Cited by 431Plant Molecular Biology ResearchLight effects on plantsPlant Parasitism and Resistance

MASSUGU2 Encodes Aux/IAA19, an Auxin-Regulated Protein That Functions Together with the Transcriptional Activator NPH4/ARF7 to Regulate Differential Growth Responses of Hypocotyl and Formation of Lateral Roots in Arabidopsis thaliana

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Tatematsu, Kiyoshi, Kumagai, Satoshi, Muto, Hideki, Sato, Atsuko, Watahiki, Masaaki K., Harper, Reneé M., Liscum, Emmanuel, Yamamoto, Kotaro T.·2004·The Plant Cell

Abstract

We have isolated a dominant, auxin-insensitive mutant of Arabidopsis thaliana, massugu2 (msg2), that displays neither hypocotyl gravitropism nor phototropism, fails to maintain an apical hook as an etiolated seedling, and is defective in lateral root formation. Yet other aspects of growth and development of msg2 plants are almost normal. These characteristics of msg2 are similar to those of another auxin-insensitive mutant, non-phototropic hypocotyl4 (nph4), which is a loss-of-function mutant of AUXIN RESPONSE FACTOR7 (ARF7) (Harper et al., 2000). Map-based cloning of the MSG2 locus reveals that all four mutant alleles result in amino acid substitutions in the conserved domain II of an Auxin/Indole-3-Acetic Acid protein, IAA19. Interestingly, auxin inducibility of MSG2/IAA19 gene expression is reduced by 65% in nph4/arf7. Moreover, MSG2/IAA19 protein binds to the C-terminal domain of NPH4/ARF7 in a Saccharomyces cerevisiae (yeast) two-hybrid assay and to the whole latter protein in vitro by pull-down assay. These results suggest that MSG2/IAA19 and NPH4/ARF7 may constitute a negative feedback loop to regulate differential growth responses of hypocotyls and lateral root formation.

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  1. Ausubel, F.M., Brent, R., Kingston, R.E., Moore, D.D., Seidman, J.G., Smith, J.A., and Struhl, K. (1990). Current Protocols in Molecular Biology. (New York: Wiley InterScience).

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Authors
Tatematsu, K., Kumagai, S., Muto, H., Sato, A., Watahiki, M. K., Harper, R. M., Liscum, E., & Yamamoto, K. T.
Affiliations
  • Hokkaido University (JP)
  • Division of Biological Sciences, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211
Venue
The Plant Cell
Published
2004-01-16
Volume
16
Issue
2
Pages
379-393
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2128748045
Cited by
431
References
77
Citations by year
2026: 10 · 2025: 15 · 2024: 16 · 2023: 18 · 2022: 22 · 2021: 9 · 2020: 15 · 2019: 18 · 2018: 20 · 2017: 24 · 2016: 14 · 2015: 16 · 2014: 21 · 2013: 24 · 2012: 32
FWCI
31.78
Type
journal article
Language
en
Open access
Locations
  • The Plant Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
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
Aux/IAA proteins, ARF7, auxin response factor, phototropism, apical hook, lateral root formation, auxin signaling, negative feedback loop, transcriptional activator, positional cloning, Arabidopsis thaliana
MeSH terms
Amino Acid Sequence, Chlorophyll, Indoleacetic Acids, Molecular Sequence Data, Mutation, Nuclear Proteins, Phenotype, Plant Growth Regulators, Reproduction, Saccharomyces cerevisiae, Trans-Activators, Arabidopsis, Gene Expression Regulation, Plant, Gene Expression Regulation, Developmental, Plant Roots, Hypocotyl, Two-Hybrid System Techniques, Arabidopsis Proteins

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