Journal Article

ABA Controls H<sub>2</sub>O<sub>2</sub> Accumulation Through the Induction of <i>OsCATB</i> in Rice Leaves Under Water Stress

Nenghui Ye, Guohui Zhu, Yinggao Liu, Yingxuan Li and Jianhua Zhang

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 52, issue 4, pages 689-698
Published in print April 2011 | ISSN: 0032-0781
Published online March 2011 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcr028
ABA Controls H2O2 Accumulation Through the Induction of OsCATB in Rice Leaves Under Water Stress

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The production of both ABA and H2O2 is induced by drought and can act as signals under stress conditions. We investigated the relationships between ABA, H2O2 and catalase (CAT) in rice leaves when rice seedlings were treated with polyethylene glycol as water stress treatment. As a key gene in ABA biosynthesis, OsNCED3 was significantly induced in rice by water stress treatment and such induction preceded the rapid increase in ABA. Water stress inhibited the expression of CATA and CATC but substantially enhanced the expression of CATB. Exogenously applied ABA promoted the expression of CATB also and inhibited the expression of CATC in a concentration-dependent manner. When ABA production was inhibited by using ABA biosynthesis inhibitors nordihydroguaiaretic acid and tungstate, expression of CATB was also subdued while CATC was enhanced under the water stress. Accumulation of H2O2 was also reduced when endogenous ABA production was inhibited and showed a correlation with the total activity of catalases. Our results suggest that water stress-induced ABA prevents the excessive accumulation of H2O2, through the induction of the expression of CATB gene during water stress.

Keywords: ABA; Catalases; Hydrogen peroxide; Reactive oxygen species; Rice (Oryza sativa); Water stress

Journal Article.  5144 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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