Transcription of specific auxin efflux and influx carriers drives auxin homeostasis in tobacco cells

0517328 - ÚEB 2020 RIV GB eng J - Článek v odborném periodiku
Müller, Karel - Hošek, Petr - Laňková, Martina - Vosolsobě, S. - Malínská, Kateřina - Čarná, Mária - Fílová, Markéta - Dobrev, Petre - Helusová, Michaela - Hoyerová, Klára - Petrášek, Jan
Transcription of specific auxin efflux and influx carriers drives auxin homeostasis in tobacco cells.
Plant Journal. Roč. 100, č. 3 (2019), s. 627-640. ISSN 0960-7412. E-ISSN 1365-313X
Grant CEP: GA MŠMT(CZ) EF16_013/0001775; GA MŠMT(CZ) EF16_019/0000738; GA ČR GA16-10948S; GA ČR(CZ) GA16-19557S
Institucionální podpora: RVO:61389030
Klíčová slova: aux1/lax * auxin efflux carrier * auxin homeostasis * auxin influx carrier * auxin transport * Nicotiana tabacum * pin * tobacco BY-2 cells
Obor OECD: Biochemical research methods
Impakt faktor: 6.141, rok: 2019
Způsob publikování: Open access
http://dx.doi.org/10.1111/tpj.14474

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/.
Trvalý link: http://hdl.handle.net/11104/0302657