论文部分内容阅读
新番茄粉孢菌Oidium neolycopersici是近几年引起番茄白粉病的主要病原菌。在国内首次对该菌的生物学特性进行了研究。结果表明:新番茄粉孢菌分生孢子萌发的适宜温度范围为20-25℃,最适相对湿度范围为80%-100%,在水滴中不能萌发;该菌对光照条件和酸碱度的要求不严格,在pH3-12时其萌发率均能达到90%以上;在碳氮源利用方面,该菌分生孢子对各种碳源均能利用,以甘露糖和半乳糖效果最好;氮源以硝态氮(硝酸钾)为佳,铵态氮、有机态氮对其萌发有抑制作用;分生孢子萌发的致死温度为44℃10min。
Oidium neolycopersici is the main pathogen causing tomato powdery mildew in recent years. For the first time in China for the biological characteristics of the bacteria were studied. The results showed that the suitable temperature range for conidial germination of Alternaria pulcherrima was 20-25 ℃ and the optimum relative humidity range was 80% -100%, which could not germinate in water droplets. The requirements of the fungus for illumination and pH The results showed that the germination rate of the strain was able to reach more than 90% at pH3-12. In terms of the utilization of carbon and nitrogen sources, the conidia of the strain could utilize all kinds of carbon sources with the best effect of mannose and galactose; Nitrate (potassium nitrate) is preferred. Ammonium and organic nitrogen can inhibit germination. The lethal temperature of conidial germination is 44 ℃ for 10 min.