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Chloroplasts play a central role in facilitating MAMP‐triggered immunity, pathogen suppression of immunity and crosstalk with abiotic stress
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Breen, Susan, Hussain, Rana Muhammad Fraz, Breeze, Emily, Brown, Hannah, Alzwiy, Ibrahim, Abdelsayed, Sara, Gaikwad, Trupti and Grant, Murray (2022) Chloroplasts play a central role in facilitating MAMP‐triggered immunity, pathogen suppression of immunity and crosstalk with abiotic stress. Plant, Cell & Environment, 45 (10). pp. 3001-3017. doi:10.1111/pce.14408 ISSN 0140-7791.
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Official URL: https://doi.org/10.1111/pce.14408
Abstract
Microbe‐associated molecular pattern (MAMP)‐triggered immunity (MTI) research has traditionally centred around signal transduction pathways originating from activated membrane‐localized pattern recognition receptors (PRRs), culminating in nuclear transcription and posttranslational modifications. More recently, chloroplasts have emerged as key immune signalling hubs, playing a central role in integrating environmental signals. Notably, MAMP recognition induces chloroplastic reactive oxygen species (cROS) that is suppressed by pathogen effectors, which also modify the balance of chloroplast‐synthesized precursors of the defence hormones, jasmonic acid, salicylic acid (SA) and abscisic acid. This study focuses on how well‐characterized PRRs and coreceptors modulate chloroplast physiology, examining whether diverse signalling pathways converge to similarly modulate chloroplast function. Pretreatment 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 maximum dark‐adapted quantum efficiency (the ratio of variable/maximum fluorescence [Fv/Fm]). The MTI coreceptor 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 even moderate changes in light intensity can uncouple plant immune signalling.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QK Botany S Agriculture > SB Plant culture |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
| SWORD Depositor: | Library Publications Router | ||||||||
| Library of Congress Subject Headings (LCSH): | Chlorophyll -- Synthesis, Chloroplasts , Chloroplasts -- Formation -- Regulation , Plant cellular signal transduction , Plant immunology | ||||||||
| Journal or Publication Title: | Plant, Cell & Environment | ||||||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||
| ISSN: | 0140-7791 | ||||||||
| Official Date: | October 2022 | ||||||||
| Dates: |
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| Volume: | 45 | ||||||||
| Number: | 10 | ||||||||
| Page Range: | pp. 3001-3017 | ||||||||
| DOI: | 10.1111/pce.14408 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Copyright Holders: | © 2022 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd. | ||||||||
| Date of first compliant deposit: | 18 August 2022 | ||||||||
| Date of first compliant Open Access: | 18 August 2022 | ||||||||
| RIOXX Funder/Project Grant: |
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