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Plant and Cell Physiology Advance Access originally published online on May 6, 2005
Plant and Cell Physiology 2005 46(7):1161-1164; doi:10.1093/pcp/pci117
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JSPP © 2005

Short Communication

Involvement of ARM2 in the Uptake of Indole-3-butyric Acid in Rice (Oryza sativa L.) Roots

Tory Chhun1, Shin Taketa2, Masahiko Ichii2 and Seiji Tsurumi1,*

1 Center for Supports to Research and Education Activities Isotope Division, Kobe University, Nada-ku, Kobe, 657-8501 Japan
2 Faculty of Agriculture, Kagawa University, Miki, Kagawa, 761-0795 Japan

* Corresponding author: E-mail, tsurumis{at}scitec.kobe-u.ac.jp; Fax, +81-78-803-5989.

Auxin influx carriers are involved in auxin transport and plant development. Here we show that the mutant of rice (Oryza sativa L. ssp. indica cv IR8) arm2 is defective in the uptake of the naturally occurring auxin indole-3-butyric acid (IBA). The acropetal and basipetal transport of IBA is reduced in arm2 roots compared with wild type. In contrast, arm2 roots are normal with respect to uptake and transport of indole-3-acetic acid (IAA). Furthermore, arm2 roots are resistant to IBA but respond normally to IAA. The mutant analysis of arm2 indicates the presence of an influx carrier system for IBA in rice roots.

(Received January 18, 2005; Accepted April 25, 2005)
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