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Transcription of specific auxin efflux and influx carriers drives auxin homeostasis in tobacco cells
K. Müller, P. Hošek, M. Laňková, S. Vosolsobě, K. Malínská, M. Čarná, M. Fílová, PI. Dobrev, M. Helusová, K. Hoyerová, J. Petrášek,
Language English Country Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
E-resources NLK Online Full text
Free Medical Journals from 1991 to 1 year agoWiley Free Content from 1997 to 1 year ago
Links
PubMed
31349380
DOI
10.1111/tpj.14474
Knihovny.cz E-resources
- MeSH
- Biological Transport MeSH
- Cell Line MeSH
- Phylogeny MeSH
- Homeostasis MeSH
- Indoleacetic Acids metabolism MeSH
- Membrane Transport Proteins genetics metabolism MeSH
- Arabidopsis Proteins genetics metabolism MeSH
- Plant Growth Regulators metabolism MeSH
- Plant Proteins genetics metabolism MeSH
- Nicotiana genetics physiology MeSH
- Models, Theoretical MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Auxin concentration gradients are informative for the transduction of many developmental cues, triggering downstream gene expression and other responses. The generation of auxin gradients depends significantly on cell-to-cell auxin transport, which is supported by the activities of auxin efflux and influx carriers. However, at the level of individual plant cell, the co-ordination of auxin efflux and influx largely remains uncharacterized. We addressed this issue by analyzing the contribution of canonical PIN-FORMED (PIN) proteins to the carrier-mediated auxin efflux in Nicotiana tabacum L., cv. Bright Yellow (BY-2) tobacco cells. We show here that a majority of canonical NtPINs are transcribed in cultured cells and in planta. Cloning of NtPIN genes and their inducible overexpression in tobacco cells uncovered high auxin efflux activity of NtPIN11, accompanied by auxin starvation symptoms. Auxin transport parameters after NtPIN11 overexpression were further assessed using radiolabelled auxin accumulation and mathematical modelling. Unexpectedly, these experiments showed notable stimulation of auxin influx, which was accompanied by enhanced transcript levels of genes for a specific auxin influx carrier and by decreased transcript levels of other genes for auxin efflux carriers. A similar transcriptional response was observed upon removal of auxin from the culture medium, which resulted in decreased auxin efflux. Overall, our results revealed an auxin transport-based homeostatic mechanism for the maintenance of endogenous auxin levels. OPEN RESEARCH BADGES: This article has earned an Open Data Badge for making publicly available the digitally-shareable data necessary to reproduce the reported results. The data is available at http://osf.io/ka97b/.
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- $a Auxin concentration gradients are informative for the transduction of many developmental cues, triggering downstream gene expression and other responses. The generation of auxin gradients depends significantly on cell-to-cell auxin transport, which is supported by the activities of auxin efflux and influx carriers. However, at the level of individual plant cell, the co-ordination of auxin efflux and influx largely remains uncharacterized. We addressed this issue by analyzing the contribution of canonical PIN-FORMED (PIN) proteins to the carrier-mediated auxin efflux in Nicotiana tabacum L., cv. Bright Yellow (BY-2) tobacco cells. We show here that a majority of canonical NtPINs are transcribed in cultured cells and in planta. Cloning of NtPIN genes and their inducible overexpression in tobacco cells uncovered high auxin efflux activity of NtPIN11, accompanied by auxin starvation symptoms. Auxin transport parameters after NtPIN11 overexpression were further assessed using radiolabelled auxin accumulation and mathematical modelling. Unexpectedly, these experiments showed notable stimulation of auxin influx, which was accompanied by enhanced transcript levels of genes for a specific auxin influx carrier and by decreased transcript levels of other genes for auxin efflux carriers. A similar transcriptional response was observed upon removal of auxin from the culture medium, which resulted in decreased auxin efflux. Overall, our results revealed an auxin transport-based homeostatic mechanism for the maintenance of endogenous auxin levels. OPEN RESEARCH BADGES: This article has earned an Open Data Badge for making publicly available the digitally-shareable data necessary to reproduce the reported results. The data is available at http://osf.io/ka97b/.
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