一种腹柱虫包囊形成和解脱过程中核的行为研究

腹柱虫Ｇａｓｔｏｓｔｙｌａ ｓｐ．成包囊过程中，其纤毛器的分化不论是从细胞前端或是细胞后端开始，其大、小核的变化是相同的。首先，两个大核先出现复制带，然后两个大核融合成一个圆球形融合大核。另外也观察到二核包囊和四核包囊，融合大核在包囊进入休眠之前出现复制带，改组后的融合大核在休眠包囊中分裂为二。在成包囊过程中，两个小核中的一个被吸收。出包囊时，小核分裂为二，融合大核行无丝分裂成两个大核。

THE BEHAVIOR OF MACRONUCLEUS AND MICRONUCLEUS DURING ENCYSTMENT AND EXEYSTMENT OF GASTROSTYLA SP

During encystment of Gastrostyla sp.Its macronucleii and micronucleii under went the sameprocess of changingin the cell,whether the differentiation of ciliature was initiated from the cell's anterior or its posterior.Two macronuclei appeared replication bands first, then they were fused into a spherical fusion macronucleus. This was different from Euplotes encysticus, which organized replication bands during excystment. The cyst with two macronuclei or four macronuclei was observed,then the kinetosome could be observed in the cyst wall. The macronuclei also fused into a fusion macronucleus in the end. The fusion macronucleus organized replication bands before the cyst resting.Replicated fusion macronucleus would divided into two in resting cyst.During the process of encystment, one of two micronuclei was resorbed,This was similar to Oxytricha fallax , Stylonychia mytilus and Gastrostyla steinii during excystment ,the micronucleus was divieded into two.This was also similar to O. fallax and S. mytilus , while differented from Euplotes encysticus . The fusion macronucleus was divided into two during excystment.