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Plant and Cell Physiology Advance Access published online on May 6, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci117
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 18, 2005
Accepted April 25, 2005

Short Communication

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

Tory Chhun 1, Shin Taketa 2, Masahiko Ichii 2, and Seiji Tsurumi 1*

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

* To whom correspondence should be addressed.
Seiji Tsurumi, E-mail: tsurumis{at}scitec.kobe-u.ac.jp


  Abstract

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 naturally-occurring auxin indole-3-butyric acid (IBA). The acropetal and basipetal transports of IBA are 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 influx carrier system for IBA in rice roots.

Keywords: auxin influx carrier; auxin transport; IAA; IBA; Oryza sativa L.; rice root.
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