稗草生防菌新月弯孢菌株J15(2)的生物学特性

The Biological Characteristics of Echinochloa crus-galli Pathogen Culvularia lunata Strain J15(2)

研究了分离自稗草上的一个致病菌新月弯孢Curvularia lunata菌株J15（2）的基本生物学特性。结果表明，该菌菌丝生长、产孢的最适温度为28～32℃，pH为6～8。菌丝生长对光照无要求，黑暗利于增加产孢量，培养至15d可达产孢高峰。碳、氮、磷和硫等元素是该菌菌丝体生长、产孢的必需元素，钾、镁和铁对菌丝体的生长、产孢有极大的促进作用。分生孢子萌发的适宜温度范围为20～35℃，最适温度28℃；适宜培养基初始pH值在4～10之间。在58℃下，分生孢子10min失活。

The pathogen Culvularia lunata isolated from Echinochloa crus-galli is a potential mycoherbicide against this weed. The objective of this study was to determine biological characteristics of this pathogen. Optimal temperature ranged from 28℃ to 32℃ for mycelium growth and sporulation. The optimal initial pH of culture media was 6 - 8. Mycelia could grow in either dark or light, but darkness was beneficial for sporulation. Adding P, S, K, growth and sporulation. Optimal temperature ranged from 20℃ to 35℃ for conidium germination. The lethal temperature for conidia is at 58℃ （10 min）. Optimal initial pH value was from 4 to 10 for conidial germination.