The PRT6 N-degron pathway restricts VERNALIZATION 2 to endogenous hypoxic niches to modulate plant development

The PRT6 N-degron pathway restricts VERNALIZATION 2 to endogenous hypoxic niches to modulate plant development

© 2020 The Authors New Phytologist © 2020 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 229(2021), 1 vom: 10. Jan., Seite 126-139
1. Verfasser: Labandera, Anne-Marie (VerfasserIn)
Weitere Verfasser: Tedds, Hannah M, Bailey, Mark, Sprigg, Colleen, Etherington, Ross D, Akintewe, Olunwatunmise, Kalleechurn, Geetika, Holdsworth, Michael J, Gibbs, Daniel J
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't N-degron pathway PRC2 flowering time hypoxia polycomb proteolysis root vernalization mehr... Arabidopsis Proteins DNA-Binding Proteins VRN2 protein, Arabidopsis PRT6 protein, Arabidopsis EC 2.3.2.27 Ubiquitin-Protein Ligases
Beschreibung
Zusammenfassung:© 2020 The Authors New Phytologist © 2020 New Phytologist Foundation.
VERNALIZATION2 (VRN2), an angiosperm-specific subunit of the polycomb repressive complex 2 (PRC2), is an oxygen (O2 )-regulated target of the PCO branch of the PRT6 N-degron pathway of ubiquitin-mediated proteolysis. How this post-translational regulation coordinates VRN2 activity remains to be fully established. Here we use Arabidopsis thaliana ecotypes, mutants and transgenic lines to determine how control of VRN2 stability contributes to its functions during plant development. VRN2 localizes to endogenous hypoxic regions in aerial and root tissues. In the shoot apex, VRN2 differentially modulates flowering time dependent on photoperiod, whilst its presence in lateral root primordia and the root apical meristem negatively regulates root system architecture. Ectopic accumulation of VRN2 does not enhance its effects on flowering, but does potentiate its repressive effects on root growth. In late-flowering vernalization-dependent ecotypes, VRN2 is only active outside meristems when its proteolysis is inhibited in response to cold exposure, as its function requires concomitant cold-triggered increases in other PRC2 subunits and cofactors. We conclude that the O2 -sensitive N-degron of VRN2 has a dual function, confining VRN2 to meristems and primordia, where it has specific developmental roles, whilst also permitting broad accumulation outside of meristems in response to environmental cues, leading to other functions
Beschreibung:Date Completed 14.05.2021
Date Revised 31.05.2022
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.16477