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Tracking Se Assimilation and Speciation through the Rice Plant – Nutrient Competition, toxicity and Distribution

Nothstein, Alexandra K.; Eiche, Elisabeth; Riemann, Michael; Nick, Peter; Winkel, Lenny H. E.; Göttlicher, Jörg; Steininger, Ralph; Brendel, Rita; Brasch, Matthias von; Konrad, Gabrilee; Neumann, Thomas

Abstract: Up to 1 billion people are affected by low intakes of the essential nutrient selenium (Se) due to low concentrations in crops. Biofortification of this micronutrient in plants is an attractive way of increasing dietary Se levels. We investigated a promising method of Se biofortification of rice seedlings, as rice is the primary staple for 3 billion people, but naturally contains low Se concentrations. We studied hydroponic Se uptake for 0–2500 ppb Se, potential phyto-toxicological effects of Se and the speciation of Se along the shoots and roots as a function of added Se species, concentrations and other nutrients supplied. We found that rice germinating directly in a Se environment increased plant-Se by factor 2–16, but that nutrient supplementation is required to prevent phyto-toxicity. XANES data showed that selenite uptake mainly resulted in the accumulation of organic Se in roots, but that selenate uptake resulted in accumulation of selenate in the higher part of the shoot, which is an essential requirement for Se to be transported to the grain. The amount of organic Se in the plant was positively correlated with applied Se concentration. Our results indicate that biofortification of seedlings with selenate is a successful method to increase Se levels in rice.

Zugehörige Institution(en) am KIT ANKA - die Synchrotronstrahlungsquelle am KIT (ANKA)
Botanisches Institut und Botanischer Garten (BOTANIK)
Institut für Angewandte Geowissenschaften (AGW)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1371/journal.pone.0152081
ISSN: 1932-6203
URN: urn:nbn:de:swb:90-541797
KITopen ID: 1000054179
HGF-Programm 56.98.01; LK 01
Erschienen in PLoS ONE
Band 11
Heft 4
Seiten e0152081
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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