Journal
BIOLOGICAL TRACE ELEMENT RESEARCH
Volume 161, Issue 1, Pages 130-135Publisher
HUMANA PRESS INC
DOI: 10.1007/s12011-014-0079-4
Keywords
Rare earth elements; Peroxidase; Horseradish; Growth stage
Funding
- National Natural Science Foundation of China [31170477]
- National Natural Science Foundation of Jiangsu Province [BK2011160]
- Research and Innovation Project for Postgraduates of Higher Education Institutions of Jiangsu Province [CXZZ12_0760]
- Fundamental Research Funds for the Central Universities [JUDCF12024]
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The pollution of the environment by rare earth elements (REEs) causes deleterious effects on plants. Peroxidase plays important roles in plant response to various environmental stresses. Here, to further understand the overall roles of peroxidase in response to REE stress, the effects of the REE terbium ion (Tb3+) on the peroxidase activity and H2O2 and lignin contents in the leaves and roots of horseradish during different growth stages were simultaneously investigated. The results showed that after 24 and 48 h of Tb3+ treatment, the peroxidase activity in horseradish leaves decreased, while the H2O2 and lignin contents increased. After a long-term (8 and 16 days) treatment with Tb3+, these effects were also observed in the roots. The analysis of the changes in peroxidase activity and H2O2 and lignin contents revealed that peroxidase plays important roles in not only reactive oxygen species scavenging but also cell wall lignification in horseradish under Tb3+ stress. These roles were closely related to the dose of Tb3+, duration of stress, and growth stages of horseradish.
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