Lettuce immune responses and apoplastic metabolite profile contribute to reduced internal leaf colonization by human bacterial pathogens

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dc.article.number635
dc.catalogadorpva
dc.contributor.authorJacob, Cristián
dc.contributor.authorMelotto, Maeli
dc.date.accessioned2025-05-28T16:33:13Z
dc.date.available2025-05-28T16:33:13Z
dc.date.issued2025
dc.date.updated2025-05-18T00:03:04Z
dc.description.abstractBackground Human bacterial pathogens such as Salmonella enterica and Escherichia coli can colonize the apoplast of leafy greens, where they may evade standard sanitization measures and persist until produce consumption. Bacterial survival in this niche is influenced by plant immune responses that may vary according to bacterial species and plant genotypes. The variability in immune responses has been associated with differences in pathogen persistence capacity within the phyllosphere. In addition, emerging evidence suggests that preexisting and inducible plant metabolites contribute to either restricting or facilitating colonization of human pathogens in plant tissues. Identifying the molecular mechanisms underlying these interactions is crucial for developing strategies to mitigate contamination in fresh produce. Results We characterized whole-leaf transcriptome and apoplast metabolome profiles of three lettuce cultivars upon exposure to the human pathogenic bacteria S. enterica ser. Typhimurium 14028s and E. coli O157:H7. The lettuce genotypes Lollo Rossa and Green Towers exhibited stronger transcriptional modulation, primarily associated with defense-related processes and showed reduced bacterial survival in their apoplast. Surprisingly, Green Towers did not generate callose deposition or reactive oxygen species burst responses at levels comparable to that of Lollo Rossa, suggesting it has distinct modifications in the apoplastic conditions that restrict pathogen persistence. Apoplastic metabolomic profiling revealed specific compounds alterations in Green Towers linked to bacterial survival, indicating their potential role in this genotype’s defense mechanism. In contrast, the lettuce cultivar Red Tide exhibited minimal transcriptional and metabolic modulation, lack of robust defense activation, which was accompanied by apoplastic bacterial survival. Conclusions This study provides evidence that lettuce cultivars exhibit distinct molecular responses that may influence the persistence of human bacterial pathogens in the leaf apoplast. The results indicate that both immune response activation and metabolite composition may contribute to restrict apoplastic bacterial persistence or growth. These findings offer novel insights into the genetic and biochemical factors shaping lettuce-pathogen interactions, which might inform breeding programs and agronomic practices aimed at enhancing food safety.
dc.fechaingreso.objetodigital2025-05-18
dc.format.extent16 páginas
dc.fuente.origenBiomed Central
dc.identifier.citationBMC Plant Biology. 2025 May 14;25(1):635
dc.identifier.doi10.1186/s12870-025-06636-1
dc.identifier.urihttps://doi.org/10.1186/s12870-025-06636-1
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/104505
dc.information.autorucFacultad de Agronomía e Ingenieria Forestal; Jacob, Cristián; S/I; 163407
dc.issue.numero1
dc.language.isoen
dc.nota.accesocontenido completo
dc.publisherSpringer Nature
dc.revistaBMC Plant Biology
dc.rightsacceso abierto
dc.rights.holderThe Author(s)
dc.rights.licenseAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectFood safety
dc.subjectFresh produce
dc.subjectPlant-microbe interaction
dc.subjectSalmonella enterica
dc.subjectEscherichia coli
dc.subjectLeaf Apoplast
dc.subjectPlant defense
dc.subjectOmics
dc.subject.ddc570
dc.subject.deweyBiologíaes_ES
dc.subject.ods02 Zero hunger
dc.subject.ods14 Life below water
dc.subject.odspa02 Hambre cero
dc.subject.odspa14 Vida submarina
dc.titleLettuce immune responses and apoplastic metabolite profile contribute to reduced internal leaf colonization by human bacterial pathogens
dc.typeartículo
dc.volumen25
sipa.codpersvinculados163407
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