Abstract：
:The effects of exogenous silicon (Si) on plant growth, activities of superoxide dismutase (SOD), guaiacol peroxidase (GPX), ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR), glutathione reductase (GR) and catalase, and concentrations of ascorbate and glutathione were investigated in cucumber (Cucumis sativus L.) plants treated with excess manganese (Mn) (600 microM). Compared with the treatment of normal Mn (10 microM), excess Mn significantly increased H2O2 concentration and lipid peroxidation indicated by accumulation of thiobarbituric acid reactive substances. The leaves showed apparent symptoms of Mn toxicity and the plant growth was significantly inhibited by excess Mn. The addition of Si significantly decreased lipid peroxidation caused by excess Mn, inhibited the appearance of Mn toxicity symptoms, and improved plant growth. This alleviation of Mn toxicity by Si was related to a significant increase in the activities of SOD, APX, DHAR and GR and the concentrations of ascorbate and glutathione.
journal_name
Phytochemistryjournal_title
Phytochemistryauthors
Shi Q,Bao Z,Zhu Z,He Y,Qian Q,Yu Jdoi
10.1016/j.phytochem.2005.05.006subject
Has Abstractpub_date
2005-07-01 00:00:00pages
1551-9issue
13eissn
0031-9422issn
1873-3700pii
S0031-9422(05)00223-2journal_volume
66pub_type
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