枇杷炭疽病菌的生物学特性的研究

主要研究了温度、湿度、pH值、碳源、氮源和光照对枇杷炭疽菌(Colletotrichum gloeosporioidesPenz.)生长、孢子萌发的影响。结果表明:该菌丝生长的温度范围是10~35℃,最适28℃;分生孢子萌发的温度范围为10~35℃,最适25℃;在pH 3~10内该菌均能生长和产孢,菌丝生长最适为pH 6,分生孢子萌发最适为pH 5;分生孢子在饱和湿度或水滴中萌发较好,相对湿度小于85%时不能萌发。光照处理对菌丝生长速率无显著性影响。在供试的5种碳源中,菌丝生长速率以甘露醇、乳糖为最快;在供试的5种氮源中,菌丝生长速率以胱氨酸、尿素、甘氨酸为最快。分生孢子的致死温度为50℃、10 min或55℃5、min。

Biological Characteristics of Loquat Anthrax Bacteria ( Colletotrichum gloeosporioides Penz. )

The effect of temperature,moisture,pH value,carbon source,nitrogen source,and light on the mycelial growth,conidial germination of loquat anthracnose fungus(Colletotrichum gloeosporioides Penz.) was primarily studied.The results showed that the temperature for mycelial growth was from 10 to 35℃,the optimum was 28℃;the range of pH value was 3～10,the optimum being pH 6;For the conidial germination,the range of temperature was 10～35℃,the optimum being 25℃,the range of pH values was 3～10,the optimum being 5;The percentage of condial germination was higher under the saturated humidity or water-drop;The treatment of darkness with fluorescent light or with alternative fluorescent did not have significant effect on the mycelial growth,conidial germination.In the tested five carbon sources,mylial growth was the fastest on the media using mannitol,lactose as carbon sources,respectively;In the tested five nitrogen sources,rope grew fastest on the medium using DL-cystine,glycin,urea as nitrogen sources.The lethal temperature of condia was 50℃,10 min or 55℃,5 min.