Genotypic variations in the dynamics of metal concentrations in poplar leaves: a field study with a perspective on phytoremediation.
Genotypic variations in the dynamics of metal concentrations in poplar leaves: a field study with a perspective on phytoremediation.
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DOI：
10.1016/j.envpol.2015.01.010
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发表时间：
2015-04
影响因子：
8.9
通讯作者：
Mathieu Pottier;Vanesa S. Garcia de la Torre;C. Victor;L. David;M. Chalot;S. Thomine
中科院分区：
文献类型：
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作者：
Mathieu Pottier;Vanesa S. Garcia de la Torre;C. Victor;L. David;M. Chalot;S. Thomine
杨树常用于金属污染土壤的植物修复。为了探讨叶片金属含量的调控机制，对生长在污染地块上的不同类型杨树叶片在不同发育阶段的金属离子浓度及其相关基因的表达水平进行了监测，发现不同类型杨树叶片金属离子浓度存在较大差异。而镁在衰老过程中被重新动员，锌和镉的积累一直持续到叶片脱落。天然抗性相关巨噬细胞蛋白1(NRAMP1)的表达水平与锌生物浓缩因子呈正相关。金属浓度和基因表达水平的主成分分析明显区分了杨树的基因类型。这项研究强调，尽管在控制叶片金属动态平衡方面，杨树叶片中的微量元素普遍缺乏可移动性。
Poplar is commonly used for phytoremediation of metal polluted soils. However, the high concentrations of trace elements present in leaves may return to soil upon leaf abscission.To investigate the mechanisms controlling leaf metal content, metal concentrations and expression levels of genes involved in metal transport were monitored at different developmental stages on leaves from different poplar genotypes growing on a contaminated field.Large differences in leaf metal concentrations were observed among genotypes. Whereas Mg was remobilized during senescence, Zn and Cd accumulation continued until leaf abscission in all genotypes. A positive correlation between Natural Resistance Associated Macrophage Protein 1 (NRAMP1) expression levels and Zn bio-concentration factors was observed. Principal component analyses of metal concentrations and gene expression levels clearly discriminated poplar genotypes.This study highlights a general absence of trace element remobilization from poplar leaves despite genotype specificities in the control of leaf metal homeostasis.