Bacterial networks and co-occurrence relationships in the lettuce root microbiota

Massimiliano Cardinale, Armin Erlacher, Martin Grube, Gabriele Berg

Research output: Contribution to journalArticlepeer-review


Lettuce is one of the most common raw foods worldwide, but occasionally also involved in pathogen outbreaks. To understand the correlative structure of the bacterial community as a network, we studied root microbiota of eight ancient and modern Lactuca sativa cultivars and the wild ancestor Lactuca serriola by pyrosequencing of 16S rRNA gene amplicon libraries. The lettuce microbiota was dominated by Proteobacteria and Bacteriodetes, as well as abundant Chloroflexi and Actinobacteria. Cultivar specificity comprised 12.5% of the species. Diversity indices were not different between lettuce cultivar groups but higher than in L. serriola, suggesting that domestication lead to bacterial diversification in lettuce root system. Spearman correlations between operational taxonomic units (OTUs) showed that co‐occurrence prevailed over co‐exclusion, and complementary fluorescence in situ hybridization‐confocal …
Original languageEnglish
Pages (from-to)239-252
JournalEnvironmental Microbiology
Publication statusPublished - 2015

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  • Sonstiges


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