Phosphatidylinositol 3-phosphate is required for abscisic acid-induced hydrogen peroxide production in rice leaves

被引:0
作者
Kuo Tung Hung
Ching Huei Kao
机构
[1] National Taiwan University,Department of Agronomy
来源
Plant Growth Regulation | 2005年 / 45卷
关键词
Abscisic acid; Hydrogen peroxide; NADPH oxidase; Phosphatidylinositol 3-kinas; Phosphatidylinositol 3-phosphate;
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摘要
Rice leaves produce H2O2 in response to abscisic acid (ABA), which results in induction of senescence and accumulation of NH4+. The upstream steps of the ABA-induced H2O2 production pathway in rice leaves remain largely unclear. In animal cells, H2O2 production in neutrophils is activated by phosphatidylinositol 3-phosphate (PI3P), a product of phosphatidylinositol 3-knase (PI3K). In the present study, we examined whether PI3P plays a role in H2O2 production in rice leaves exposed to ABA. We found that PI3K inhibitors LY 294002 (LY) or wortmannin (WM) inhibited ABA-induced H2O2 production, senescence and NH4+ accumulation. Hydrogen peroxide almost completely rescued the inhibitory effect of LY or WM. It appears that PI3P plays a role in ABA-induced H2O2 production, senescence, and NH4+ accumulation in rice leaves.
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页码:95 / 101
页数:6
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