Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4379906 | Acta Ecologica Sinica | 2011 | 5 Pages |
Abstract
Allelopathy of diterpenoids extracted from plants of the genus Robdosia on three common species of soil ciliates, Colpoda inflata, Colpoda cucullus and Euplotes muscicola, was studied by acute toxicity test, sub-lethal effect test and morphological observation. Acute toxicity test showed that there was remarkable toxicity of the diterpenoids on the individuals of the three soil ciliate species, and there was close correlation between toxicity and concentration of the diterpenoids. 12 h-LC50 values of the diterpenoids on the individuals of C. inflata, C. cucullus and E. muscicola were 161.40 mg Lâ1, 94.80 mg Lâ1 and 83.70 mg Lâ1 respectively, and 24 h-LC50 values were 114.90 mg Lâ1, 92.30 mg Lâ1and 65.80 mg Lâ1 separately. Sub-lethal effect test of soil ciliates suggested that there existed significant inhibition of the diterpenoids on population growth of the three ciliates with dose-dependant relationships, population density and growth rate of the test group was obviously lower than that of the control group. Morphological observation indicated that diterpenoids affected the body shapes of the three ciliates and made them shorter and thicker, and the higher the concentration of diterpenoids, the greater the affection. The results are of great significance for understanding the functions of ciliates and their relationships to other organisms, and for the application of allelopathy in biological pest control in the soil ecosystems.
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Ecology, Evolution, Behavior and Systematics
Authors
Ning Ying Zhi, Du Hai Feng, Zou Tao, Wang Hong Jun, Wang Xiao Jing, Liu Han Cheng, Ma Zheng Xue, Ding Lan,