Accumulation of cobalt and nickel in tissues of Clethra barbinervis in a metal dosing trial
Accumulation of cobalt and nickel in tissues of Clethra barbinervis in a metal dosing trial
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DOI：
10.1007/s11104-017-3455-y
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发表时间：
2017-10
期刊：
影响因子：
4.9
通讯作者：
Tsuyoshi Yamaguchi;Rie Tomioka;C. Takenaka
中科院分区：
文献类型：
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作者：
Tsuyoshi Yamaguchi;Rie Tomioka;C. Takenaka
目的本研究从与Ni类比的角度揭示了Co的积累特性以及Co积累树Clethra barbinervis中其他必需微量元素的变化。 barbinervis 在含有 Co、Ni 或三种不同浓度（5、50 和 500 μM）的根际中进行单一和混合处理。测定了根、茎和叶中的 Cu、Fe、Mn、Zn 以及 Co 和 Ni 的浓度。结果用 500 μM Ni 处理的植物生物量减少，但用 Co 处理则没有减少。叶子中的 Co 浓度高于其他组织，叶子中 Co 累积量最大为 2012 μg g−1。 Co的积累与Zn的运输竞争并刺激Cu的运输。结论我们的结果表明C。 barbinervis 是一种 Co 超富集植物，对 Co 的耐受性比对 Ni 的耐受性更高。 Co超富集能力可能是通过涉及根到地上部易位的Zn运输系统实现的，并且Co积累与其他重金属具有一些竞争性和促进性相互作用。
AimsThis study reveals the accumulation properties of Co from viewpoints of the analogy with Ni and also the variation of the other essential micro elements in the Co accumulator tree,Clethra barbinervis.MethodsSeedlings ofC. barbinerviswere grown in single and mixed treatments in the rhizosphere containing Co, Ni, or both at three different concentrations (5, 50, and 500 μM). In roots, stems, and leaves, the concentrations of Cu, Fe, Mn, and Zn, together with Co and Ni, were determined.ResultsBiomass was reduced in plants treated with 500 μM Ni, but not when treated with Co. The Co concentration in leaves was higher than those in other tissues, and the maximum Co accumulation in leaves was 2012 μg g−1. Accumulation of Co competed with Zn transport and stimulated Cu transport.ConclusionOur results indicate thatC. barbinervisis a Co hyperaccumulator and is more tolerant to Co than to Ni. The Co hyperaccumulation capacity is likely achieved by Zn transport systems involved in root to shoot translocation, and Co accumulation has some competitive and facilitative interactions with the other heavy metals.