Protoplasts were isolated from the mature pollen grains of Lily using cellulase Onozuka R-10 and pectinase in B_5 medium. After isolation the protoplasts were treated with 5μg/ml cytochalasin B (CB) for 5, 10, 15, 30, and 60 min. The effects of the drug on the changes of the actin filamentous arrays in the pollen pro toplasts were monitored with TRITC-phalloidin staining without fixation. After the drug treatment, the filamentous arrays rapidly changed into granules. The sequence of events leading to the fo...