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
作者: Cheng, H. 1 ; Liu, Y. 3 ; Tam, N. F. Y. 4 ; Wang, X. 1 ; Li, S. Y. 5 ; Chen, G. Z. 5 ; Ye, Z. H. 1 ;
作者机构: 1.Sun Yat Sen Univ, State Key Lab Biocontrol, Guangzhou 510006, Guangdong, Peoples R China
2.Sun Yat Sen Univ, Sch Life Sci, Guangzhou 510006, Guangdong, Peoples R China
3.Chinese Acad Fishery Sci, Minist Agr, Key Lab Mariculture Ecol & Prod Qual & Safety, S China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China
4.City Univ Hong Kong, Dept Biol & Chem, Hong Kong, Hong Kong, Peoples R China
5.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China
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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