关键词: 毒素, 基本性质；杂交竹；专化性；暗孢节菱孢

Abstract:

The crude protein toxin and nonprotein toxin were prepared by the ammonium sulphate precipitation from the filtrate of A. phaeospermum cultured in the modified Fries culture medium under the optimum condition. The pathogenicity test showed the former had lower toxic activity than the latter with small molecule. Basic properties indicated that the nonprotein toxin had host-specificity to a certain degree, but not absolutely, and was situated between HST and NHST. It had strong thermal and ultraviolet stabilities, and was sensitive to pH, even easily affected by the alkalinity substance. Nine polar substances had different effects on the activity of toxin, which meant this toxin might be polar compound.

Key words: toxin, basic property；hybrid bamboo；specificity；Arthrinium phaeospermum