Changes of Cadmium Storage Forms and Isotope Ratios in Rice During Grain Filling
| العنوان: | Changes of Cadmium Storage Forms and Isotope Ratios in Rice During Grain Filling |
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| المؤلفون: | Wiggenhauser, Matthias, Aucour, Anne-Marie, Telouk, Philippe, Blommaert, Hester, Sarret, Géraldine |
| المساهمون: | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) |
| المصدر: | Frontiers in Plant Science Frontiers in Plant Science, Frontiers, 2021, 12, ⟨10.3389/fpls.2021.645150⟩ Frontiers in Plant Science, 2021, 12, ⟨10.3389/fpls.2021.645150⟩ Frontiers in Plant Science, 12 |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | cadmium, rice, soil, stable isotope fractionation, X-ray absorption spectroscopy, speciation, remobilization and storage, [SDV.BV.AP]Life Sciences [q-bio]/Vegetal Biology/Plant breeding, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy, Plant Science, Original Research |
| الوصف: | International audience; 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 114/110 Cd maturity–flowering = 0.14 ± 0.04‰). These results are consistent with a sequestration of Cd in root vacuoles that includes strong binding of Cd to thiol containing ligands that favor light isotopes, with a small fraction of Cd strongly enriched in heavy isotopes being transferred to shoots during grain filling. The Cd speciation in the shoots changed from predominantly Cd–S (72%) to Cd bound to O ligands (Cd–O, 80%) during grain filling. Cd–O may represent Cd binding to organic acids in vacuoles and/or binding to cell walls in the apoplast. Despite this change of ligands, which was attributed to plant senescence, Cd was largely immobile in the shoots since only 0.77% of Cd in the shoots were transferred into the grains. Thus, both storage forms (Cd–S and Cd–O) contributed to the retention of Cd in the straw. Cd was mainly bound to S in nodes I and grains (Cd–S > 84%), and these organs were strongly enriched in heavy isotopes compared to straw (Δ 114/110 Cd grains/nodes– straw = 0.66–0.72‰) and flag leaves (Δ 114/110 Cd grains/nodes–flag leaves = 0.49–0.52‰). Hence, xylem to phloem transfer in the node favors heavy isotopes, and the Cd–S form may persist during the transfer of Cd from node to grain. This study highlights the importance of Cd storage forms during its journey to grain and potentially into the food chain. |
| وصف الملف: | application/application/pdf |
| تدمد: | 1664-462X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=pmid_dedup__::e26d6e41954bd09741eb5caae3bdcfe4Test https://pubmed.ncbi.nlm.nih.gov/33995443Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.pmid.dedup....e26d6e41954bd09741eb5caae3bdcfe4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1664462X |
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