金钱松内生真菌杀螺活性菌株筛选

目的筛选出对钉螺具有致死作用的金钱松内生真菌菌株，并进行形态学初步鉴定。方法  从药用植物金钱松的18株内生真菌中，按照WHO的杀螺剂浸泡试验法观察不同内生真菌以及不同浓度发酵液杀螺效果，并采用玻片培养法进行真菌鉴定。结果JJ18菌株发酵液的中和液(pH=7)有较高的杀螺效果，24 h钉螺死亡率达26. 7%，48 h达76. 7%，72 h达100.O%。发酵液浓度为5%时，钉螺死亡率为53.3%；浓度为10%时，钉螺死亡率为86. 7%。其杀螺活性成分主要是发酵液的细胞外产物，且对鱼无急性毒性。通过鉴定该菌属于曲霉属。结论金钱松内生真菌JJ18细胞外产物具有一定的杀螺效果，可作为筛选新型杀螺药物的资源。

Molluscicidal experiment of endophytes from Pseudolarix kaempferi Gord

Objective To screen 18 endophytes from Pseudolarix kaempferi Gord for molluscicidal effect and identify them by morphology. Methods Molluscicidal tests were performed according to the immersion test suggested by WHO and the strain screened was identified by the slide culture. Results The mortality rates of snails immersed by JJ18 broth salified (pH=7) were 26.7%, 76.7% and 100.0% for 24,48 h and 72 h, respectively, and 53.3% and 86.7% in 5% and 10% concentrations of JJ18 broth, respectively. The active components were extracellular moiety of the broth which had no acute toxicity to fish, and JJ18 strain belonged to Aspergillus. Conclusion Extracellular moiety of endophyte JJ18 from Pseudolarix kaempferi Gord is a new resource of molluscicide.