The role of radial oxygen loss and root anatomy on zinc uptake and tolerance in mangrove seedlings

文献类型： 外文期刊

第一作者： Cheng, H.

作者： Cheng, H.;Wang, X.;Ye, Z. H.;Cheng, H.;Wang, X.;Ye, Z. H.;Liu, Y.;Tam, N. F. Y.;Li, S. Y.;Chen, G. Z.

作者机构：

关键词： radial oxygen loss;root anatomy;SEM X-ray microanalysis;heavy metals;mangrove plants

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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收录情况： SCI

摘要： Root anatomy, radial oxygen loss (ROL) and zinc (Zn) uptake and tolerance in mangrove plants were investigated using seedlings of Aegiceras comiculatum, Bruguiera gymnorrhiza and Rhizophora stylosa. The results revealed that B. gymnorrhiza, which possessed the 'tightest barrier' in ROL spatial patterns among the three species studied, took up the least Zn and showed the highest Zn tolerance. Furthermore, zinc significantly decreased the ROL of all three plants by inhibition of root permeability, which included an obvious thickening of outer cortex and significant increases of lignification in cell walls. The results of SEM X-ray microanalysis further confirmed that such an inducible, low permeability of roots was likely an adaptive strategy to metal stress by direct prevention of excessive Zn entering into the root. The present study proposes new evidence of structural adaptive strategy on metal tolerance by mangrove seedlings.

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