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Plant and Cell Physiology Advance Access published online on May 31, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci140
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received November 19, 2004
Accepted May 23, 2005

Regular Paper

AtGLB1 Enhances the Tolerance of Arabidopsis to Hydrogen Peroxide Stress

Li-Xiang Yang 1, Rui-Yong Wang 1, Feng Ren 1, Jia Liu 1, Jia Cheng 1, and Ying-Tang Lu 1*

1 Key Lab of MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China

* To whom correspondence should be addressed.
Ying-Tang Lu, E-mail: yingtlu{at}whu.edu.cn


  Abstract

Hydrogen peroxide (H2O2) as a widespread molecule plays an important role in plant stress responses. Here, we showed that Arabidopsis line over-expressing hemoglobin 1 (AtGLB1) can enhance its tolerance to severe hypoxia stress. In our research, Arabidopsis lines with different hemoglobin levels were employed to study the relationship between H2O2 level and the tolerance to hypoxic stress. The relatively low endogenous H2O2 level of AtGLB1-over-expressing plants could be one of the main factors for the increased tolerance of plants to hypoxic stress. Further investigation indicated that the activity of antioxidant system involved in scavenging H2O2 increased in all three lines examined during hypoxic treatment, while only the line over-expressing AtGLB1 could retain these relative high levels up to 48 h of the treatment, suggesting that antioxidant system might play a role for the low H2O2 level of Arabidopsis over-expressing AtGLB1.

Keywords: Arabidopsis; Hemoglobin 1; Hydrogen peroxide stress.
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