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Microbial phyllosphere populations are more complex than previously realized.

C H Yang1, D E Crowley, J Borneman

  • 1Department of Plant Pathology, University of California, Riverside, CA 92521, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 29, 2001
PubMed
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Phyllosphere microbial communities on plant leaves are unique to each species. Culture-independent methods revealed novel bacteria and fungi, highlighting the complexity of the phyllosphere microbiome.

Area of Science:

  • Microbiology
  • Plant Science
  • Ecology

Background:

  • The phyllosphere, the area on plant surfaces inhabited by microorganisms, plays a crucial role in plant health and ecosystem function.
  • Conventional culture-based methods often underestimate the diversity of microbial communities due to the inability to culture many microorganisms.

Purpose of the Study:

  • To characterize the phyllosphere microbial communities of field-grown plant species using both culture-dependent and -independent approaches.
  • To identify bacterial and fungal species inhabiting the phyllosphere of Citrus sinensis (cv. Valencia).

Main Methods:

  • Denaturing Gradient Gel Electrophoresis (DGGE) with 16S ribosomal DNA (rDNA) primers for community structure analysis.
  • Cloning and sequencing of dominant rDNA bands from DGGE to identify bacterial species.

Related Experiment Videos

  • BIOLOG EcoPlate assays for culture-dependent analysis of microbial activity and identification.

    • Main Results:

    • DGGE indicated that microbial communities were similar within the same plant species but unique across different species.
    • Analysis of Citrus sinensis revealed 17 unique bacterial sequences, with 13 potentially representing novel species.
    • Culture-dependent methods yielded different results, with most identified bacteria matching known phyllosphere inhabitants, and only two overlapping with culture-independent findings.

    Conclusions:

    • Phyllosphere microbial communities are significantly more diverse and complex than previously understood through conventional culture-based methods.
    • Culture-independent techniques like DGGE are essential for uncovering the true diversity of the phyllosphere microbiome, including novel species.
    • Discrepancies between culture-dependent and -independent methods underscore the limitations of each approach and the need for integrated strategies.