DOI: 10.1104/pp.116.2.455. Auxin Transport Is Required for Hypocotyl Elongation in Light-Grown but Not Dark-Grown Arabidopsis1

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

10.1104/pp.116.2.455

Crossref journal-article

Oxford University Press (OUP)

Plant Physiology (286)

Abstract

Abstract 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). WhenArabidopsis 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.

Bibliography

Jensen, P. J., Hangarter, R. P., & Estelle, M. (1998). Auxin Transport Is Required for Hypocotyl Elongation in Light-Grown but Not Dark-Grown Arabidopsis1. Plant Physiology, 116(2), 455â462.

Authors 3

Philip J. Jensen (first)
Roger P. Hangarter (additional)
Mark Estelle (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 27, 2002, 1 a.m.)
Deposited	4 years, 3 months ago (May 3, 2021, 5:35 a.m.)
Indexed	3 weeks, 1 day ago (Aug. 7, 2025, 5:23 p.m.)
Issued	27 years, 6 months ago (Feb. 1, 1998)
Published	27 years, 6 months ago (Feb. 1, 1998)
Published Online	27 years, 6 months ago (Feb. 1, 1998)
Published Print	27 years, 6 months ago (Feb. 1, 1998)

Funders 0

None

BibTeX

@article{Jensen_1998, title={Auxin Transport Is Required for Hypocotyl Elongation in Light-Grown but Not Dark-Grown Arabidopsis1}, volume={116}, ISSN={0032-0889}, url={http://dx.doi.org/10.1104/pp.116.2.455}, DOI={10.1104/pp.116.2.455}, number={2}, journal={Plant Physiology}, publisher={Oxford University Press (OUP)}, author={Jensen, Philip J. and Hangarter, Roger P. and Estelle, Mark}, year={1998}, month=feb, pages={455–462} }

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  "abstract": "<jats:title>Abstract</jats:title>\n               <jats:p>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). WhenArabidopsis thaliana seedlings were grown in the light on medium containing 1.0 \u03bcm 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 \u03bcmol m\u22122 s\u22121 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.</jats:p>",
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