Changes of Cadmium Storage Forms and Isotope Ratios in Rice During Grain Filling.

ABSTRACT: Rice poses a major source of the toxic contaminant cadmium (Cd) for humans. Here, we elucidated the role of Cd storage forms (i.e., the chemical Cd speciation) on the dynamics of Cd within rice. In a pot trial, we grew rice on a Cd-contaminated soil in upland conditions and sampled roots and shoots parts at flowering and maturity. Cd concentrations, isotope ratios, Cd speciation (X-ray absorption spectroscopy), and micronutrient concentrations were analyzed. During grain filling, Cd and preferentially light Cd isotopes were strongly retained in roots where the Cd storage form did not change (Cd bound to thiols, Cd-S = 100%). In the same period, no net change of Cd mass occurred in roots and shoots, and the shoots became enriched in heavy isotopes (Δ^114/110Cd _maturity-flo

SUBMITTER: Wiggenhauser M 

PROVIDER: S-EPMC8116553 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature