30°C day/night), medium (25/20°C) and low (15/13°C) temperatures to rice seedlings were detected by measuring changes in biomass production and NH +4 content. Results indicated that Cd-induced biomass reduction and NH +4 accumulation increased in parallel with temperature increases. On treatment with CdCl2, the abscisic acid (ABA) content markedly increased in the leaves of seedlings grown at high temperature but not at medium and low temperatures. Exogenous application of ABA at medium temperature increased ABA and NH +4 contents in the leaves of rice seedlings. Fluridone (Flu) treatment, an inhibitor of carotenoid biosynthesis, reduced ABA content, as well as Cd-induced NH + 4 accumulation in the leaves of rice seedlings grown at high temperature. These Flu effects can be reversed by application of ABA. Furthermore, Flu treatment did not reduce Cd content in leaves of seedlings grown at high temperature. All these results suggest that Cd-induced NH +4 accumulation at high temperature is mediated through ABA.
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Abbreviations
- ABA:
-
Abscisic acid
- DW:
-
Dry weight
- ELISA:
-
Enzyme-linked immunosorbent assay
- Flu:
-
Fluridone
- GS:
-
Glutamine synthetase
- NCED:
-
9-cis-epoxycarotenoid dioxygenase
- PAL :
-
Phenylalanine ammonia-lyase
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This work was supported by a research grant from the National Science Council of the Republic of China.
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Hsu, Y.T., Kuo, M.C. & Kao, C.H. Cadmium-induced ammonium ion accumulation of rice seedlings at high temperature is mediated through abscisic acid. Plant Soil 287, 267–277 (2006). https://doi.org/10.1007/s11104-006-9076-5
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DOI: https://doi.org/10.1007/s11104-006-9076-5