Celosia argentea (Amaranthaceae) can accumulate both Cd and Mn. This study reveals the interactive effect and underlying mechanism of Cd and Mn during their uptake in this species. Plants were grown in hydroponic and soil media with different Cd and Mn treatments. The concentrations of Cd and Mn in plants and soil solutions were determined by ICP-MS. The real-time Cd2+ flux values into roots were measured with non-invasive micro-test technology. Manganese supply significantly decreased Cd bioaccumulation in C. argentea in hydroponic experiments. The mean net Cd2+ flux rates into roots decreased by 10.5% and 56.9% with the addition of 0.01 and 0.5 mM Mn2+, respectively. The Mn supply (1 mM) increased the Michaelis constant by 1.8-fold but did not significantly change the maximum uptake velocity of Cd. In soil culture experiments, Mn application significantly increased Cd bioaccumulation and Cd concentrations in soil solutions. The interactions of Cd and Mn in C. argentea differ between hydroponic and soil cultures. Mn inhibits Cd uptake in hydroponic experiments via competition in common transport systems. The enhancement effect of Mn on Cd uptake in soil systems is attributed to an increase of Cd in soil solutions by competitive adsorption.

中文翻译：

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水培系统和土壤系统之间的 Mn 和 Cd 在 Celosia argentea 吸收过程中的相互作用不同

Celosia argentea (Amaranthaceae) 可以积累 Cd 和 Mn。本研究揭示了 Cd 和 Mn 在该物种吸收过程中的相互作用和潜在机制。植物在具有不同 Cd 和 Mn 处理的水培和土壤介质中生长。通过ICP-MS测定植物和土壤溶液中Cd和Mn的浓度。使用非侵入性微测试技术测量进入根部的实时 Cd2+ 通量值。在水培实验中，锰供应显着降低了 C. argentea 中 Cd 的生物积累。添加 0.01 和 0.5 mM Mn2+ 后，流入根部的平均净 Cd2+ 通量率分别降低了 10.5% 和 56.9%。Mn 供应 (1 mM) 将 Michaelis 常数增加了 1.8 倍，但没有显着改变 Cd 的最大吸收速度。在土培实验中，Mn 施用显着增加了土壤溶液中 Cd 的生物积累和 Cd 浓度。C. argentea 中 Cd 和 Mn 的相互作用在水培和土壤培养之间有所不同。Mn 通过在常见运输系统中的竞争抑制水培实验中 Cd 的吸收。Mn 对土壤系统中 Cd 吸收的增强作用归因于通过竞争吸附增加土壤溶液中的 Cd。