关键词: 小桐子, 枝叶, 提取物, 抗真菌活性

Abstract: The inhibitory effects of crude extracts from Jatropha curcas L. branches and leaves using six different solvents were tested against Fusarium graminearum，Pyricularia oryae Cav., Phytophthora nicotianae Breda de Haan. and Phytophthora capsici Leon, using mycelium growth inhibition method. Then active component separation and bioactivity assay were conducted on the crude extracts with the highest bioactivity. The results showed that the most active extracts from J.curcas L. branches and leaves against four plant pathogenic fungi was alcohol extracts,the inhibition rate to the mycelial radial growth of four plant pathogenic fungi was 87.1%, 90.3%, 86.4% and 77.9% when concentration was 0.8 g·L^-1, there was no obvious difference when comparing to 10% difenoconazole. In the bioassays of alcohol crude extracts by partitively extracting of five different solvents against Pyricularia oryae Cav. and Phytophthora nicotianae Breda de Haan. We found that the antifungal activity of petroleum ether and water fractions were all higher，the inhibition rate to the mycelial radial growth of two plant pathogenic fungi were all higher than 50% at concentration of 0.8 g·L^-1. It is suggested that the branches and leaves of J.curcas L. contain abundant substances with antifungal activity, the active components with the inhibitory effect on plant pathogenic fungi mainly exit in petroleum ether and water fractions of alcohol extracts from J.curcas L. branches and leaves.

Key words: Jatropha curcas Linn., branches and leaves, extracts, antifungal activity