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- W2235512896 abstract "Microbe associated molecular pattern (MAMP) receptors in plants recognize MAMPs and activate basal defences; however a complete understanding of the molecular and physiological mechanisms conferring immunity remains elusive. Pathogens suppress active defence in plants through the combined action of effector proteins. Here we show that the chloroplast is a key component of early immune responses. MAMP perception triggers the rapid, large-scale suppression of nuclear encoded chloroplast-targeted genes (NECGs). Virulent Pseudomonas syringae effectors reprogramme NECG expression in Arabidopsis, target the chloroplast and inhibit photosynthetic CO2 assimilation through disruption of photosystem II. This activity prevents a chloroplastic reactive oxygen burst. These physiological changes precede bacterial multiplication and coincide with pathogen-induced abscisic acid (ABA) accumulation. MAMP pretreatment protects chloroplasts from effector manipulation, whereas application of ABA or the inhibitor of photosynthetic electron transport, DCMU, abolishes the MAMP-induced chloroplastic reactive oxygen burst, and enhances growth of a P. syringae hrpA mutant that fails to secrete effectors. Innate immunity is the first layer of defence in plants. However, pathogens inject effectors that supress this mechanism. Here the authors show that photosynthesis is a key component of plant defence, and that chloroplasts are targeted by pathogens." @default.
- W2235512896 created "2016-06-24" @default.
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- W2235512896 date "2015-06-01" @default.
- W2235512896 modified "2023-10-18" @default.
- W2235512896 title "Chloroplasts play a central role in plant defence and are targeted by pathogen effectors" @default.
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- W2235512896 doi "https://doi.org/10.1038/nplants.2015.74" @default.
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