ZOOSPORE ULTRASTRUCTURE OF POLYMYXA GRAMINIS
禾谷多粘菌游动孢子超微结构观察

The ultrastructure of nucleus,endoplasmic reticulum,golgi apparatus,mi- tochondria,lipid globule,expulsion vacuole,vesicle,cored vesicle,ribosome,kinetosome and pro- bes of the free secondary zoospores of Polymyxa graminis Led.,discharged from barley roots, were described.No microbody was seen in zoospores.The structure of rohr and stachel,which formed rapidly while the zoospore was encysting and penetrating the root cell,and the details of the zoospore penetration were also observed under electron microscope.