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A Molecular Framework for the Control of Adventitious Rooting by TIR1/AFB2-Aux/IAA-Dependent Auxin Signaling in Arabidopsis
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
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2019 (engelsk)Inngår i: Molecular Plant, ISSN 1674-2052, E-ISSN 1752-9867, Vol. 12, nr 11, s. 1499-1514Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
Elsevier, 2019. Vol. 12, nr 11, s. 1499-1514
Emneord [en]
Arabidopsis, AuxIAA, TIR1/AFB, adventitious roots, jasmonate
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-164949DOI: 10.1016/j.molp.2019.09.001ISI: 000494946400011PubMedID: 31520787OAI: oai:DiVA.org:umu-164949DiVA, id: diva2:1367961
Forskningsfinansiär
Swedish Research CouncilVinnovaKnut and Alice Wallenberg FoundationCarl Tryggers foundation The Kempe FoundationsTilgjengelig fra: 2019-11-05 Laget: 2019-11-05 Sist oppdatert: 2019-11-26bibliografisk kontrollert
Inngår i avhandling
1. A molecular network mediating adventitious root initiation in Arabidopsis thaliana
Åpne denne publikasjonen i ny fane eller vindu >>A molecular network mediating adventitious root initiation in Arabidopsis thaliana
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Umeå: Umeå universitet, 2019. s. 52
Emneord
Adventitious rooting, auxin, jasmonate, cytokinin, phytohormone perception and signalling, vegetative propagation
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-164953 (URN)978-91-7855-138-5 (ISBN)
Disputas
2019-11-28, KB.E3.01 (Lilla hörsalen), KBC-huset, Umeå universitet, Umeå, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-11-07 Laget: 2019-11-05 Sist oppdatert: 2019-11-14bibliografisk kontrollert

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