关键词: 唐山市, 唐山市, 重金属, 形态, 影响因素

Abstract:

In order to study possibility of Solanum torvum leaf against pathogenic fungi of horticultural crops as plant germicide, the crude extracts of wild eggplant Solanum torvum leaf were bioassayed. Use growth-rate and pendant-drop methods separately, to study antifungal activity of Solanum torvum leaf crude extracts on eight species fungal pathogens of horticultural crops mycelium growth and spore germination. The results showed that the Solanum torvum leaf crude extracts demonstrated significant antifungal activity; don’t determine spore germination Colletotrichum capsici. With extract concentration increased, bacteriostasic activity was enhanced. While tested at the concentration of 5 g/L, the extracts showed a certain degree of inhibition on mycelium growth and spore germination of all tested fungal pathogens, inhibition ratio both exceed 8.8%; while tested at concentration of 40 g/L, the inhibitory rate was at least 60%. The same concentration extract had different inhibitory action on different disease fungus. Virulence analysis results showed, extracts’ EC50 on mycelium growth of Colletotrichum capsici and Verticillium dahliae both under 10 g/L，their were 5.7577 and 7.6089 g/L respectively. On the whole, extract had more powerful inhibitory action on Verticillium dahliae and Colletotrichum capsici mycelium growth and spore germination, especially extract had more powerful inhibitory action on Sclerotinia sclerotiorum mycelium growth. The extracts of Solanum torvum leaf had more powerful inhibitory action on several kinds of pathogenic fungi of horticultural crops, as plant germicide, extracts of Solanum torvum leaf had further study and develop value.