【摘要】 一九七七年自江苏省新洋试验站盐碱土中分离一株链霉菌,编号新1,经鉴定是白黄链霉菌 Streptomyces alloflavus 的一个新变种。室内测定,它是一株对多种植物病原细菌和植物病原真菌具有拮抗作用的广谱抗生菌,拮抗性强。其发酵液中抗生性物质的活性也较稳定。应用其发酵液、粗提液或培制的抗生菌剂对棉花枯萎病和水稻白叶枯病进行的盆栽和田间小区试验,取得一定防治效果,而且对植株不产生药害,是具有实践价值的一个菌株。更多还原

【Abstract】 A white antagonistic streptomyces,“Xin 1”was isolated from the saline—alkaline soil of Xinyang area,North Jiangsu Province.It grows favorably inorganic media containing proteins,with a broad antagonistic spectrum againstboth Gram positive and Gram negative bacteria as well as some plant pathogenicfungi.It was characterized morphologically and physiologically as a new va-riety,and designated by the name of streptomyces alboflavus var.XinyangensisYen and Zhang.The antibiotic substance produced in the fermentation liquid was ratherstable.It can stand a high temperature of 121℃ for half an hour and a pHrange from 4 to 10.Ultra-violet radiations and storage in room temperaturefor one year caused no deteriorative effect on its activity.The bean-cake meal—soil culture of“Xin 1”was used as antagonist pre-paration to control the Fusarium wilt of cotton in small plots and field expe-riments with an efficiency around 50%.The 1:10 dilution of fermentation liquidused as a spraying agent to combat rice leaf blight caused by Xanthomonasoryzae obtained the same control effect as 1:1000 phenazine.更多还原