IPyA glucosylation mediates light and temperature signaling to regulate auxin-dependent hypocotyl elongation in Arabidopsis

Proceedings of the National Academy of Sciences of the United States of America
Lu ChenBing-Kai Hou

Abstract

Auxin is a class of plant hormone that plays a crucial role in the life cycle of plants, particularly in the growth response of plants to ever-changing environments. Since the auxin responses are concentration-dependent and higher auxin concentrations might often be inhibitory, the optimal endogenous auxin level must be closely controlled. However, the underlying mechanism governing auxin homeostasis remains largely unknown. In this study, a UDP-glycosyltransferase (UGT76F1) was identified from Arabidopsis thaliana, which participates in the regulation of auxin homeostasis by glucosylation of indole-3-pyruvic acid (IPyA), a major precursor of the auxin indole-3-acetic acid (IAA) biosynthesis, in the formation of IPyA glucose conjugates (IPyA-Glc). In addition, UGT76F1 was found to mediate hypocotyl growth by modulating active auxin levels in a light- and temperature-dependent manner. Moreover, the transcription of UGT76F1 was demonstrated to be directly and negatively regulated by PIF4, which is a key integrator of both light and temperature signaling pathways. This study sheds a light on the trade-off between IAA biosynthesis and IPyA-Glc formation in controlling auxin levels and reveals a regulatory mechanism for plant growth...Continue Reading

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Citations

Mar 21, 2020·Proceedings of the National Academy of Sciences of the United States of America·Arielle L Homayouni, Lucia C Strader
Jul 30, 2020·Plants·Jesse J KüpersRonald Pierik
Nov 21, 2020·Journal of Integrative Plant Biology·Bingsheng LvZhaojun Ding
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Jan 13, 2021·Cold Spring Harbor Perspectives in Biology·Jorge J Casal, José M Estevez
Apr 4, 2021·International Journal of Molecular Sciences·Anna CiarkowskaAnna Kozakiewicz
Jun 4, 2021·Journal of Experimental Botany·Christian Danve M Castroverde, Damaris Dina
Jul 22, 2021·The New Phytologist·Eduardo Mateo-BonmatíKarin Ljung
Aug 23, 2021·Molecular Plant Pathology·Maximilian MüllenderSebastian Liebe
Sep 5, 2021·Physiologia Plantarum·Bhuwaneshwar Sharan MishraAshverya Laxmi
Apr 28, 2021·Cold Spring Harbor Perspectives in Biology·Yanfei MaJan U Lohmann

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