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Foliar uptake of radiocaesium from irrigation water by paddy rice ( Oryza sativa ): an overlooked pathway in contaminated environments
Author(s) -
Uematsu Shinichiro,
Vandenhove Hildegarde,
Sweeck Lieve,
Hees May Van,
Wannijn Jean,
Smolders Erik
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14416
Subject(s) - oryza sativa , irrigation , agronomy , potassium , rice plant , chemistry , contamination , shoot , base (topology) , paddy field , chromosomal translocation , horticulture , biology , biochemistry , ecology , mathematical analysis , mathematics , organic chemistry , gene
Summary Flooded (paddy) rice ( Oryza sativa ) can take up ions from the irrigation water by foliar uptake via the exposed stem base. We hypothesised that the stem base uptake of radiocaesium (RCs) is a pathway for rice grown in RCs‐contaminated environments. We developed a bi‐compartmental device which discriminates the stem base from root RCs uptake from solutions, thereby using RCs isotopes ( 137 Cs and 134 Cs) with < 2% solution leak between the compartments. Radiocaesium uptake was linear over time (0–24 h). Radiocaesium uptake to the entire plant, expressed per dry weight of the exposed parts, was sixfold higher for the roots than for the exposed stem base. At equal RCs concentrations in both compartments, the exposed stem base and root uptake contributed almost equally to the total shoot RCs concentrations. Reducing potassium supply to the roots not only increased the root RCs uptake but also increased RCs uptake by the stem base. This study was the first to experimentally demonstrate active and internally regulated RCs uptake by the stem base of rice. Scenario calculations for the Fukushima‐affected area predict that RCs in irrigation water could be an important source of RCs in rice as indirectly suggested from field data.

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