Silicon-mediated mitigation of wounding stress acts by up-regulating the rice antioxidant system

Y.-H. Kim; A.L. Khan; M. Waqas; R. Shahzad; I.-J. Lee

doi:10.1556/0806.43.2015.031

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Cereal Research Communications

Volume/Issue:: Volume 44: Issue 1

Silicon-mediated mitigation of wounding stress acts by up-regulating the rice antioxidant system

Authors:

Y.-H. Kim

Y.-H. Kim Kyungpook National University, Daegu, 702-701, Korea
University of Misssouri, Columbia, MO 65211

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A.L. Khan

A.L. Khan Kyungpook National University, Daegu, 702-701, Korea
University of Nizwa, 616, Nizwa, Oman

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M. Waqas

M. Waqas Kyungpook National University, Daegu, 702-701, Korea
Department of Agriculture Extension, Buner, 19290, Pakistan

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R. Shahzad

R. Shahzad Kyungpook National University, Daegu, 702-701, Korea

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I.-J. Lee

I.-J. Lee Kyungpook National University, Daegu, 702-701, Korea

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Pages:: 111–121

Online Publication Date:: Mar 2016

Publication Date:: 01 Mar 2016

Article Category:: Research Article

DOI:: https://doi.org/10.1556/0806.43.2015.031

Keywords:: silicon; antioxidant enzymes; wounding stress; lipid peroxidation; Oryza sativa japonica ; time and dose dependent effect

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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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Cereal Research Communications A Quarterly of the Cereal Research Non-Profit Ltd. Company

Print ISSN:: 0133-3720

Online ISSN:: 1788-9170

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Cereal Research Communications
Language	English
Size	A4
Year of Foundation	1973
Volumes per Year	1
Issues per Year	4
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0133-3720 (Print)
ISSN	1788-9170 (Online)