球孢白僵菌胞外蛋白酶与其毒力的关系

用液体培养和明胶脂平板法研究了球孢白僵菌不同菌株以及不同世代的胞外蛋白酶产酶水平与其毒力的关系，试验结果表明，不同菌株间以及同一菌株的不同世代间产酶水平存在着明显的差异，而且产酶水平的高低与其对马尾松毛虫的毒力存在着明显的线性相关性。

Relation between Extracellular Protease of Beauveria Bassiana and Its Virulence to Dendrolimus Punctatus

The relation between extracellular protease from 28 Beauveria bassianastrains and subcultures of a strain and their virulence were studied by liquid culture andgelatin-agar plate methods.The result showed that there was obvious difference in produc-tion of extracellar protease among the strains and subcultures,and the protease activity levelwas obviously correlated with the virulence of B.bassiana to Dendrolimus punctatus,indicat-ing that extracellular protease activity can be regarded as an estimate of the virulence of B.bassiana.