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Open AccessArticle

Silicon-Mediated Enhancement of Heavy Metal Tolerance in Rice at Different Growth Stages

1
Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
2
Key Laboratory of Tropical Agro-Environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(10), 2193; https://doi.org/10.3390/ijerph15102193
Received: 6 September 2018 / Revised: 30 September 2018 / Accepted: 2 October 2018 / Published: 8 October 2018
(This article belongs to the Special Issue Remediation and Analysis of Soil, Air, and Water Pollution)
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Abstract

Silicon (Si) plays important roles in alleviating heavy metal stress in rice plants. Here we investigated the physiological response of rice at different growth stages under the silicon-induced mitigation of cadmium (Cd) and zinc (Zn) toxicity. Si treatment increased the dry weight of shoots and roots and reduced the Cd and Zn concentrations in roots, stems, leaves and grains. Under the stress of exposure to Cd and Zn, photosynthetic parameters including the chlorophyll content and chlorophyll fluorescence decreased, while the membrane permeability and malondialdehyde (MDA) increased. Catalase (CAT) and peroxidase (POD) activities increased under heavy metals stress, but superoxide dismutase (SOD) activities decreased. The magnitude of these Cd- and Zn-induced changes was mitigated by Si-addition at different growth stages. The available Cd concentration increased in the soil but significantly decreased in the shoots, which suggested that Si treatment prevents Cd accumulation through internal mechanisms by limiting Cd2+ uptake by the roots. Overall, the phenomena of Si-mediated alleviation of Cd and excess Zn toxicity in two rice cultivars could be due to the limitation of metal uptake and transport, resulting in an improvement in cell membrane integrity, photosynthetic performance and anti-oxidative enzyme activities after Si treatment. View Full-Text
Keywords: phytotoxicity; heavy metal toxicity; physiological response; systemic uptake phytotoxicity; heavy metal toxicity; physiological response; systemic uptake
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Huang, F.; Wen, X.-H.; Cai, Y.-X.; Cai, K.-Z. Silicon-Mediated Enhancement of Heavy Metal Tolerance in Rice at Different Growth Stages. Int. J. Environ. Res. Public Health 2018, 15, 2193.

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