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Allelopathic polyacetylenes fromCentaurea repens (Russian knapweed).

K L Stevens1

  • 1U.S. Department of Agriculture, Western Regional Research Center, 94710, Berkeley, California.

Journal of Chemical Ecology
|December 6, 2013
PubMed
Summary
This summary is machine-generated.

Russian knapweed (Centaurea repens) roots contain polyacetylenes that inhibit plant growth. Compound IX was identified as the primary allelopathic agent affecting surrounding plants.

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Area of Science:

  • Plant Science
  • Agroecology
  • Biochemistry

Background:

  • Russian knapweed (Centaurea repens) is an invasive weed known for its allelopathic properties.
  • Allelopathy, the release of chemicals by plants that affect other organisms, plays a role in plant community dynamics.

Purpose of the Study:

  • To identify and characterize the specific allelopathic compounds present in Russian knapweed roots.
  • To determine the effect of these compounds on the growth of neighboring plant species.

Main Methods:

  • Extraction and isolation of polyacetylenes from Russian knapweed roots.
  • Bioassays measuring root length elongation of target species (lettuce, alfalfa, barnyard grass, red millet) exposed to isolated compounds.
  • Chemical analysis of soil surrounding Russian knapweed roots.

Main Results:

  • Polyacetylenes VIII-XIV were identified in Russian knapweed roots.
  • Compound IX demonstrated significant inhibitory activity on root elongation in tested species.
  • Closely related isomers of compound IX showed no significant allelopathic effect.
  • Compound IX was detected in soil at concentrations sufficient to impact the surrounding plant community.

Conclusions:

  • Compound IX is a key allelopathic chemical produced by Russian knapweed.
  • The identified allelopathic activity of compound IX contributes to the ecological success of Russian knapweed invasions.
  • Understanding these allelochemicals can inform strategies for managing invasive plant species.