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First published online October 2, 2003; 10.1104/pp.103.022582

Plant Physiology 133:761-772 (2003)
© 2003 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

Transport of the Two Natural Auxins, Indole-3-Butyric Acid and Indole-3-Acetic Acid, in Arabidopsis1

Aaron M. Rashotte2, Julie Poupart, Candace S. Waddell and Gloria K. Muday*

Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109 (A.M.R., G.K.M.); and Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1 (J.P., C.S.W.)

Polar transport of the natural auxin indole-3-acetic acid (IAA) is important in a number of plant developmental processes. However, few studies have investigated the polar transport of other endogenous auxins, such as indole-3-butyric acid (IBA), in Arabidopsis. This study details the similarities and differences between IBA and IAA transport in several tissues of Arabidopsis. In the inflorescence axis, no significant IBA movement was detected, whereas IAA is transported in a basipetal direction from the meristem tip. In young seedlings, both IBA and IAA were transported only in a basipetal direction in the hypocotyl. In roots, both auxins moved in two distinct polarities and in specific tissues. The kinetics of IBA and IAA transport appear similar, with transport rates of 8 to 10 mm per hour. In addition, IBA transport, like IAA transport, is saturable at high concentrations of auxin, suggesting that IBA transport is protein mediated. Interestingly, IAA efflux inhibitors and mutations in genes encoding putative IAA transport proteins reduce IAA transport but do not alter IBA movement, suggesting that different auxin transport protein complexes are likely to mediate IBA and IAA transport. Finally, the physiological effects of IBA and IAA on hypocotyl elongation under several light conditions were examined and analyzed in the context of the differences in IBA and IAA transport. Together, these results present a detailed picture of IBA transport and provide the basis for a better understanding of the transport of these two endogenous auxins.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.022582.

1 This work was supported by the National Aeronautics and Space Administration Specialized Center for Research and Training (North Carolina State University; grants to A.M.R. and G.K.M.), by the National Aeronautics and Space Administration (grant no. NAG2–1507 to G.K.M.), by J.W. McConnell McGill University (Majors Fellowship to J.P.), and by the Natural Sciences and Engineering Research Council of Canada (grant to C.S.W.).

2 Present address: Biology Department, University of North Carolina, Chapel Hill, North Carolina 27599.

* Corresponding author; e-mail muday{at}wfu.edu; fax 336–758–6008.

Received February 25, 2003; returned for revision March 20, 2003; accepted May 29, 2003.




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