JXB Advance Access originally published online on July 2, 2004
Journal of Experimental Botany 2004 55(403):1707-1713; doi:10.1093/jxb/erh205
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RESEARCH PAPER |
Do iron plaque and genotypes affect arsenate uptake and translocation by rice seedlings (Oryza sativa L.) grown in solution culture?
1Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, China
2College of Natural Resources and Environment, Hebei Agricultural University, Baoding, Hebei Province, China
3Soil and Land Systems, School of Environmental Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
* To whom correspondence should be addressed. Fax: +86 10 6292 3563. E-mail: ygzhu{at}mail.rcees.ac.cn
The effects of Fe concentrations in the pretreatment solution on the induction of plaque and the differences between genotypes on arsenate uptake by and translocation within rice seedlings grown in nutrient solution in the greenhouse were investigated. After iron plaque on rice roots was induced in solutions containing 20, 40, 60, 80, and 100 mg Fe2+ l–1, seedlings were transplanted into nutrient solution with 0.5 mg As l–1. The formation of iron plaque was clearly visible as a reddish coating on the root surface after 12 h induction. Fe2+ concentrations in the pretreatment solution and 0.5 mg As l–1 in the treatment solutions did not significantly affect rice growth. There was a significant correlation between the concentrations of Fe and As in iron plaque on the root surface for the three genotypes. About 75–89% of total As was concentrated in iron plaque (DCB-extracts). There were no significant differences in As concentrations in the roots between the three genotypes; however, As concentrations in shoots differed significantly between them. Arsenic concentrations in shoots were positively correlated with iron concentrations in the shoots. The results suggest that iron plaque may act as a ‘buffer’ for As in the rhizosphere.
Key words: Arsenic translocation, arsenic uptake, iron plaque, rice genotypes
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