Directional transport of the phytohormone auxin is a versatile, plant-specific mechanism regulating many aspects of plant development. The recently identified plant hormones, strigolactones (SLs), are implicated in many plant traits; among others, they modify the phenotypic output of PIN-FORMED (PIN) auxin transporters for fine-tuning of growth and developmental responses. Here, we show in pea and Arabidopsis that SLs target processes dependent on the canalization of auxin flow, which involves auxin feedback on PIN subcellular distribution. D14 receptor- and MAX2 F-box-mediated SL signaling inhibits the formation of auxin-conducting channels after wounding or from artificial auxin sources, during vasculature de novo formation and regeneration. At the cellular level, SLs interfere with auxin effects on PIN polar targeting, constitutive PIN trafficking as well as clathrin-mediated endocytosis. Our results identify a non-transcriptional mechanism of SL action, uncoupling auxin feedback on PIN polarity and trafficking, thereby regulating vascular tissue formation and regeneration.
We are grateful to David Nelson for providing published materials and extremely helpful comments, and Elizabeth Dun and Christine Beveridge for helpful discussions. The research leading to these results has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (742985). This work was also supported by the Beijing Municipal Natural Science Foundation (5192011), Beijing Outstanding University Discipline Program, the National Natural Science Foundation of China (31370309), CEITEC 2020 (LQ1601) project with financial contribution made by the Ministry of Education, Youth and Sports of the Czech Republic within special support paid from the National Program of Sustainability II funds, Australian Research Council (FT180100081), and China Postdoctoral Science Foundation (2019M660864).
Zhang J, Mazur E, Balla J, et al. Strigolactones inhibit auxin feedback on PIN-dependent auxin transport canalization. Nature Communications. 2020;11(1):3508. doi:10.1038/s41467-020-17252-y
Zhang, J., Mazur, E., Balla, J., Gallei, M. C., Kalousek, P., Medveďová, Z., … Friml, J. (2020). Strigolactones inhibit auxin feedback on PIN-dependent auxin transport canalization. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-020-17252-y
Zhang, J, E Mazur, J Balla, Michelle C Gallei, P Kalousek, Z Medveďová, Y Li, et al. “Strigolactones Inhibit Auxin Feedback on PIN-Dependent Auxin Transport Canalization.” Nature Communications. Springer Nature, 2020. https://doi.org/10.1038/s41467-020-17252-y.
J. Zhang et al., “Strigolactones inhibit auxin feedback on PIN-dependent auxin transport canalization,” Nature Communications, vol. 11, no. 1. Springer Nature, p. 3508, 2020.
Zhang J, Mazur E, Balla J, Gallei MC, Kalousek P, Medveďová Z, Li Y, Wang Y, Prat T, Vasileva MK, Reinöhl V, Procházka S, Halouzka R, Tarkowski P, Luschnig C, Brewer P, Friml J. 2020. Strigolactones inhibit auxin feedback on PIN-dependent auxin transport canalization. Nature Communications. 11(1), 3508.
Zhang, J., et al. “Strigolactones Inhibit Auxin Feedback on PIN-Dependent Auxin Transport Canalization.” Nature Communications, vol. 11, no. 1, Springer Nature, 2020, p. 3508, doi:10.1038/s41467-020-17252-y.
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