化感作用
生物测定
精油
发芽
苗木
生物
园艺
植物
芸苔属
生态学
作者
Liu Shanshan,Wang Hai-ying,Zhiming Liu
出处
期刊:Journal of Plant Resources and Environment
日期:2010-01-01
卷期号:19 (4): 56-62
被引量:2
摘要
Essential oil was obtained from above-ground part of Conyza canadensis(L.) Cronq.by steam distillation method,and main chemical components in the essential oil were identified by GC-MS technology.The result shows that the extraction rate of essential oil from C.canadensis is 0.07%.And main components are 2,3-dimethyl-4(3H)-quinazolinone,α-bergamotene,limonene glycol,(E)-β-farnesene and α-curcumene,in which,the relative content of 2,3-dimethyl-4(3H)-quinazolinone is the highest with a percentage of 54.41%.Taking Brassica chinensis L.,B.pekinensis(Lour.) Rupr.,Triticum aestivum L.and Sorghum bicolor(L.) Moench as tested species,the allelopathic effect of essential oil with different concentrations(0.75,1.5,3.0 and 6.0 g·L-1) was bioassayed by culture dish method.The results show that four bioassay indexes including seed final germination rate,seed germination index,seedling root length and seedling height of four tested species treated by essential oil with different concentrations are generally lower than those of the control and gradually decrease with rising of essential oil concentration.In which,four bioassay indexes in the treatment group with 0.75 g·L-1essential oil have no significant or highly significant differences with those in the control,but in the treatment group with 6.0 g·L-1 essential oil have significant or highly significant differences.The allelopathic effect indexes of four bioassay indexes of four tested species almost are negative values and their absolute values gradually enhance with rising of essential oil concentration,showing that the allelopathic effect of the essential oil is an inhibition role and the inhibition intensity relates to essential oil concentration.Among four tested species,the essential oil has an obvious inhibition effect on seed final germination rate of B.chinensis,and its half-inhibitory concentration(IC50) is about 3.0 g·L-1.In four bioassay indexes,seed final germination rate and seedling root length are more sensitive to the allelopathic effect of the essential oil.It is concluded that essential oil of C.canadensis has a certain allelopathy,and it can be used as botanical herbicide material to exploit and utilize.
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