Comprehensive Functional Analysis of the Catalase Gene Family in Arabidopsis thaliana

In Arabidopsis, catalase (CAT) genes encode a small family of proteins including CAT1, CAT2 and CAT3, which catalyze the decomposition of hydrogen peroxide (H₂O₂) and play an important role in controlling homeostasis of reactive oxygen species (ROS). Here, we analyze the expression profiles and acti...

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Bibliographic Details
Published in:Journal of integrative plant biology 2008-10, Vol.50 (10), p.1318-1326
Main Authors: Du, Yan-Yan, Wang, Peng-Cheng, Chen, Jia, Song, Chun-Peng
Format: Article
Language:English
Subjects:
Abscisic Acid - pharmacology
Arabidopsis - drug effects
Arabidopsis - enzymology
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
catalase
Catalase - genetics
Catalase - metabolism
Gene Expression Regulation, Enzymologic - drug effects
Gene Expression Regulation, Enzymologic - physiology
Gene Expression Regulation, Plant - drug effects
Gene Expression Regulation, Plant - physiology
Hydrogen Peroxide - metabolism
Isoenzymes - genetics
Isoenzymes - metabolism
isozymes
Oxidative Stress
reactive oxygen species
Salicylic Acid - pharmacology
stress
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Summary:In Arabidopsis, catalase (CAT) genes encode a small family of proteins including CAT1, CAT2 and CAT3, which catalyze the decomposition of hydrogen peroxide (H₂O₂) and play an important role in controlling homeostasis of reactive oxygen species (ROS). Here, we analyze the expression profiles and activities of three catalases under different treatments including drought, cold, oxidative stresses, abscisic acid and salicylic acid in Arabidopsis. Our results reveal that CAT1 is an important player in the removal of H₂O₂ generated under various environmental stresses. CAT2 and CAT3 are major H₂O₂ scavengers that contribute to ROS homeostasis in light or darkness, respectively. In addition, CAT2 is activated by cold and drought stresses and CAT3 is mainly enhanced by abscisic acid and oxidative treatments as well as at the senescence stage. These results, together with previous data, suggest that the network of transcriptional control explains how CATs and other scavenger enzymes such as peroxidase and superoxide dismutase may be coordinately regulated during development, but differentially expressed in response to different stresses for controlling ROS homeostasis.
ISSN:1672-9072
1744-7909
DOI:10.1111/j.1744-7909.2008.00741.x