硬基网柄菌Dictyostelium firmibasis生活史的研究

摘要

The whole process of asexual life cycle on water-agar medium of Dictyostelium firmibasis,a new recorded species for China,was observed microscopically using a bi-concavity slide,including the characteristics of spores,myxamoebae,cell aggregations,pseudoplasmodium and mature development of sorocarps.The results show that spore germination and release of myxamebae in Dictyosteliumfirmibasis requires at least eight hours.The myxamebae were colorless and irregularly moved at high speed.The radiate type of cell aggregation was observed.Sorocarps are extremely sensitive to light,bringing about deformation,stagnation or even death under the stimulation of faint light during the maturation period.It needs about 12-14 hours to build a mature sorocarp from cell aggregation stage and the whole life cycle needs 36-38 hours.%本文研究了网柄细胞状黏菌中国新记录种硬基网柄菌Dictyostelium firmibasis从孢子-黏变形体-细胞集群-假原质团-成熟孢堆果的无性生活循环过程.结果表明:该种细胞状黏菌孢子萌发至少需要8h,孢子萌发释放出具有不规则形状的黏变形体,黏变形体无色并进行不规则的高速运动;黏变形体细胞集群为典型的辐射状;孢堆果对光极为敏感,在成熟发育期微弱的光刺激便会导致子实体生长畸形或停止生长并死亡;从集群开始形成到孢堆果成熟持续约12-14h,完成一个完整的生活史循环约需36-38h.