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Auxin Transport Is Required for Hypocotyl Elongation in Light-Grown but Not Dark-Grown Arabidopsis1

Philip J. Jensen*, Roger P. Hangarter, and Mark Estelle

Department of Biology, Indiana University, Bloomington, Indiana 47405

Many auxin responses are dependent on redistribution and/or polar transport of indoleacetic acid. Polar transport of auxin can be inhibited through the application of phytotropins such as 1-naphthylphthalamic acid (NPA). When Arabidopsis thaliana seedlings were grown in the light on medium containing 1.0 µm NPA, hypocotyl and root elongation and gravitropism were strongly inhibited. When grown in darkness, however, NPA disrupted the gravity response but did not affect elongation. The extent of inhibition of hypocotyl elongation by NPA increased in a fluence-rate-dependent manner to a maximum of about 75% inhibition at 50 µmol m-2 s-1 of white light. Plants grown under continuous blue or far-red light showed NPA-induced hypocotyl inhibition similar to that of white-light-grown plants. Plants grown under continuous red light showed less NPA-induced inhibition. Analysis of photoreceptor mutants indicates the involvement of phytochrome and cryptochrome in mediating this NPA response. Hypocotyls of some auxin-resistant mutants had decreased sensitivity to NPA in the light, but etiolated seedlings of these mutants were similar in length to the wild type. These results indicate that light has a significant effect on NPA-induced inhibition in Arabidopsis, and suggest that auxin has a more important role in elongation responses in light-grown than in dark-grown seedlings.

1   This work was supported by National Science Foundation grants to M.E. (no. IBN-9604398) and R.P.H. (no. IBN-9596186).
*   Corresponding author; e-mail phjensen{at}indiana.edu; fax 1-812-855-6705.

Plant Physiol. (1998) 116: 455-462
Copyright Clearance Center:   0032-0889/98/116/0455/08
© 1998 American Society of Plant Physiologists




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