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Title: Strigolactones inhibit auxin feedback on PIN-dependent auxin transport canalization
Authors: Zhang, Jing
Mazur, Ewa
Balla, Józef
Gallei, Michelle
Kalousek, Petr
Medveďová, Zuzana
Li, Yang
Wang, Yaping
Prát, Tomáš
Vasileva, Mina
Reinöhl, Vilém
Procházka, Stanislav
Halouzka, Rostislav
Tarkowsk, Petr
Luschnig, Christian
Brewer, Philip B.
Friml, Jiří
Keywords: Plant cell biology; Plant development; Plant hormones
Issue Date: 2020
Citation: "Nature Communications" iss. 11 (2020), art. no. 3508
Abstract: 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.
DOI: 10.1038/s41467-020-17252-y
ISSN: 2041-1723
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