Ingle, Robert A., Stoker, Claire, Stone, Wendy, Adams, Nicolette, Smith, Rob, Grant, Murray, Carré, Isabelle, Roden, Laura C. and Denby, Katherine J. (2015) Jasmonate signalling drives time-of-day differences in susceptibility of Arabidopsis to the fungal pathogen Botrytis cinerea. The Plant Journal, 84 . pp. 937-948. doi:10.1111/tpj.13050 ISSN 0960-7412.

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Abstract

The circadian clock, an internal timekeeping mechanism, allows plants to anticipate regular changes in the environment, such as light and dark, and biotic challenges such as pathogens and herbivores. Here, we demonstrate that the plant circadian clock influences susceptibility to the necrotrophic fungal pathogen, Botrytis cinerea. Arabidopsis plants show differential susceptibility to B. cinerea depending on the time of day of inoculation. Decreased susceptibility after inoculation at dawn compared to night persists under constant light conditions and is disrupted in dysfunctional clock mutants, demonstrating the role of the plant clock in driving time-of-day susceptibility to B. cinerea. The decreased susceptibility to B. cinerea following inoculation at subjective dawn was associated with faster transcriptional reprogramming of the defence response with gating of infection-responsive genes apparent. Direct target genes of core clock regulators were enriched among the transcription factors that responded more rapidly to infection at subjective dawn than subjective night, suggesting an influence of the clock on the defence-signalling network. In addition, jasmonate signalling plays a crucial role in the rhythmic susceptibility of Arabidopsis to B. cinerea with the enhanced susceptibility to this pathogen at subjective night lost in a jaz6 mutant.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Journal or Publication Title:	The Plant Journal
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0960-7412
Official Date:	21 November 2015
Dates:	Date Event 21 November 2015 Published 15 October 2015 Available 2 October 2015 Accepted 20 July 2015 Submitted
Volume:	84
Page Range:	pp. 937-948
DOI:	10.1111/tpj.13050
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	19 December 2015
Date of first compliant Open Access:	23 March 2016

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