Cited by 407Plant Molecular Biology ResearchLight effects on plantsPlant Parasitism and Resistance

The NPH4 Locus Encodes the Auxin Response Factor ARF7, a Conditional Regulator of Differential Growth in Aerial Arabidopsis Tissue

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Harper, Reneé M., Stowe-Evans, Emily L., Luesse, Darron R., Muto, Hideki, Tatematsu, Kiyoshi, Watahiki, Masaaki K., Yamamoto, Kotaro, Liscum, Emmanuel·2000·The Plant Cell

Abstract

Organ bending through differential growth represents a major mechanism by which plants are able to adaptively alter their morphology in response to local changes in the environment. Two plant hormones, auxin and ethylene, have been implicated as regulators of differential growth responses; however, the mechanisms by which they elicit their effects remain largely unknown. Here, we describe isolation of the NPH4 gene of Arabidopsis, which is conditionally required for differential growth responses of aerial tissues, and we report that NPH4 encodes the auxin-regulated transcriptional activator ARF7. The phenotypes of nph4 mutants, which include multiple differential growth defects associated with reduced auxin responsiveness, including impaired auxin-induced gene expression, are consistent with the predicted loss of function of a transcriptional activator, and these phenotypes indicate that auxin-dependent changes in gene transcription are prerequisite for proper organ bending responses. Although NPH4/ARF7 appears to be a major regulator of differential growth, it is not the sole regulator because phenotypes of nph4 null mutants were suppressed by application of ethylene. This latter finding illustrates the intimate connection between auxin and ethylene in the control of growth in higher plants.

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  • NPH4/ARF7 was identified by screening of phototropism-deficient mutants.

    “NPH4/ARF7 was identified by screening of phototropism-deficient mutants (Harper et al., 2000).”
  • NPH3, RPT2, and PKS1 interact with PHOT1 and participate in the regulation of hypocotyl phototropism.

    “Interaction screening revealed that NPH3, RPT2, and PKS1 interact with PHOT1 and participate in the regulation of hypocotyl phototropism (Motchoulski and Liscum, 1999; Harper et al., 2000; Inada et al., 2004).”

    From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Harper et al., 2000

    The passages on ethylene-dependent suppression of nph4 mutants discuss hypocotyl phototropism and the nph1 photoreceptor mutant, not interactions between PHOT1 and NPH3, RPT2, or PKS1. Searches for those proteins and interaction screening found no passage in our copy addressing the attributed interaction claim. (LLM, conf=0.75)

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Research works printed but not linked: 1

  1. Lomax, T.L., Muday, G.K., and Rubery, P.H. (1995). Auxin trans- port. In Plant Hormones, P.J. Davies, ed (Dordrecht, The Nether- lands: Kluwer Academic Publishers), pp. 509-530.

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Authors
Harper, R. M., Stowe-Evans, E. L., Luesse, D. R., Muto, H., Tatematsu, K., Watahiki, M. K., Yamamoto, K., & Liscum, E.
Affiliations
  • University of Missouri (US)
  • Hokkaido University (JP)
  • Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211
Venue
The Plant Cell
Published
2000-05
Volume
12
Issue
5
Pages
757-770
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2142847136
Cited by
407
References
89
Citations by year
2026: 1 · 2025: 6 · 2024: 12 · 2023: 8 · 2022: 14 · 2021: 11 · 2020: 13 · 2019: 10 · 2018: 16 · 2017: 22 · 2016: 7 · 2015: 10 · 2014: 20 · 2013: 12 · 2012: 22
FWCI
35.17
Type
journal article
Language
en
Open access
Locations
  • The Plant Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (9723124)
  • U.S. Department of Energy
  • U.S. Department of Agriculture
  • Ohio State University
  • University of Missouri
  • Institute of Innovative Research, Tokyo Institute of Technology
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
Keywords
ARF7, auxin response factor, differential growth, ethylene, auxin-ethylene interaction, transcriptional activator, Arabidopsis thaliana
MeSH terms
Base Sequence, Cloning, Molecular, Ethylenes, Genes, Regulator, Indoleacetic Acids, Mutation, Phenotype, Genes, Plant, Arabidopsis, DNA Primers, Gravitropism

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