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Plant Physiol, February 2000, Vol. 122, pp. 481-490

Basipetal Auxin Transport Is Required for Gravitropism in Roots of Arabidopsis1

Aaron M. Rashotte,2 Shari R. Brady,2 Robyn C. Reed,3 Sandra J. Ante, and Gloria K. Muday*

Department of Biology, Wake Forest University, Box 7325, Winston-Salem, North Carolina 27109-7325.

Auxin transport has been reported to occur in two distinct polarities, acropetally and basipetally, in two different root tissues. The goals of this study were to determine whether both polarities of indole-3-acetic acid (IAA) transport occur in roots of Arabidopsis and to determine which polarity controls the gravity response. Global application of the auxin transport inhibitor naphthylphthalamic acid (NPA) to roots blocked the gravity response, root waving, and root elongation. Immediately after the application of NPA, the root gravity response was completely blocked, as measured by an automated video digitizer. Basipetal [3H]IAA transport in Arabidopsis roots was inhibited by NPA, whereas the movement of [14C]benzoic acid was not affected. Inhibition of basipetal IAA transport by local application of NPA blocked the gravity response. Inhibition of acropetal IAA transport by application of NPA at the root-shoot junction only partially reduced the gravity response at high NPA concentrations. Excised root tips, which do not receive auxin from the shoot, exhibited a normal response to gravity. The Arabidopsis mutant eir1, which has agravitropic roots, exhibited reduced basipetal IAA transport but wild-type levels of acropetal IAA transport. These results support the hypothesis that basipetally transported IAA controls root gravitropism in Arabidopsis.

1 This work was supported by the National Aeronautics and Space Administration (NASA; grant no. NAG2-1203 to G.K.M.) and the NASA Specialized Center for Research and Training at North Carolina State University to G.K.M., A.M.R., and S.J.A.

2 These authors contributed equally to the paper.

3 Present address: Duke University Medical Center, P.O. Box 2776, Durham, NC 27708.

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

© 2000 American Society of Plant Physiologists


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