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Arsenate uptake and translocation in seedlings of two genotypes of rice is affected by external phosphate concentrations
Two genotypes of rice ( Oryza sativa L.), 94D-54 and 94D-64 were used to investigate the formation of iron plaque controlled by different phosphorus (P) concentrations and the effect of iron plaque on arsenate uptake in a hydroponic experiment. External P concentrations from 10 to 50 μM caused a mar...
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Published in: | Aquatic botany 2005-12, Vol.83 (4), p.321-331 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Two genotypes of rice (
Oryza sativa L.), 94D-54 and 94D-64 were used to investigate the formation of iron plaque controlled by different phosphorus (P) concentrations and the effect of iron plaque on arsenate uptake in a hydroponic experiment. External P concentrations from 10 to 50
μM caused a marked decrease in dithionite-citrate-bicarbonate (DCB)–Fe concentrations for both genotypes, but further increases from 50 to 300
μM only resulted in small decrease. Arsenic (As) concentrations in DCB-extracts were determined by the amounts of iron plaque and the adsorption capacity of As by iron plaque, and both controlled by external P concentrations. At 10
μM external P, genotype 94D-54 had higher Fe, As and P concentrations in DCB-extracts than genotype 94D-64, but the difference disappeared with increasing P concentrations. Increasing P concentrations decreased the percentages of As distributed in iron plaque from around 70 to 10%, and increased the percentages of As in roots and shoots gradually from around 20 to 60% for toots and from 5 to nearly 35% for shoots, respectively. Moreover, P concentration increased the molar ratio of shoot-to-root As, from 0.05 to nearly 0.2, indicating P concentration may promote As translocation from roots to shoots. |
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ISSN: | 0304-3770 1879-1522 |
DOI: | 10.1016/j.aquabot.2005.07.003 |