Allelopathic activity in barbados nut (Jatropha curcas L.)

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  • ナンヨウアブラギリのアレロパシー活性に関する研究
  • ナンヨウアブラギリ ノ アレロパシー カッセイ ニ カンスル ケンキュウ

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Abstract

Allelopathic activities of the leaves and cultivating soil in barbados nut during the cultivating season were investigated to clarify the impact on the surrounding environment into cultivation of this plant. Allelopathic activities of the raw, artificially dried and naturally dried young or adult leaves in barbados nut were assessed to the initial growth of lettuce. Their lengths in hypocotyl and radicle of lettuce seedlings were shorter than those on control from June to December by leachate from the artificially dried young and adult and naturally dried adult leaves. The soil cultivating barbados nut was investigated for assessment of allelopathic activities. Their lengths in hypocotyl and radicle of lettuce seedlings were shorter than those on non-transplanted soil under the soils collected in September from the base of barbados nut tree, and under the soils collected in July and October from between the trees, respectively. From the results of these experiments, it was found that the dried leaves of barbados nut have the highest allelopathic activities with the initial growth of lettuce of the year, and was thought that they might be affected on their surrounding plants. On the other hand, the initial growth of lettuce have affected under the cultivating soils of barbados nut tree on the periods of flowering or active assimilation. Therefore, it was suggested that the allelopathic activities in root of barbados nut tree might varied depending on the season to the growth of surrounding plants.

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