Title: Study on Allelopathy Effects of Ipomoea cairica II. Allelopathic Potentials of Litters
Abstract: Apart from its competitive ability,the non-native plants are thought to be due to an ability to displace other species by means of allelopathy.The allelopathic potential of aqueous extracts of litter(leaf and flower) and fresh materials(branch and leaf) of Ipomoea cairica,an invaded weed was investigated.The bioactivity of the aqueous extracts were evaluated on the seed germination and seedling growth of the following plants: radish(Raphanus sativus),lettuce(Lactuca sativa) and Mikania micrantha(a serious invasive weed in south China).The results showed that the aqueous extracts from both litter and fresh materials had allelopathic effects.When the concentration of aqueous extracts was 0.1 g·mL-1,the germination ratio and the growth of root of the receptor plants were markedly inhibited.The allelopathy inhibition decreased with decreasing concentration,when the concentration decreased to 0.005 g·mL-1,the growth of root length of the receptor plants had been stimulated obviously;however,the seed germination of radish and lettuce was inhibited and that of M.micrantha was stimulated but less significant.Generally,the extracts from flower litter had much more allelopathy inhibition under higher concentration,and that from the leaf litter had much more allelopathy stimulation under lower concentration.The seed germination and the growth of root of M.micrantha were inhibited significantly under higher concentration,which implied that it may provide a new way for controlling the invasion of M.micrantha through the allelopathy inhibition of I.cairica.
Publication Year: 2008
Publication Date: 2008-07-25
Language: en
Type: article
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