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Chloroplast Auxin Efflux Mediated by ABCB28 and ABCB29 Fine-Tunes Salt and Drought Stress Responses in Arabidopsis
- 1.0585624 - ÚEB 2025 RIV CH eng J - Journal Article
Tamizhselvan, P. - Madhavan, S. - Constan-Aguilar, C. - Elrefaay, E. R. - Liu, J. - Pěnčík, Aleš - Novák, Ondřej - Cairó, A. - Hrtyan, M. - Geisler, M. - Tognetti, V. B.
Chloroplast Auxin Efflux Mediated by ABCB28 and ABCB29 Fine-Tunes Salt and Drought Stress Responses in Arabidopsis.
Plants. Roč. 13, č. 1 (2024), č. článku 7. E-ISSN 2223-7747
R&D Projects: GA ČR GA20-22875S; GA MŠMT(CZ) LM2015062
Institutional support: RVO:61389030
Keywords : ABC transporter * auxin * drought * hormone transport * photosynthesis * salinity * stress
OECD category: Biochemistry and molecular biology
Impact factor: 4.5, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/plants13010007
Photosynthesis is among the first processes negatively affected by environmental cues and its performance directly determines plant cell fitness and ultimately crop yield. Primarily sites of photosynthesis, chloroplasts are unique sites also for the biosynthesis of precursors of the growth regulator auxin and for sensing environmental stress, but their role in intracellular auxin homeostasis, vital for plant growth and survival in changing environments, remains poorly understood. Here, we identified two ATP-binding cassette (ABC) subfamily B transporters, ABCB28 and ABCB29, which export auxin across the chloroplast envelope to the cytosol in a concerted action in vivo. Moreover, we provide evidence for an auxin biosynthesis pathway in Arabidopsis thaliana chloroplasts. The overexpression of ABCB28 and ABCB29 influenced stomatal regulation and resulted in significantly improved water use efficiency and survival rates during salt and drought stresses. Our results suggest that chloroplast auxin production and transport contribute to stomata regulation for conserving water upon salt stress. ABCB28 and ABCB29 integrate photosynthesis and auxin signals and as such hold great potential to improve the adaptation potential of crops to environmental cues.
Permanent Link: https://hdl.handle.net/11104/0353304
File Download Size Commentary Version Access 2024_Tamizhselvan_PLANTS-BASEL_7.pdf 1 6.2 MB Other open-access
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