Accumulation and physiological response of cadmium in Hydrocharis dubia

Haiyan Yang; Wenlong Wu; Weilin Li; Guoxin Shi

doi:10.1515/biolog-2017-0013

Article

Accumulation and physiological response of cadmium in Hydrocharis dubia

Haiyan Yang , Wenlong Wu , Weilin Li and Guoxin Shi

Published/Copyright: February 28, 2017

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From the journal Biologia Volume 72 Issue 2

Abstract

The effects of increasing concentrations of cadmium (Cd) on the ultrastructure, Cd accumulation, nutrient elements contents, levels of chlorophyll pigments, hydrogen peroxide (H₂O₂), malondialdehyde (MDA), antioxidants, as well as the activities of antioxidant enzymes were investigated in the leaves of Hydrocharis dubia (Bl.) Backer. Cd exposure resulted in significant damage in chloroplasts and mitochondria, suggesting that Cd hastened the senescence of the tested plants. The accumulation of Cd was found to increase in a concentration dependent manner with a maximum of 1088 μg g⁻¹ at 80 μM. The levels of Ca, P and Cu declined and the levels of Mg increased under all Cd concentrations, but K and Fe contents increased initially and decreased thereafter. Pigment content decreased with the rise of the Cd concentrations. H₂O₂ content enhanced gradually at all Cd concentrations. MDA content increased progressively up to 60 μM Cd, followed by a decline at higher concentration. The effect of Cd application on ascorbate (AsA) and reduced glutathione (GSH) contents was similar to that seen for H₂O₂ content. Peroxidase (POD) and catalase (CAT) activities first increased and then decreased, while superoxide dismutase (SOD) activity markedly decreased. Results suggest that Cd-induced oxidative damage in H. dubia is closely associated with the efficiency of its intrinsic antioxidant mechanisms, both the disorder of nutrient elements and the damage to the ultrastructure were indicative of general disarray in the cellular functions exerted by Cd.

Key words: Hydrocharis dubia; antioxidant system; cadmium; nutrient elements; ultrastructure

Acknowledgements

The research was supported in part by the grant from Jiangsu Agricultural Science and Technology Innovation Fund Project (No.CX(16)1035).

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Received: 2016-5-18

Accepted: 2016-11-29

Published Online: 2017-2-28

Published in Print: 2017-2-1

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Articles in the same Issue

https://doi.org/10.1515/biolog-2017-0013

Keywords for this article

Hydrocharis dubia; antioxidant system; cadmium; nutrient elements; ultrastructure