Genetic interactions between ABA signalling and the Arg/N-end rule pathway during Arabidopsis seedling establishment

A - Papers appearing in refereed journals

Zhang, H., Gannon, L., Jones, P. D., Rundle, C. A., Hassall, K. L., Gibbs, D. J., Holdsworth, M. J. and Theodoulou, F. L. 2018. Genetic interactions between ABA signalling and the Arg/N-end rule pathway during Arabidopsis seedling establishment. Scientific Reports. 8, p. 15192. https://doi.org/10.1038/s41598-018-33630-5

AuthorsZhang, H., Gannon, L., Jones, P. D., Rundle, C. A., Hassall, K. L., Gibbs, D. J., Holdsworth, M. J. and Theodoulou, F. L.
Abstract

The Arg/N-end rule pathway of ubiquitin-mediated proteolysis has multiple functions throughout plant development, notably in the transition from dormant seed to photoautotrophic seedling. PROTEOLYSIS6 (PRT6), an N-recognin E3 ligase of the Arg/N-end rule regulates the degradation of transcription factor substrates belonging to Group VII of the Ethylene Response Factor superfamily (ERFVIIs). It is not known whether ERFVIIs are associated with all known functions of the Arg/N-end rule, and the downstream pathways influenced by ERFVIIs are not fully defined. Here, we examined the relationship between PRT6 function, ERFVIIs and ABA signalling in Arabidopsis seedling establishment. Physiological analysis of seedlings revealed that N-end rule-regulated stabilisation of three of the five ERFVIIs, RAP2.12, RAP2.2 and RAP2.3, controls sugar sensitivity of seedling establishment and oil body breakdown following germination. ABA signalling components ABA INSENSITIVE (ABI)4 as well as ABI3 and ABI5 were found to enhance ABA sensitivity of germination and sugar sensitivity of establishment in a background containing stabilised ERFVIIs. However, N-end rule regulation of oil bodies was not dependent on canonical ABA signalling. We propose that the N-end rule serves to control multiple aspects of the seed to seedling transition by regulation of ERFVII activity, involving both ABA-dependent and independent signalling pathways.

Keywordsplant signalling; proteolysis
Year of Publication2018
JournalScientific Reports
Journal citation8, p. 15192
Digital Object Identifier (DOI)https://doi.org/10.1038/s41598-018-33630-5
PubMed ID30315202
PubMed Central IDPMC6185960
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeTPM - Tailoring Plant Metabolism - Work package 1 (WP1) - High value lipids for health and industry
Publisher's version
Output statusPublished
Publication dates
Online12 Oct 2018
Publication process dates
Accepted01 Oct 2018
PublisherNature Publishing Group
Copyright licenseCC BY
ISSN2045-2322

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