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Deadly Presence: Allelopathic effects of Eucalyptus globulus

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Title:Deadly Presence: Allelopathic effects of Eucalyptus globulus
Authors:Singh, Kayani
Contributors:Daehler, Curtis (advisor)
Biology (department)
Keywords:Eucalyptus globulus
Date Issued:26 Sep 2014
Publisher:University of Hawaii at Manoa
Abstract:The Hawaiian Islands are famous for their natural beauty and abundance of unique endemic species; however, they are also vulnerable to invasive species. While human beings have introduced Eucalyptus globulus to many places for wood pulp, little research has been done on its potential for ecological harm, and the few studies that have indicate that E. globulus inhibits the growth of other plant species by releasing chemicals into the surrounding soil. This study seeks to identify how allelopathic chemicals produced by E. globulus leaves are released into the environment. In this study, the chemical compounds from E. globulus leaves were collected via two different means that simulate natural mechanisms. Living E. globulus leaves were misted with distilled water. Another set of leaves decomposed in plastic bags for two weeks before being homogenized in a sterile blender with distilled water. These solutions were put through bioassays to test their effect on the growth of different plant species: cilantro, lettuce, and pili grass. The treatment that was expected to have the most effect was the leaf litter. However, the results indicate that the leaf drip solution is more inhibitive. Additionally, while both of the cultivar species were inhibited, no effect on the native species was found. The leaf drip solution inhibited the growth of the lettuce by 62.5%, and the cilantro by 20.0%. The leaf litter solution inhibited the lettuce by 34.0%. Once the most damaging chemical release mechanisms are identified, it will be easier to develop methods to neutralize them.
Pages/Duration:33 pages
Rights:All UHM Honors Projects are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: Honors Projects for Biology

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