Phytotoxic substances with allelopathic activity may be central to the strong invasive potential of Brachiaria brizantha

Hisashi Kato-Noguchi, Ai Kobayashi, Osamu Ohno, Fukiko Kimura, Yoshiharu Fujii, Kiyotake Suenaga

研究成果: Article査読

23 被引用数 (Scopus)

抄録

The grass Brachiaria brizantha, native to eastern Africa, becomes naturalized and dominant quickly in the non-native areas. It was hypothesized that phytotoxic chemical interaction between this plant and native plants may play an important role in the invasion of B. brizantha. However, no potent phytotoxic substance has been reported in this species. Therefore, we investigated possible allelopathic activity and searched for phytotoxic substances with allelopathic activity in B. brizantha. An aqueous methanol extract of B. brizantha inhibited the growth of roots and shoots of garden cress (Lepidium sativum), lettuce (Lactuca sativa), timothy (Phleum pratense) and ryegrass (Lolium multiflorum) seedlings. The extract was purified by several chromatographic runs and three allelopathically active substances were isolated and identified by spectral analysis as (6R,. 9R)-3-oxo-α-ionol, (6R,. 9S)-3-oxo-α-ionol and 4-ketopinoresinol. (6R,. 9R)-3-Oxo-α-ionol and (6R,. 9S)-3-oxo-α-ionol inhibited root and shoot growth of garden cress at concentrations greater than 30 and 10. μM, respectively. The activity of (6R,. 9S)-3-oxo-α-ionol was 5.3- to 6.2-fold that of (6R,. 9R)-3-oxo-α-ionol. The stereochemistry of the hydroxyl group at position C-9 may be important for the inhibitory activities of those compounds. 4-Ketopinoresinol inhibited root and shoot growth of garden cress at concentrations greater than 30. μM. The growth inhibitory activity of (6R,. 9S)-3-oxo-α-ionol was the greatest and followed by 4-ketopinoresinol and (6R,. 9R)-3-oxo-α-ionol. These results suggest that those phytotoxic substances may contribute to the allelopathic effect caused by B. brizantha and may be involved in the invasion of B. brizantha.

本文言語English
ページ(範囲)525-530
ページ数6
ジャーナルJournal of Plant Physiology
171
7
DOI
出版ステータスPublished - 2014 4月 15

ASJC Scopus subject areas

  • 生理学
  • 農業および作物学
  • 植物科学

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