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Cadmium stress alters the redox reaction and hormone balance in oilseed rape (Brassica napus L.) leaves

Yan, Hui and Filardo, Fiona and Hu, Xiaotao and Zhao, Xiaomin and Fu, DongHui (2015) Cadmium stress alters the redox reaction and hormone balance in oilseed rape (Brassica napus L.) leaves. Environmental Science and Pollution Research . pp. 1-12. ISSN 0944-1344

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Article Link(s): http://dx.doi.org/10.1007/s11356-015-5640-y

Abstract

In order to understand the physiological response of oilseed rape (Brassica napus L.) leaves to cadmium (Cd) stress and exploit the physiological mechanisms involved in Cd tolerance, macro-mineral and chlorophyll concentrations, reactive oxygen species (ROS) accumulation, activities of enzymatic antioxidants, nonenzymatic compounds metabolism, endogenous hormonal changes, and balance in leaves of oilseed rape exposed to 0, 100, or 200 μM CdSO4 were investigated. The results showed that under Cd exposure, Cd concentrations in the leaves continually increased while macro-minerals and chlorophyll concentrations decreased significantly. Meanwhile, with increased Cd stress, superoxide anion (O 2 • − ) production rate and hydrogen peroxide (H2O2) concentrations in the leaves increased significantly, which caused malondialdehyde (MDA) accumulation and oxidative stress. For scavenging excess accumulated ROS and alleviating oxidative injury in the leaves, the activity of enzymatic antioxidants, such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), was increased significantly at certain stress levels. However, with increased Cd stress, the antioxidant enzyme activities all showed a trend towards reduction. The nonenzymatic antioxidative compounds, such as proline and total soluble sugars, accumulated continuously with increased Cd stress to play a long-term role in scavenging ROS. In addition, ABA levels also increased continuously with Cd stress while ZR decreased and the ABA/ZR ratio increased, which might also be providing a protective role against Cd toxicity.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Cadmium stress Brassica napus L Tolerance ROS Enzymatic and nonenzymatic antioxidants Endogenous hormones
Subjects:Science > Botany > Plant physiology
Plant culture > Field crops > Textile and fibre plants
Deposited On:02 Feb 2016 04:03
Last Modified:02 Feb 2016 04:03

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