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Enhanced waterlogging tolerance in barley by manipulation of expression of the N-end rule pathway E3 ligase PROTEOLYSIS6

Mendiondo, Guillermina M.; Gibbs, Daniel J.; Szurman-Zubrzycka, Miriam; Korn, Arnd; Marquez, Julietta; Szarejko, Iwona; Maluszynski, Miroslaw; King, John; Axcell, Barry; Smart, Katherine; Corbineau, Francoise; Holdsworth, Michael J.

Authors

Daniel J. Gibbs

Miriam Szurman-Zubrzycka

Arnd Korn

Julietta Marquez

Iwona Szarejko

Miroslaw Maluszynski

JOHN KING john.king@nottingham.ac.uk
Professor of Theoretical Mechanics

Barry Axcell

Katherine Smart

Francoise Corbineau



Abstract

Increased tolerance of crops to low oxygen (hypoxia) during flooding is a key target for food security. In Arabidopsis thaliana (L.) Heynh., the N-end rule pathway of targeted proteolysis controls plant responses to hypoxia by regulating the stability of group VII ethylene response factor (ERFVII) transcription factors, controlled by the oxidation status of amino terminal (Nt)-cysteine (Cys). Here, we show that the barley (Hordeum vulgare L.) ERFVII BERF1 is a substrate of the N-end rule pathway in vitro. Furthermore, we show that Nt-Cys acts as a sensor for hypoxia in vivo, as the stability of the oxygen-sensor reporter protein MCGGAIL-GUS increased in waterlogged transgenic plants. Transgenic RNAi barley plants, with reduced expression of the N-end rule pathway N-recognin E3 ligase PROTEOLYSIS6 (HvPRT6), showed increased expression of hypoxia-associated genes and altered seed germination phenotypes. In addition, in response to waterlogging, transgenic plants showed sustained biomass, enhanced yield, retention of chlorophyll, and enhanced induction of hypoxia-related genes. HvPRT6 RNAi plants also showed reduced chlorophyll degradation in response to continued darkness, often associated with waterlogged conditions. Barley Targeting Induced Local Lesions IN Genomes (TILLING) lines, containing mutant alleles of HvPRT6, also showed increased expression of hypoxia-related genes and phenotypes similar to RNAi lines. We conclude that the N-end rule pathway represents an important target for plant breeding to enhance tolerance to waterlogging in barley and other cereals.

Journal Article Type Article
Publication Date Feb 6, 2015
Journal Plant Biotechnology Journal
Print ISSN 1467-7644
Electronic ISSN 1467-7652
Publisher Wiley
Peer Reviewed Peer Reviewed
APA6 Citation Mendiondo, G. M., Gibbs, D. J., Szurman-Zubrzycka, M., Korn, A., Marquez, J., Szarejko, I., …Holdsworth, M. J. (2015). Enhanced waterlogging tolerance in barley by manipulation of expression of the N-end rule pathway E3 ligase PROTEOLYSIS6. Plant Biotechnology Journal, doi:10.1111/pbi.12334
DOI https://doi.org/10.1111/pbi.12334
Keywords N-end rule; waterlogging; targeted proteolysis; ERFVIIs; PRT6
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/pbi.12334/abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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