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Allelopathic substances in Pueraria thunbergiana.

Hisashi Kato-Noguchi1

  • 1Department of Biochemistry and Food Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan. hisashi@ag.kagawa-u.ac.jp

Phytochemistry
|June 18, 2003
PubMed
Summary

Pueraria thunbergiana leaves contain cis,trans-xanthoxin and trans,trans-xanthoxin, which inhibit cress root growth. These xanthoxins are identified as key contributors to the plant's allelopathic activity.

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Area of Science:

  • Plant Science
  • Biochemistry
  • Ecology

Background:

  • Pueraria thunbergiana exhibits allelopathic properties, influencing the growth of surrounding vegetation.
  • Identifying the specific compounds responsible for allelopathy is crucial for understanding plant interactions.

Purpose of the Study:

  • To isolate and identify the allelochemicals from Pueraria thunbergiana leaves responsible for growth inhibition.
  • To determine the chemical structures and quantify the identified compounds.
  • To evaluate the inhibitory effects of these compounds on seedling root growth.

Main Methods:

  • Extraction of putative allelochemicals using aqueous methanol.
  • Structure elucidation of isolated compounds using high-resolution mass spectrometry (MS) and 1H nuclear magnetic resonance (NMR) spectroscopy.
  • Bioassays to assess the root growth inhibition of cress (Lepidium sativum L.) seedlings at various concentrations.

Main Results:

  • Two growth inhibitors were identified as cis,trans-xanthoxin and trans,trans-xanthoxin.
  • cis,trans-Xanthoxin and trans,trans-xanthoxin inhibited cress root growth at concentrations above 0.3 microM and 3 microM, respectively.
  • The 50% inhibitory doses (ID50) for cress roots were 1.1 microM for cis,trans-xanthoxin and 14 microM for trans,trans-xanthoxin.
  • P. thunbergiana leaves contained 51.4 ng g(-1) fresh weight of cis,trans-xanthoxin and 72.5 ng g(-1) fresh weight of trans,trans-xanthoxin.

Conclusions:

  • Xanthoxins are identified as the primary allelochemicals in Pueraria thunbergiana leaves.
  • The presence and effectiveness of these xanthoxins suggest their significant role in the plant's allelopathic effects.
  • Released xanthoxins likely contribute to the observed growth inhibition in the soil environment.

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