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《Journal of Anhui Agricultural Sciences》 2010-12
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Study on Active Components of Galla chinensis against Phytophthora infestans (Mont.) de Bary

HU Tong-le et al(Biological Control Center of Plant Disease and Plant Pests of Hebei Province,College of Plant Protection,Agricultural University of Hebei,Baoding,Hebei 071001)  
[Objective] The research aimed to study the main fungicidal activity components of extracts of Galla chinensis against Phytophthora infestans(Mont.)de Bary.[Method] A continuous step by step extraction were carried out by means of series of solvents including petroleum ether,benzene,95% ethanol,50% ethanol and 25% ethanol,and then bioactivity of the different extracts against P.infestans were assayed.[Result] The results showed that 3 kinds of the ethanol extracts showed similar inhibitory effect to zoospores release of P.infestans,the inhibition rate reached 55.95%-64.75% with the concentration of 100 μg/ml.However,at the same concentration,the inhibition rate of petroleum ether and benzene extracts were no more than 20.00%,which was significantly lower than that of the ethanol extracts.Gallotannin was isolated from the mixture of those ethanol extracts with glutin,and the results of bioassay indicated that the inhibition rate of tannin and the non-tannin components to zoospores release of P.infestans were 50.63% and 0.59% respectively with the concentration of 100 μg/ml,which suggested that gallotannin were the main bioactive components for the inhibition to P.infestans in Galla chinensis.Gallotannin gave stronger inhibition to mycelium growth than sporangia germination of P.infestans with the same dosage,the EC50 were 108.23 and 11.22 μg/ml respectively.[Conclusion] The study can provide the scientific basis for better using Galla chinensis to prevent and control P.infestans in the production of organic potato.
【Fund】: 河北省科技攻关项目(01220173D)
【CateGory Index】: S435.32
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