Chloroplast Auxin Efflux Mediated by ABCB28 and ABCB29 Fine-Tunes Salt and Drought Stress Responses in Arabidopsis

0585624 - ÚEB 2025 RIV CH eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA20-22875S; GA MŠMT(CZ) LM2015062
Institucionální podpora: RVO:61389030
Klíčová slova: ABC transporter * auxin * drought * hormone transport * photosynthesis * salinity * stress
Obor OECD: Biochemistry and molecular biology
Impakt faktor: 4.5, rok: 2022
Způsob publikování: 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.
Trvalý link: https://hdl.handle.net/11104/0353304