Combined toxicity of cadmium and copper in Avicennia marina seedlings and the regulation of exogenous jasmonic acid

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)124-132
Journal / PublicationEcotoxicology and Environmental Safety
Volume113
Online published8 Dec 2014
Publication statusPublished - Mar 2015

Abstract

Seedlings of Avicennia marina were exposed to single and combined metal treatments of cadmium (Cd) and copper (Cu) in a factorial design, and the combined toxicity of Cu and Cd was tested. The effects of the exogenous jasmonic acid (JA) on chlorophyll concentration, lipid peroxidation, Cd and Cu uptake, antioxidative capacity, endogenous JA concentration, and type-2 metallothionein gene (AmMT2) expression in seedlings of A. marina exposed to combined metal treatments were also investigated. A binary mixture of low-dose Cd (9μmolL-1) and high-dose Cu (900μmolL-1) showed toxicity to the seedlings, indicated by the significant augmentation in leaf malondialdehyde (MDA) and reduction in leaf chlorophylls. The toxicity of the combined metals was significantly alleviated by the addition of exogenous JA at 1μmolL-1, and the chlorophyll and MDA contents were found to be restored to levels comparable to those of the control. Compare to treatment with Cd and Cu only, 1 and 10μmolL-1 JA significantly enhanced the ascorbate peroxidase activity, and 10μmolL-1 JA significantly decreased the uptake of Cd in A. marina leaves. The relative expression of leaf AmMT2 gene was also significantly enhanced by 1 and 10μmolL-1 JA, which helped reduce Cd toxicity in A. marina seedlings.

Research Area(s)

  • Combined metals, Jasmonic acid, Mangrove, Metallothioneins, Stress

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