Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were...Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.展开更多
从台湾海峡天然海鱼共附生微生物群落分离得到29株放线菌,通过抗病毒和抑菌活性筛选,分别得到6株对烟草花叶病毒和植物病原真菌具有较强抑制作用的天然菌株。其中,菌株030603对供试植物病原真菌拮抗作用尤为显著,其发酵产物具有广谱抑...从台湾海峡天然海鱼共附生微生物群落分离得到29株放线菌,通过抗病毒和抑菌活性筛选,分别得到6株对烟草花叶病毒和植物病原真菌具有较强抑制作用的天然菌株。其中,菌株030603对供试植物病原真菌拮抗作用尤为显著,其发酵产物具有广谱抑菌活性,可以作为广谱性植物病原真菌拮抗菌株进行生防菌产业化开发及发酵产物活性成分的化学研究。该菌株形态特征、培养特性、生理生化特性与微白黄链霉菌基本一致,16 S rDNA序列同源性达99.5%。实验结果表明,利用天然海洋鱼类共附生微生物群落获取植物病原菌拮抗菌株具有取样便捷和活性菌株检出率高的特点。展开更多
文摘Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.
文摘从台湾海峡天然海鱼共附生微生物群落分离得到29株放线菌,通过抗病毒和抑菌活性筛选,分别得到6株对烟草花叶病毒和植物病原真菌具有较强抑制作用的天然菌株。其中,菌株030603对供试植物病原真菌拮抗作用尤为显著,其发酵产物具有广谱抑菌活性,可以作为广谱性植物病原真菌拮抗菌株进行生防菌产业化开发及发酵产物活性成分的化学研究。该菌株形态特征、培养特性、生理生化特性与微白黄链霉菌基本一致,16 S rDNA序列同源性达99.5%。实验结果表明,利用天然海洋鱼类共附生微生物群落获取植物病原菌拮抗菌株具有取样便捷和活性菌株检出率高的特点。
