淹水和排水土壤中生长的水稻对铁的吸收来源和策略：来自 Fe 同位素分馏和基因表达的见解。
Source and Strategy of Iron Uptake by Rice Grown in Flooded and Drained Soils: Insights from Fe Isotope Fractionation and Gene Expression.
机构信息
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management, Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China.
SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China.
出版信息
J Agric Food Chem. 2022 Mar 2;70(8):2564-2573. doi: 10.1021/acs.jafc.1c08034. Epub 2022 Feb 17.
Rice can simultaneously absorb Fe via a strategy I-like system and Fe(III)-phytosiderophore via strategy II from soil. Still, it remains unclear which strategy and source of Fe dominate under distinct water conditions. An isotope signature combined with gene expression was employed to evaluate Fe uptake and transport in a soil-rice system under flooded and drained conditions. Rice of flooded treatment revealed a similar δFe value to that of soils (ΔFe = 0.05‰), while that of drained treatment was lighter than that of the soils (ΔFe = -0.41‰). Calculations indicated that 70.4% of Fe in rice was from Fe plaque under flooded conditions, while Fe was predominantly from soil solution under drained conditions. Up-regulated expression of , , and was observed in the root of flooded treatment, while higher expression of was observed in the drained treatment. These isotopic and genetic results suggested that the Fe(III)-DMA uptake from Fe plaque and Fe uptake from soil solution dominated under flooded and drained conditions, respectively.
水稻可以通过策略 I 型系统同时吸收 Fe 和通过策略 II 型从土壤中吸收 Fe(III)-植物络合素。然而，在不同的水分条件下，哪种策略和 Fe 来源占主导地位仍不清楚。本研究采用同位素示踪和基因表达相结合的方法，评估了淹水和排水条件下土壤-水稻系统中的 Fe 吸收和转运。淹水处理的水稻 δFe 值与土壤相似（ΔFe = 0.05‰），而排水处理的水稻 δFe 值比土壤轻（ΔFe = -0.41‰）。计算表明，淹水条件下水稻中 70.4%的 Fe 来自 Fe 斑，而排水条件下 Fe 主要来自土壤溶液。在淹水处理的根中观察到 、 和 的表达上调，而在排水处理中观察到 的表达更高。这些同位素和遗传结果表明，在淹水和排水条件下，分别由 Fe 斑上的 Fe(III)-DMA 吸收和土壤溶液中的 Fe 吸收占主导地位。
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