Readily available phosphorous and nitrogen counteract for arsenic uptake and distribution in wheat (Triticum aestivum L.)

Elevated arsenic content in food crops pose a serious human health risk. Apart from rice wheat being another main food crop is possibly cultivated on contaminated sites. But for wheat uptake mechanisms are not entirely understood especially with regard to nutrient fertilization and different moistur...

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Bibliographic Details
Published in:Scientific reports 2014-05, Vol.4 (1), p.4944, Article 4944
Main Authors: Brackhage, Carsten, Huang, Jen-How, Schaller, Jörg, Elzinga, Evert J., Dudel, E. Gert
Format: Article
Language:English
Subjects:
101/58
631/449/2661/2665
692/700/478
704/172/169/896
Agricultural practices
Arsenic
Arsenic - metabolism
Climate change
Crops
Fertilization
Food
Health risks
Humanities and Social Sciences
multidisciplinary
Nitrogen - metabolism
Nutrients
Phosphorus - metabolism
Rainfall
Science
Soil - chemistry
Speciation
Tissue Distribution
Translocation
Triticum - metabolism
Triticum aestivum
Wheat
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Summary:Elevated arsenic content in food crops pose a serious human health risk. Apart from rice wheat being another main food crop is possibly cultivated on contaminated sites. But for wheat uptake mechanisms are not entirely understood especially with regard to nutrient fertilization and different moisture regimes taking into account heavy rainfall events due to climate change. Here we show that especially higher P-fertilization under changing redox conditions may enhance arsenic uptake. This counteracts with higher N-fertilization reducing arsenic transfer and translocation into aboveground plant parts for both higher P-fertilization and reducing soil conditions. Arsenic speciation did not change in grain but for leaves P-fertilization together with reducing conditions increased the As(V) content compared to other arsenic species. Our results indicate important dependencies of nutrient fertilization, moisture conditions and substrate type on As accumulation of wheat as one of the most important crop plants worldwide with implications for agricultural practices.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep04944