Mixed heavy metals tolerance and radial oxygen loss in mangrove seedlings |
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| Authors: | Y. Liu N.F.Y. Tam J.X. Yang N. Pi M.H. Wong Z.H. Ye |
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| Affiliation: | aState Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen (Zhongshan) University, Guangzhou 510275, PR China;bDepartment of Biology and Chemistry, City University of Hong Kong, Hong Kong SAR, PR China;cFutian-CityU Mangrove Applied Research and Development Centre, Futian, Shenzhen 518040, PR China;dCroucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, PR China |
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| Abstract: | The effects of a mixture of heavy metals (Pb, Zn and Cu) on growth, radial oxygen loss (ROL) and the spatial pattern of ROL were investigated in mangrove seedlings of three species: Aegiceras corniculatum, Avicennia marina and Bruguiera gymnorrhiza. Heavy metals inhibited the growth of seedlings and led to decreased ROL and changes in the “tight” barrier spatial pattern of ROL. There was a significant positive correlation between the amount of ROL from the roots of seedlings and metal tolerance. The species with the highest ROL amount, B. gymnorrhiza, were also the most tolerant to heavy metals. The “tight” barrier spatial ROL pattern was also related to metal tolerance in the seedlings. Therefore, we conclude that both ROL amount and “tight” barrier spatial ROL pattern in the roots of the mangrove seedlings play an important role in resistance to heavy metal toxicity. |
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| Keywords: | Aegiceras corniculatum Avicennia marina Bruguiera gymnorrhiza Copper Lead Zinc |
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