title: Roles of horseradish peroxidase in response to terbium stress.
abstract: 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 (Tb(3+)) 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 Tb(3+) 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 Tb(3+), 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 Tb(3+) stress. These roles were closely related to the dose of Tb(3+), duration of stress, and growth stages of horseradish.
authors: State Key Laboratory of Food Science and Technology, Environmental and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
authors: Xuanbo
authors: X
authors: Zhang
authors: Lihong
authors: L
authors: Wang
authors: Qing
authors: Q
authors: Zhou
mesh_terms: D031215:Armoracia / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006735:Horseradish Peroxidase / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000378:metabolism; D008031:Lignin / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D013312:Stress, Physiological; D013725:Terbium / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D010940:Plant Proteins; D013725:Terbium; D008031:Lignin; D006861:Hydrogen Peroxide; D006735:Horseradish Peroxidase