RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis

Li L, Chen H, Alotaibi SS, Pěnčík A, Adamowski M, Novák O, Friml J. 2022. RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis. Proceedings of the National Academy of Sciences. 119(31), e2121058119.

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Author
Li, LanxinISTA ; Chen, HuihuangISTA; Alotaibi, Saqer S.; Pěnčík, Aleš; Adamowski, MaciekISTA ; Novák, Ondřej; Friml, JiríISTA
Abstract
Plant cell growth responds rapidly to various stimuli, adapting architecture to environmental changes. Two major endogenous signals regulating growth are the phytohormone auxin and the secreted peptides rapid alkalinization factors (RALFs). Both trigger very rapid cellular responses and also exert long-term effects [Du et al., Annu. Rev. Plant Biol. 71, 379–402 (2020); Blackburn et al., Plant Physiol. 182, 1657–1666 (2020)]. However, the way, in which these distinct signaling pathways converge to regulate growth, remains unknown. Here, using vertical confocal microscopy combined with a microfluidic chip, we addressed the mechanism of RALF action on growth. We observed correlation between RALF1-induced rapid Arabidopsis thaliana root growth inhibition and apoplast alkalinization during the initial phase of the response, and revealed that RALF1 reversibly inhibits primary root growth through apoplast alkalinization faster than within 1 min. This rapid apoplast alkalinization was the result of RALF1-induced net H+ influx and was mediated by the receptor FERONIA (FER). Furthermore, we investigated the cross-talk between RALF1 and the auxin signaling pathways during root growth regulation. The results showed that RALF-FER signaling triggered auxin signaling with a delay of approximately 1 h by up-regulating auxin biosynthesis, thus contributing to sustained RALF1-induced growth inhibition. This biphasic RALF1 action on growth allows plants to respond rapidly to environmental stimuli and also reprogram growth and development in the long term.
Publishing Year
Date Published
2022-07-25
Journal Title
Proceedings of the National Academy of Sciences
Acknowledgement
We thank Sarah M. Assmann, Kris Vissenberg, and Nadine Paris for kindly sharing seeds; Matyas Fendrych for initiating this project and providing constant support; Lukas Fiedler for revising the manuscript; and Huibin Han and Arseny Savin for contributing to genotyping. This work was supported by the Austrian Science Fund (FWF) I 3630-B25 (to J.F.) and the Doctoral Fellowship Progrmme of the Austrian Academy of Sciences (to L.L.) We also acknowledge Taif University Researchers Supporting Project TURSP-HC2021/02 and funding “Plants as a tool for sustainable global development (no. CZ.02.1.01/0.0/0.0/16_019/0000827).”
Volume
119
Issue
31
Article Number
e2121058119
IST-REx-ID

Cite this

Li L, Chen H, Alotaibi SS, et al. RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis. Proceedings of the National Academy of Sciences. 2022;119(31). doi:10.1073/pnas.2121058119
Li, L., Chen, H., Alotaibi, S. S., Pěnčík, A., Adamowski, M., Novák, O., & Friml, J. (2022). RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis. Proceedings of the National Academy of Sciences. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.2121058119
Li, Lanxin, Huihuang Chen, Saqer S. Alotaibi, Aleš Pěnčík, Maciek Adamowski, Ondřej Novák, and Jiří Friml. “RALF1 Peptide Triggers Biphasic Root Growth Inhibition Upstream of Auxin Biosynthesis.” Proceedings of the National Academy of Sciences. Proceedings of the National Academy of Sciences, 2022. https://doi.org/10.1073/pnas.2121058119.
L. Li et al., “RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis,” Proceedings of the National Academy of Sciences, vol. 119, no. 31. Proceedings of the National Academy of Sciences, 2022.
Li L, Chen H, Alotaibi SS, Pěnčík A, Adamowski M, Novák O, Friml J. 2022. RALF1 peptide triggers biphasic root growth inhibition upstream of auxin biosynthesis. Proceedings of the National Academy of Sciences. 119(31), e2121058119.
Li, Lanxin, et al. “RALF1 Peptide Triggers Biphasic Root Growth Inhibition Upstream of Auxin Biosynthesis.” Proceedings of the National Academy of Sciences, vol. 119, no. 31, e2121058119, Proceedings of the National Academy of Sciences, 2022, doi:10.1073/pnas.2121058119.
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