Journal
MOLECULAR PLANT
Volume 12, Issue 11, Pages 1499-1514Publisher
CELL PRESS
DOI: 10.1016/j.molp.2019.09.001
Keywords
TIR1/AFB; AuxIAA; jasmonate; adventitious roots; Arabidopsis
Categories
Funding
- Swedish Research Council (VR)
- Swedish Research Council for Research and Innovation for Sustainable Growth (VINNOVA)
- K. & A. Wallenberg Foundation
- Carl Trygger Foundation
- Carl Kempe Foundation
- University of Picardie Jules Verne
- Regional Council of Picardie
- European Regional Development Fund
- Ministry of Education, Youth and Sports of the Czech Republic (European Regional Development Fund-Project Plants as a tool for sustainable global development'') [CZ.02.1.01/0.0/0.0/16_019/0000827]
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In Arabidopsis thaliana, canonical auxin-dependent gene regulation is mediated by 23 transcription factors from the AUXIN RESPONSE FACTOR (ARF) family that interact with auxin/indole acetic acid repressors (Aux/IAAs), which themselves form co-receptor complexes with one of six TRANSPORT INHIBITOR1/AUXIN-SIGNALLING F-BOX (TIR1/AFB) proteins. Different combinations of co-receptors drive specific sensing outputs, allowing auxin to control a myriad of processes. ARF6 and ARF8 are positive regulators of adventitious root initiation upstream of jasmonate, but the exact auxin co-receptor complexes controlling the transcriptional activity of these proteins has remained unknown. Here, using loss-of-function mutants we show that three Aux/IAA genes, IAA6, IAA9, and IAA17, act additively in the control of adventitious root (AR) initiation. These three IAA proteins interact with ARF6 and/or ARF8 and likely repress their activity in AR development. We show that TIR1 and AFB2 are positive regulators of AR formation and TIR1 plays a dual role in the control of jasmonic acid (JA) biosynthesis and conjugation, as several JA biosynthesis genes are up-regulated in the tir1-1 mutant. These results lead us to propose that in the presence of auxin, TIR1 and AFB2 form specific sensing complexes with IAA6, IAA9, and/or IAA17 to modulate JA homeostasis and control AR initiation.
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