Observation of Infection Process of Exserohilun monoceras and Alteration of Cellar Ultrastructure in Barnyardgrass
尖角突脐孢菌侵染过程及稗草反应超微结构观察*

The infection process of Exserohilum monoceras and alteration of cellar ultrastructure in infected barnyardgrass were observed by using scanning electron microscope and transmission electron microscope. The observation showed that the hypha began to form from the basal point of the conidia 8 hours after inoculation (HAI) and then penetrated barn-yardgrass leaves through stornata 13 HAI. The infection process finished from 24 to 26 HAI. After infected, cell membranes of the host were dramatically changed; starch particles disappeared in chloroplasts and lots of phenolic compounds occurred in the infected cells.