Study On Antifungal Activity Of Extract Of Poisonous Plants On Changbai Mountain And Two Monomers Of Juglans Mandshurica Maxim.

The 37 extracts of 18 poisonous plants from Changbai Mountain were tested antifungal activity in the lab, results showed: Veratum alkaloid(s)(1.14%), Corydalis alkaloid and Cnidium had broad-spectrum antifungal activity, the inhibitory rate of mycelial growth were higher than 50% to 6 kinds of plant pathogenic fungi; furthermore, extract of Veratum alkaloid(sol)(1.74%),Tripterygium , Corydalis chloroform alkaloid,Juglans butanol,Angelica petroleum ether, Cimicifuga petroleum ether,Cimicifuga butanoK Pinellia had broad-spectrum antifungal activity, their inhibitory rate of mycelial growth were higher than 50% to 5 kinds of plant pathogenic fungi. The same kinds of poisonous plants were distilled in dissimilar impregnant that had different antifungal activity. Inhibitory experiment of mycelial growth of 6 kinds of plant pathogenic fungi: extract of petroleum ether showed highest inhibitory activity in the crude extracts of Artemisia, butanol had higher inhibitory activity than chloroform to 4 kinds of pathogen except to Exserohilum turcicum and Colletotrichum orbiculare; magnitude of antifungal activity of extracts of Cimicifuga was chloroform>butanol>petroleum ether>phenol-acid to Rhizoctonia solani Kuhn,Fusarium oxysporum f. sp. cucumerinum and Exserohilum turcicum, however, butanol>petroleum ether>chlorofonn>phenol-acid to the rest 3 kinds of pathogen.The trial of inhibiting mycelial growth of two kinds of Juglans mandshurica monomer showed: both of them had highest inhibitory rate to Bipolar is maydis, EC50 were 2.76mg/L, 0.47mg/L; they had high inhibitory effect to Rhizoctonia pathogen, EC₅₀ were 10.63～15.88mg/L, 9.79～12.84mg/L, but they had low inhibitory effect to Fusarium pathogen, EC₅₀ were 22.92～36.07mg/L, 18.86～32.52mg/L; the effect of Juglone was under than 5,8-dihydroxy-1,4-naphthoquinone.The trial of inhibiting spore germination showed: Both of them had highest inhibitory rate to Bipolaris maydis, their inhibitory rate were higher than 60% at the concentration of 12.5mg/L; but they had low inhibitory rate to Alternaria alternate...