A role for the auxin precursor anthranilic acid in root gravitropism via regulation of PIN-FORMED protein polarity and relocalisation in Arabidopsis
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
31038751
DOI
10.1111/nph.15877
Knihovny.cz E-resources
- Keywords
- Arabidopsis thaliana, PIN polarity, PIN-FORMED proteins, anthranilic acid (AA), auxin transport, root gravitropism,
- MeSH
- Arabidopsis drug effects metabolism MeSH
- Quinolones pharmacology MeSH
- Gravitropism physiology MeSH
- Plant Roots anatomy & histology drug effects growth & development physiology MeSH
- Indoleacetic Acids chemistry metabolism MeSH
- Mutation genetics MeSH
- ortho-Aminobenzoates chemistry metabolism pharmacology MeSH
- Cell Polarity * drug effects MeSH
- Arabidopsis Proteins metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- anthranilic acid MeSH Browser
- Quinolones MeSH
- Indoleacetic Acids MeSH
- ortho-Aminobenzoates MeSH
- Arabidopsis Proteins MeSH
distribution of auxin within plant tissues is of great importance for developmental plasticity, including root gravitropic growth. Auxin flow is directed by the subcellular polar distribution and dynamic relocalisation of auxin transporters such as the PIN-FORMED (PIN) efflux carriers, which can be influenced by the main natural plant auxin indole-3-acetic acid (IAA). Anthranilic acid (AA) is an important early precursor of IAA and previously published studies with AA analogues have suggested that AA may also regulate PIN localisation. Using Arabidopsis thaliana as a model species, we studied an AA-deficient mutant displaying agravitropic root growth, treated seedlings with AA and AA analogues and transformed lines to over-produce AA while inhibiting its conversion to downstream IAA precursors. We showed that AA rescues root gravitropic growth in the AA-deficient mutant at concentrations that do not rescue IAA levels. Overproduction of AA affects root gravitropism without affecting IAA levels. Treatments with, or deficiency in, AA result in defects in PIN polarity and gravistimulus-induced PIN relocalisation in root cells. Our results revealed a previously unknown role for AA in the regulation of PIN subcellular localisation and dynamics involved in root gravitropism, which is independent of its better known role in IAA biosynthesis.
Central European Institute of Technology Masaryk University 62500 Brno Czech Republic
Department of Chemistry Umeå University 90736 Umeå Sweden
Department of Plant Biotechnology and Bioinformatics Ghent University 9052 Ghent Belgium
Department of Plant Systems Biology Vlaams Instituut voor Biotechnologie 9052 Ghent Belgium
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