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Abstract Detail


Heavy Metals and Phytoremediation

Hsu, Yi Ting [1], Kuo, Mei Chun [1], Kao, Ching-Huei [2].

Cadmium-induced ammonium ion accumulation of rice seedlings at high temperature is mediated through abscisic acid.

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℃ day/night), medium (25/20℃) and low (15/13℃) temperatures to rice seedlings were detected by measuring changes in biomass production and NH4+ content. Results indicated that Cd-induced biomass reduction and NH4+ 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 NH4+ contents in the leaves of rice seedlings. Fluridone treatment, an inhibitor of carotenoid biosynthesis, reduced ABA content, as well as Cd-induced NH4+ accumulation in the leaves of rice seedlings grown at high temperature. These fluridone effects can be reversed by application of ABA. Furthermore, fluridone treatment did not reduce Cd content in leaves of seedlings grown at high temperature. All these results suggest that Cd-induced NH4+ accumulation at high temperature is mediated through ABA.


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1 - National Taiwan University, Department of Agronomy
2 - National Taiwan University, Department of Agronomy, 1, Sec 4, Roosevelt Rd, Taipei, Taipei, 106, Taiwan

Keywords:
Abscisic Acid
ammonium ion
Cadmium
Oryza sativa
temperature.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P05017
Abstract ID:747


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