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Related Experiment Videos

Agglutination, adherence, and root colonization by fluorescent pseudomonads.

D C Glandorf1, I van der Sluis, A J Anderson

  • 1Section of Plant Pathology, Department of Plant Ecology and Evolutionary Biology, Utrecht University, 3584 CA Utrecht, The Netherlands.

Applied and Environmental Microbiology
|June 1, 1994
PubMed
Summary

Plant roots release compounds that can clump (agglutinate) specific bacteria, influencing initial attachment but not long-term colonization by fluorescent pseudomonads.

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Area of Science:

  • Microbiology
  • Plant-Microbe Interactions
  • Biochemistry

Background:

  • Fluorescent pseudomonads are common soil bacteria that interact with plant roots.
  • Plant root exudates can contain various compounds that influence microbial behavior.

Purpose of the Study:

  • To investigate the role of root-derived agglutinins in the interaction between plants and fluorescent pseudomonads.
  • To determine if root agglutination affects bacterial adherence and colonization of plant roots.

Main Methods:

  • Analyzing root washes from various crops for agglutination activity against fluorescent pseudomonads.
  • Fractionating root wash components by molecular mass and ion-exchange chromatography.
  • Studying the effect of these components on bacterial adherence and root colonization in controlled experiments.

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Main Results:

  • Two types of agglutination activities were found in root washes: high-molecular-mass components agglutinating specific isolates and lower-molecular-mass components agglutinating most isolates.
  • Components suppressing agglutination were also detected.
  • Short-term adherence was largely independent of agglutination, although high-molecular-mass components influenced adherence in some cases.
  • Root colonization over 7 days was not correlated with agglutination phenotype.

Conclusions:

  • Root agglutinins can play a role in the short-term adherence of pseudomonads to plant roots.
  • These agglutinins do not appear to be critical for long-term root colonization by fluorescent pseudomonads.