Journal Article

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

Tory Chhun, Shin Taketa, Masahiko Ichii and Seiji Tsurumi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 7, pages 1161-1164
Published in print July 2005 | ISSN: 0032-0781
Published online July 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci117
Involvement of ARM2 in the Uptake of Indole-3-butyric Acid in Rice (Oryza sativa L.) Roots

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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.

Keywords: Auxin influx carrier; Auxin transport; IAA; IBA; Oryza sativa L.; Rice root; IBA, indole-3-butyric acid; 2,4-D, 2,4-dichlorophenoxyacetic acid; MES, 2-(N-morpholino)ethanesulfonic acid; NAA, 1-naphthaleneacetic acid; NOA, 1-naphthoxyacetic acid

Journal Article.  3304 words.  Illustrated.

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

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