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

ELife
Hicham ChahtaneL Lopez-Molina

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.

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Citations

Jun 5, 2020·Plants·Gerardo Carrera-CastañoLuis Oñate-Sánchez
Aug 15, 2020·Environmental Microbiology·María Victoria Berlanga-ClaveroDiego Romero
Nov 2, 2019·MicrobiologyOpen·Pierre Cornelis
Dec 24, 2020·Innate Immunity·Jamie CookZhenyu Cheng
Apr 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Inhye LeeMoon-Soo Soh
Jun 9, 2021·MSystems·Aude RochefortAlain Sarniguet

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Datasets Mentioned

BETA
GSE115272

Methods Mentioned

BETA
RNAseq
transgenic
PCA
nuclear magnetic resonance
NMR

Software Mentioned

Java
Cuffdiff
Gene Cluster
DA
TopHat
Treeview
OPLS

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