Dr Mauro Rinaldi M.Rinaldi@hull.ac.uk
Lecturer in Biotechnology and Biochemistry
A gain-of-function mutation in IAA16 confers reduced responses to auxin and abscisic acid and impedes plant growth and fertility
Rinaldi, Mauro A.; Liu, James; Enders, Tara A.; Bartel, Bonnie; Strader, Lucia C.
Authors
James Liu
Tara A. Enders
Bonnie Bartel
Lucia C. Strader
Abstract
Auxin regulates many aspects of plant development, in part, through degradation of the Aux/IAA family of transcriptional repressors. Consequently, stabilizing mutations in several Aux/IAA proteins confer reduced auxin responsiveness. However, of the 29 apparent Aux/IAA proteins in Arabidopsis thaliana, fewer than half have roles established through mutant analysis. We identified iaa16-1, a dominant gain-of-function mutation in IAA16 (At3g04730), in a novel screen for reduced root responsiveness to abscisic acid. The iaa16-1 mutation also confers dramatically reduced auxin responses in a variety of assays, markedly restricts growth of adult plants, and abolishes fertility when homozygous. We compared iaa16-1 phenotypes with those of dominant mutants defective in the closely related IAA7/AXR2, IAA14/SLR, and IAA17/AXR3, along with the more distantly related IAA28, and found overlapping but distinct patterns of developmental defects. The identification and characterization of iaa16-1 provides a fuller understanding of the IAA7/IAA14/IAA16/IAA17 clade of Aux/IAA proteins and the diverse roles of these repressors in hormone response and plant development. © 2012 Springer Science+Business Media B.V.
Citation
Rinaldi, M. A., Liu, J., Enders, T. A., Bartel, B., & Strader, L. C. (2012). A gain-of-function mutation in IAA16 confers reduced responses to auxin and abscisic acid and impedes plant growth and fertility. Plant Molecular Biology, 79(4-5), 359-373. https://doi.org/10.1007/s11103-012-9917-y
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 22, 2012 |
Online Publication Date | May 12, 2012 |
Publication Date | Jul 1, 2012 |
Deposit Date | Aug 12, 2023 |
Journal | Plant Molecular Biology |
Print ISSN | 0167-4412 |
Publisher | Springer |
Peer Reviewed | Peer Reviewed |
Volume | 79 |
Issue | 4-5 |
Pages | 359-373 |
DOI | https://doi.org/10.1007/s11103-012-9917-y |
Keywords | Auxin signaling; Abscisic acid; Aux/IAA gain of function; IAA16 |
Public URL | https://hull-repository.worktribe.com/output/4355500 |
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