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A salicylic acid-associated plant-microbe interaction attracts beneficial Flavobacterium sp. to the Arabidopsis thaliana phyllosphere.
Physiol. Plant. 176:e14483 (2024)
Both above- and below-ground parts of plants are constantly challenged with microbes and interact closely with them. Many plant-growth-promoting rhizobacteria, mostly interacting with the plant's root system, enhance the immunity of plants in a process described as induced systemic resistance (ISR). Here, we characterized local induced resistance (IR) triggered by the model PGPR Pseudomonas simiae WCS417r (WCS417) in Arabidopsis thaliana. Hydroponic application of WCS417 to Arabidopsis roots resulted in propagation of WCS417 in/on leaves and the establishment of local IR. WCS417-triggered local IR was dependent on salicylic acid (SA) biosynthesis and signalling and on functional biosynthesis of pipecolic acid and monoterpenes, which are classically associated with systemic acquired resistance (SAR). WCS417-triggered local IR was further associated with a priming of gene expression changes related to SA signalling and SAR. A metabarcoding approach applied to the leaf microbiome revealed a significant local IR-associated enrichment of Flavobacterium sp.. Co-inoculation experiments using WCS417 and At-LSPHERE Flavobacterium sp. Leaf82 suggest that the proliferation of these bacteria is influenced by both microbial and immunity-related, plant-derived factors. Furthermore, application of Flavobacterium Leaf82 to Arabidopsis leaves induced SAR in an NPR1-dependent manner, suggesting that recruitment of this bacterium to the phyllosphere resulted in propagation of IR. Together, the data highlight the importance of plant-microbe-microbe interactions in the phyllosphere and reveal Flavobacterium sp. Leaf82 as a new beneficial promoter of plant health.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Induced Systemic Resistance; N-hydroxypipecolic Acid; Hydroxy-pipecolic Acid; Acquired-resistance; Species-diversity; Leaf Microbiota; Defense; Jasmonate; Npr1; Biosynthesis
ISSN (print) / ISBN
0031-9317
e-ISSN
1399-3054
Journal
Physiologia Plantarum
Quellenangaben
Volume: 176,
Issue: 4,
Article Number: e14483
Publisher
Wiley
Publishing Place
111 River St, Hoboken 07030-5774, Nj Usa
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Biochemical Plant Pathology (BIOP)
Research Unit Comparative Microbiome Analysis (COMI)
Research Unit Comparative Microbiome Analysis (COMI)
Grants
Deutsche Forschungsgemeinschaft