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Related Experiment Video

Updated: Apr 11, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.
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Phytotoxic substance with allelopathic activity in Brachiaria decumbens.

Ai Kobayashi, Hisashi Kato-Noguchi

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    |June 11, 2015
    PubMed
    Summary

    The invasive grass Brachiaria decumbens contains a compound, (6R,9S)-3-oxo-α-ionol, that inhibits seedling growth. This phytotoxin may explain the plant's dominance in new environments.

    Area of Science:

    • Plant Science
    • Ecology
    • Biochemistry

    Background:

    • Brachiaria decumbens is an invasive grass known for its rapid naturalization and dominance in non-native regions.
    • The mechanisms behind its invasive success are not fully understood, with phytotoxic substances being a potential contributing factor.
    • Previous research has not identified potent phytotoxic compounds in B. decumbens.

    Purpose of the Study:

    • To identify phytotoxic substances with allelopathic activity in Brachiaria decumbens.
    • To investigate the role of these substances in the plant's invasive and dominant behavior.

    Main Methods:

    • An aqueous methanol extract of B. decumbens was prepared and tested for its effect on seedling growth.
    • Chromatographic methods were used to purify the extract and isolate active compounds.

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  • Spectral analysis was employed to identify the isolated phytotoxic substance.

    • Main Results:

    • The B. decumbens extract significantly inhibited the root and shoot growth of cress, lettuce, timothy, and ryegrass seedlings.
    • A phytotoxic compound, identified as (6R,9S)-3-oxo-α-ionol, was isolated and characterized.
    • The presence of (6R,9S)-3-oxo-α-ionol was also confirmed in other Brachiaria species, including B. brizantha and a Brachiaria hybrid.

    Conclusions:

    • The identified compound, (6R,9S)-3-oxo-α-ionol, likely contributes to the allelopathic effects observed in B. decumbens extracts.
    • This compound may play a significant role in the invasion and domination of B. decumbens in new habitats.
    • (6R,9S)-3-oxo-α-ionol may be a key factor in the phytotoxicity of various Brachiaria species.