The plant pathogen Pseudomonas aeruginosa triggers a DELLA-dependent seed germination arrest in Arabidopsis
Year: 2018
Type: article
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.
Source: eLife
DOI: 10.7554/elife.37082
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $2,529
Awards: NMR 600MHz for metabolomics and biomarker identification for life sciences, chemical biology and medical projects at the University of Geneva, G4060900387, Localisation and dynamics of free and bound 12-oxo-phytodienoic acid (OPDA) pools in Arabidopsis, Selected topics on the control of seed germination: light, temperature and dormancy, G8068435768, Study of leaf endophytic fungi: Exploration and valorization of biosourCed Innovative antibacterial metaboLites
OpenAlex ID: W2889523774