Studies on Allelopathic Interactions among Some Grassland Species. : 6. Screening of allelopathic activities from native grassland species by using the lettuce seed bioassay with the plant shoot extracts

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  • 草地におけるアレロパシーの解明とその評価に関する研究 : 6. 地上部水溶性抽出物のレタス発芽・生育試験による野草地構成植物からのアレロパシー発現種の検索
  • ソウチ ニ オケル アレロパシー ノ カイメイ ト ソノ ヒョウカ ニカンスル

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In order to evaluate the allelopathic potential of plant species commonly grown in semi-natural grassland, lettuce seed bioassay for 141 plants was conducted in laboratory. Lettuce seeds were germinated in petri dishes containing aqueous extracts of shoot from each plant. Three days after seeding, percentage of the germination was determined and radicle and hypocotyl length were measured. The results obtained are summarized as follows : Based on the strong reaction in both germination and seedling growth to the extracts, Anthoxanthum odoratum, Gnaphalium affine, Rhododendron japonicum and Corydalis heterocarpa may be classified in the plants with the most inhibitory activity. Aqueous extracts of Anthoxanthum odoratum, Ixeris stolonifera, Gnaphalium affine, Glechoma hederacea, Rhododendron japonicum, Plantago asiatica, Plantago lanceolata, Barbarea orthoceras, Corydalis heterocarpa and Sisyrinchium atlanticum strongly inhibited germination of lettuce seed. Aqueous extract of 15 species, such as Anthoxanthum odoratum, Briza minor, Trifolium repens, Pueraria labota, Indigofera pseudotinctoria, Gnaphalium afnne, Eupatorium chinense, Rubus parvifolius, Rhododendron japonicum, Hydrocotyle raminora, Polygala japonica, Corydalis heterocarpa, Haloragis micrantha, Solanum carolinense and Phytolacca americana, considerably reduced radicle and hypocotyl growth of lettuce seedling. Some of the species described above were well known as the alien plants that had become naturalized in Japan.

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