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- Title
Tolerance Mechanisms to Copper and Zinc Excess in Rhizophora mucronata Lam. Seedlings Involve Cell Wall Sequestration and Limited Translocation.
- Authors
Torasa, Supakson; Boonyarat, Pimpakan; Phongdara, Amornrat; Buapet, Pimchanok
- Abstract
Rhizophora mucronata is a common mangrove growing in habitats subjected to heavy metal (HM) contamination. Understanding their physiological responses to copper (Cu) and zinc (Zn) excess and underlying tolerance mechanisms is crucial to assess impacts of metal pollution on mangrove community. Seedlings were treated with Cu or Zn (0, 50 or 100 mg per plant) by means of a single addition. At day 3 and 7, Cu and Zn accumulation, photosynthetic efficiency, superoxide dismutase and peroxidase activity, non-protein thiols, reactive oxygen species and lipid peroxidation in roots and leaves were measured. R. mucronata restricted Cu and Zn translocation, thus accumulated HM mainly in roots while kept the leaves unaffected. However, high root HM did not induce oxidative stress nor anti-oxidative defense as HM were largely deposited in cell wall. We concluded that HM tolerance strategies of R. mucronata seedlings are exclusion and restriction of translocation to the vital photosynthetic tissue.
- Subjects
RHIZOPHORA mucronata; MANGROVE plants; COPPER content of plants; ZINC content of plants; PLANT cell walls; PLANT physiology; PHYTOTOXICITY
- Publication
Bulletin of Environmental Contamination & Toxicology, 2019, Vol 102, Issue 4, p573
- ISSN
0007-4861
- Publication type
Article
- DOI
10.1007/s00128-019-02589-y