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The chloroplast plays a central role in facilitating MAMP-Triggered Immunity, pathogen suppression of immunity and crosstalk with abiotic stress.
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  • Susan Breen,
  • R. Muhammad Fraz Hussain,
  • Emily Breeze,
  • Hannah Brown,
  • Ibrahim Alzwiy,
  • Sara Abdelsayed,
  • Trupti Gaikwad,
  • Murray Grant
Susan Breen
University of Warwick School of Life Sciences

Corresponding Author:susan.breen@hutton.ac.uk

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R. Muhammad Fraz Hussain
University of Warwick School of Life Sciences
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Emily Breeze
University of Warwick School of Life Sciences
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Hannah Brown
United Kingdom Department of Health and Social Care
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Ibrahim Alzwiy
University of Exeter College of Life and Environmental Sciences
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Sara Abdelsayed
University of Warwick School of Life Sciences
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Trupti Gaikwad
University of Exeter College of Life and Environmental Sciences
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Murray Grant
University of Warwick School of Life Sciences
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Abstract

Microbe associated molecular pattern (MAMP) triggered immunity research has traditionally centred around signal transduction pathways originating from activated membrane localised pattern recognition receptors (PRRs), culminating in nuclear transcription and post translational modifications. More recently, chloroplasts have emerged as key immune signalling hubs. Chloroplasts play a central role in integrating environmental signals. Notably MAMP recognition induces chloroplastic ROS (cROS) which is suppressed by pathogens effectors, which also modify the balance of defence hormone precursors, jasmonic acid (JA), salicylic acid (SA) and abscisic acid (ABA), whose precursors are chloroplast synthesised. This study focuses on how well characterised PRRs and co-receptors modulate chloroplast physiology, examining whether diverse signalling pathways converge to similarly modulate chloroplast function. Pre-treatment of receptor mutant plants with MAMP and D(Damage)AMP peptides usually protect against effector modulation of chlorophyll fluorescence and prevent Pseudomonas syringae effector mediated quenching of cROS and suppression of Fv/Fm. The MAMP-triggered immunity (MTI) co-receptor double mutant, bak1-5/bkk1-1, exhibits a remarkable decrease in Fv/Fm compared to control plants during infection, underlining the importance of MTI mediated signalling in chloroplast immunity. Further probing the role of the chloroplast in immunity we unexpectedly found that high light uncouples plant immune signalling.
01 Jun 2022Submitted to Plant, Cell & Environment
01 Jun 2022Submission Checks Completed
01 Jun 2022Assigned to Editor
07 Jun 2022Reviewer(s) Assigned
30 Jun 2022Review(s) Completed, Editorial Evaluation Pending
01 Jul 2022Editorial Decision: Revise Minor
22 Jul 20221st Revision Received
22 Jul 2022Submission Checks Completed
22 Jul 2022Assigned to Editor
24 Jul 2022Review(s) Completed, Editorial Evaluation Pending
24 Jul 2022Editorial Decision: Accept
Oct 2022Published in Plant, Cell & Environment volume 45 issue 10 on pages 3001-3017. 10.1111/pce.14408