The Asymmetric Expression of SAUR Genes Mediated by ARF7/19 Promotes the Gravitropism and Phototropism of Plant Hypocotyls.
ARF
ARF7
Arabidopsis
SAUR
SAUR19
asymmetric
auxin
gravitropism
phototropism
soybean
Journal
Cell reports
ISSN: 2211-1247
Titre abrégé: Cell Rep
Pays: United States
ID NLM: 101573691
Informations de publication
Date de publication:
21 04 2020
21 04 2020
Historique:
received:
26
06
2019
revised:
21
01
2020
accepted:
27
03
2020
entrez:
23
4
2020
pubmed:
23
4
2020
medline:
15
5
2021
Statut:
ppublish
Résumé
The asymmetric distribution of auxin leads to the bending growth of hypocotyls during gravitropic and phototropic responses, but the signaling events downstream of auxin remain unclear. Here, we identify many SAUR genes showing asymmetric expression in soybean hypocotyls during gravistimulation and then study their homologs in Arabidopsis. SAUR19 subfamily genes have asymmetric expression in Arabidopsis hypocotyls during gravitropic and phototropic responses, induced by the lateral redistribution of auxin. Both the mutation of SAUR19 subfamily genes and the ectopic expression of SAUR19 weaken these tropic responses, indicating the critical role of their asymmetric expression. The auxin-responsive transcription factor ARF7 may directly bind the SAUR19 promoter and activate SAUR19 expression asymmetrically in tropic responses. Taken together, our results reveal that a gravity- or light-triggered asymmetric auxin distribution induces the asymmetric expression of SAUR19 subfamily genes by ARF7 and ARF19 in the hypocotyls, which leads to bending growth during gravitropic and phototropic responses.
Identifiants
pubmed: 32320660
pii: S2211-1247(20)30429-0
doi: 10.1016/j.celrep.2020.107529
pii:
doi:
Substances chimiques
ARF19 protein, Arabidopsis
0
ARF7 protein, Arabidopsis
0
Arabidopsis Proteins
0
SAUR19 protein, Arabidopsis
0
Soybean Proteins
0
Transcription Factors
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
107529Informations de copyright
Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of Interests The authors declare no competing interests.