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The plant pathogen Pseudomonas aeruginosa triggers a DELLA-dependent seed germination arrest in Arabidopsis

Shanmugabalaji, Venkatasalam
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Published in eLife. 2018, vol. 7
Abstract To anticipate potential seedling damage, plants block seed germination under unfavorable conditions. Previous studies investigated how seed germination is controlled in response to abiotic stresses through gibberellic and abscisic acid signaling. However, little is known about whether seeds respond to rhizosphere bacterial pathogens. We found that Arabidopsis seed germination is blocked in the vicinity of the plant pathogen Pseudomonas aeruginosa. We identified L-2-amino-4-methoxy-trans-3-butenoic acid (AMB), released by P. aeruginosa, as a biotic compound triggering germination arrest. We provide genetic evidence that in AMB-treated seeds DELLA factors promote the accumulation of the germination repressor ABI5 in a GA-independent manner. AMB production is controlled by the quorum sensing system IQS. In vitro experiments show that the AMB-dependent germination arrest protects seedlings from damage induced by AMB. We discuss the possibility that this could serve as a protective response to avoid severe seedling damage induced by AMB and exposure to a pathogen.
Keywords Abscisic Acid/metabolismAminobutyrates/pharmacologyAntibody SpecificityArabidopsis/drug effects/embryology/genetics/microbiologyArabidopsis Proteins/metabolismDiscriminant AnalysisGene Expression RegulationPlant/drug effectsGermination/drug effectsGibberellins/pharmacologyGlycine/analogs & derivatives/pharmacologyLeast-Squares AnalysisMetabolomicsPseudomonas aeruginosa/physiologySeeds/drug effects/embryologySignal Transduction/drug effectsTriazoles/pharmacology
PMID: 30149837
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Article (Published version) (4.9 MB) - public document Free access
Research groups Groupe Lopez-Molina
Phytochimie et produits naturels bioactifs
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CHAHTANE, Hicham et al. The plant pathogen Pseudomonas aeruginosa triggers a DELLA-dependent seed germination arrest in Arabidopsis. In: eLife, 2018, vol. 7. doi: 10.7554/eLife.37082 https://archive-ouverte.unige.ch/unige:136483

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Deposited on : 2020-06-05

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