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Bacterial communities associated with surfaces of leafy greens: shift in composition and decrease in richness over

Merete Wiken Dees1, Erik Lysøe2, Berit Nordskog2

  • 1Bioforsk-Norwegian Institute for Agricultural and Environmental Research, Ås, Norway plhmwd@bioforsk.no.

Applied and Environmental Microbiology
|December 21, 2014
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Summary
This summary is machine-generated.

Bacterial communities on leafy greens like lettuce and rocket salad change as plants mature, with richness decreasing over time. Seasonality also influences these leaf-dwelling microbes, not just plant age.

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Area of Science:

  • Microbiology
  • Plant Science
  • Ecology

Background:

  • The phyllosphere, the area on plant leaves colonized by microorganisms, hosts diverse bacteria and fungi.
  • Understanding the dynamics of bacterial communities on leafy greens is crucial due to their potential role in plant health and human pathogen transmission.

Purpose of the Study:

  • To investigate how bacterial community composition in the phyllosphere of rocket salad (Diplotaxis tenuifolia) and lettuce (Lactuca sativa) changes over time.
  • To determine the influence of plant development stage and seasonality on these microbial communities.

Main Methods:

  • Profiling bacterial communities from two plantings of rocket salad and three plantings of lettuce at two Norwegian farms.
  • Utilizing an Illumina MiSeq-based sequencing approach to analyze microbial composition.

Main Results:

  • Bacterial richness in lettuce (Lactuca sativa) was significantly higher at 3 weeks post-planting compared to harvest (5-7 weeks) in most plantings.
  • Bacterial diversity in lettuce remained consistent for one planting, suggesting seasonal influences on colonization.
  • Distinct phyllosphere communities were observed between rocket salad and lettuce at harvest, indicating host-specific interactions.

Conclusions:

  • Bacterial community composition on leafy greens is influenced by both plant development and seasonal factors.
  • Leaf-dwelling bacteria are not passive; host plants actively shape microbial niches, leading to species-specific community structures.
  • This study enhances understanding of host plant-microbe interactions and temporal dynamics in phyllosphere ecology.