Effects of Iron and Manganese Plaques on Arsenic Uptake by Rice Seedlings (Oryza sativa L.) Grown in Solution Culture Supplied with Arsenate and Arsenite |
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Authors: | W-J Liu Y-G Zhu FA Smith |
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Institution: | (1) Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, China;(2) College of Natural Resources and Environment, Hebei Agricultural University, Baoding, Hebei Province, China;(3) Soil and Land Systems, School of Environmental Sciences, The University of Adelaide, 5005 Adelaide, South Australia, Australia |
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Abstract: | We have shown previously that phosphorus nutrition and iron plaque on the surface of rice roots influence arsenate uptake
and translocation by rice in hydroponic culture. We have now investigated the role of iron (Fe) and manganese (Mn) plaque
on arsenate and arsenite uptake and translocation in rice seedlings grown hydroponically. Fe and Mn plaques were clearly visible
as reddish or brown coatings on the root surface after 12 h induction, and Fe plaque was much more apparent than Mn plaque.
Arsenite or arsenate supply did not decrease plant dry weights significantly. There were significant differences in shoot
dry weights but little difference in root dry weights between some plaque treatments. Arsenic (As) concentrations in Fe plaque
when arsenate was supplied were significantly higher than those in no plaque (control) and Mn plaque treatments, and much
higher than those supplied with arsenite. This showed that Fe plaque on the rice root had higher affinity to arsenate than
to arsenite. In Fe plaque treatment, the results indicated that most As was sequestered in roots when arsenite was supplied
and most As concentrated in Fe plaque when arsenate was supplied. Most As was accumulated in rice roots in Mn plaque and no
plaque treatments for both As species. |
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Keywords: | arsenate arsenite arsenic uptake and translocation iron plaque manganese plaque |
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