The dissolution of polyhedra of Mythimna separata nuclear polyhedrosis. virus by digestive fluid (pH11. 03) collected from the 5th instar M. separata larvae was studied in vitro. Observations were made at timed interv...The dissolution of polyhedra of Mythimna separata nuclear polyhedrosis. virus by digestive fluid (pH11. 03) collected from the 5th instar M. separata larvae was studied in vitro. Observations were made at timed intervals using phase contrast microscopy and scanning electron microscopy. Under phase contrast microscopy, the polyhcdra lost their refrigence by 5 minute exposure to the digestive fluid. After exposure to the fluid for 30 minutes, all of the PIBs were dissolved. Chages of the PIBs were also observed under scanning electron microscopy, after 5 minute exposure to the fluid, damaged PIBs and PIB-derived debris were seen. After 30 minute exposure, only remains of PIBs were found. The effect of M. separata digestive fluid on the infectivity of Ms NPV was examined by nconatcs bioassay. The results indicated that virions from Ms NPV-PIBs were rapidly inactivated after 15 minute exposure to digestive fluid and all of virions were non-infectious.展开更多
基金The project is supperted by National Natural Science Fundation of China
文摘The dissolution of polyhedra of Mythimna separata nuclear polyhedrosis. virus by digestive fluid (pH11. 03) collected from the 5th instar M. separata larvae was studied in vitro. Observations were made at timed intervals using phase contrast microscopy and scanning electron microscopy. Under phase contrast microscopy, the polyhcdra lost their refrigence by 5 minute exposure to the digestive fluid. After exposure to the fluid for 30 minutes, all of the PIBs were dissolved. Chages of the PIBs were also observed under scanning electron microscopy, after 5 minute exposure to the fluid, damaged PIBs and PIB-derived debris were seen. After 30 minute exposure, only remains of PIBs were found. The effect of M. separata digestive fluid on the infectivity of Ms NPV was examined by nconatcs bioassay. The results indicated that virions from Ms NPV-PIBs were rapidly inactivated after 15 minute exposure to digestive fluid and all of virions were non-infectious.
