Journal
PLANT AND SOIL
Volume 372, Issue 1-2, Pages 629-641Publisher
SPRINGER
DOI: 10.1007/s11104-013-1773-2
Keywords
Accumulation; Modeling; Plant; Selenium; Speciation; Sulphur
Categories
Funding
- University of Guelph
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Metals in the Human Environment Strategic Network (MITHE-SN)
- Redeemer University College
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A comparison was performed between plant species to determine if extractable, rather than total soil Se, is more effective at predicting plant Se accumulation over a full growing season. Durum wheat (Triticum turgidum L.) and spring canola (Brassica napus L.) were sown in potted soil amended with 0, 0.1, 1.0, or 5.0 mg kg(-1) Se as SeO4 (2-) or SeO3 (2-). In addition, SeO4 (2-)-amended soils were amended with 0 or 50 mg kg(-1) S as SO4 (2-). Soils were analyzed for extractable and total concentration of Se ([Se]). Twice during the growing season plants were harvested and tissue [Se] was determined. Plants exposed to SeO3 (2-) accumulated the least Se. Fitted predictive models for whole plant accumulation based on extractable soil [Se] were similar to models based on total [Se] in soil (R-2 = 0.73 or 0.74, respectively) and selenium speciation and soil [S] were important soil parameters to consider. As well, soil S amendments limited Se toxicity. Soil quality guidelines (SQGs) based on extractable Se should be considered for risk assessment, particularly when Se speciation is unknown. Predictive models to estimate plant Se uptake should include soil S, a modifier of Se accumulation.
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