Study on the allelopathy of Eucalyptus camaldulensis in Taiwan
| Autor: | Kai-Yun Li, 黎凱允 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 River red gum (Eucalyptus camaldulensis), native to Australia, has been reported that the secondary metabolites released from this plant have allelopathic effects. Based on the responses of several bioassay materials to allelochemicals released from river red gum, the water extract highly inhibited seed germination, radicle and hypocotyl elongation of vegetables including edible amaranth (Amaranthus gangeticus L.) and radish (Raphanus sativus L.), which were ideal candidates for detecting allelopathic activity. Field survey of weed flora and soil seed bank in and out of the Eucalyptus forest suggested that some of the native weed flora were suppressed or even failed to germinate due to the competition, shading or allelopathic effect of Eucalyptus. Experiment of 7-weed species cultivation with eucalyptus leaf powder and soils showed that seedling growth of Amaranthaceae family was strongly inhibited by leaf powder. For identifying the volatile and water-soluble allelopathic compounds, the gallic acid (GA) in boiling water extract was quantified by HPLC and tested by bioassay systems. In addition, the allelopathic activity of the essential oil was detected by bioassay systems. The result showed that GA and 1, 8-cineole played an important role in allelopathic effect of Eucalyptus. Microscopic observation of chromosomes in Amaranth radicles also showed that mitosis was retarded significantly by GA and 1,8-cineole, especially the later, but there was no difference in the relative percentage of cells stayed in different mitotic cell division stages. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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