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Published on April 3, 2003; 10.1104/pp.102.016964

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Received November 4, 2002
Returned for revision November 26, 2002
Accepted January 23, 2003

A Role for Phosphatidylinositol 3-Phosphate in Abscisic Acid-Induced Reactive Oxygen Species Generation in Guard Cells

Ki-Youb Park , Ji-Yul Jung , Jumok Park , Jae-Ung Hwang , Yong-Woo Kim , Inhwan Hwang , and Youngsook Lee *

National Research Laboratory of Phytoremediation, Division of Molecular Life Sciences, POSTECH, Pohang, 790-784, Korea (K.-Y. P., J.-Y.J., J.P., J.-U.H, Y.L.); and Center for Plant Intracellular Trafficking, POSTECH, Pohang, 790-784, Korea (Y.-W.K., I.H.)

* Corresponding author; email: ylee{at}postech.ac.kr.

Guard cells generate reactive oxygen species (ROS) in response to abscisic acid (ABA), which leads to stomatal closing. The upstream steps of the ABA-induced ROS generation pathway remain largely unknown. In animal cells, ROS generation in neutrophils is activated by phosphatidylinositol 3-phosphate (PI3P). Stomatal guard cells contain PI3P and PI 3-kinase activity. In this study, we tested whether PI3P has a role in ROS generation in guard cells exposed to ABA. We found that PI 3-kinase inhibitors wortmannin or LY294002 inhibited ABA-induced ROS generation and stomatal closing. Endosome-binding domain (of human EEA1), which specifically binds to PI3P, also inhibited ABA-induced ROS generation and stomatal closing when overexpressed in guard cells. Hydrogen peroxide partially reversed the effects of wortmannin or LY294002 on ABA-induced stomatal closing. These results support a role for PI3P in ABA-induced ROS generation and stomatal closing movement.




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