Natural variation and drought-induced differences in metabolite profiles of red oak-leaf and Romaine lettuce play a role in modulating the interaction with Salmonella enterica

Nutrients on produce surfaces are vital for successful enteric pathogen colonisation. In this study, we investigated natural variation in metabolite profiles of Romaine ‘Parris Island Cos’ and red oak-leaf lettuce ‘Mascara’ under regular and restricted watering conditions. We also investigated the i...

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Bibliographic Details
Published in:International journal of food microbiology 2023-01, Vol.385, p.109998, Article 109998
Main Authors: Liu, Xingchen, Li, Yue, Micallef, Shirley A.
Format: Article
Language:English
Subjects:
Abiotic elicitation
Anthocyanins
Colony Count, Microbial
Droughts
Flavonoids
Food Microbiology
Food safety
Human pathogen on plants
Lactuca
Plant Leaves
Quercus
Regulated drought stress
Salmonella enterica
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Summary:Nutrients on produce surfaces are vital for successful enteric pathogen colonisation. In this study, we investigated natural variation in metabolite profiles of Romaine ‘Parris Island Cos’ and red oak-leaf lettuce ‘Mascara’ under regular and restricted watering conditions. We also investigated the impact of plant drought stress on the Salmonella – lettuce association. Salmonella Newport and Typhimurium were able to persist at higher levels on regularly watered Romaine than red oak-leaf lettuce. Drought treatment to lettuce impaired epiphytic Salmonella association, with S. Newport and Typhimurium being differentially affected. A higher log reduction of both serotypes was measured on drought-subjected red oak-leaf lettuce plants than controls, but S. Typhimurium was unaffected on water deficit-treated Romaine lettuce (p 
ISSN:0168-1605
1879-3460
DOI:10.1016/j.ijfoodmicro.2022.109998