期刊
CEREAL RESEARCH COMMUNICATIONS
卷 44, 期 1, 页码 111-121出版社
SPRINGER HEIDELBERG
DOI: 10.1556/0806.43.2015.031
关键词
silicon; antioxidant enzymes; wounding stress; lipid peroxidation; Oryza sativa japonica; time and dose dependent effect
类别
资金
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [2014R1A1A2A10058022]
Silicon (Si) is essential for normal growth and development in plants and is also beneficial for their responses to wounding. However, the mechanisms by which Si acts to mitigate the effects of wounding is not fully understood. This effect possibly occurs through a reduction in the oxidative stresses associated with wounding. Here, we tested this possibility by investigating the effects of applying different concentrations of Si (0,5 and 1,0 mM) to rice plants under wounding stress for a period of 6 and 12 h. We found that a higher uptake of Si was signifiacntly associated with an increase in leaf chlorophyll contet. In response to wounding induced oxidative stress, the extent of lipid bilayer peroxidation was reduced in a dose-dependent manner by Si application for 6 or 12 h. Activity of the catalase enzyme was initially lowered by Si treatment; however, at 1.0 mM Si, catalase activity increased significantly after 12h of wounding stress. A similar response was also observed for a peroxidase enzyme. Polyphenol oxidase showed a significant reduction in activity. We conclude that Si application does not only improve leaf chlorophyll content but can also overcome the oxidative stress due wounds or physical injuries.
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