扁绒泡菌孢子形成过程超微结构

Ultrastructural studies on sporulation of Physarum compressum

诱导扁绒泡菌显型原质团形成子实体并观察在形成过程中孢囊的超微结构,结果表明,全部原质团参入形成孢子及孢丝;孢子形成初期原质团聚缩使原生质密度加大,脂滴密度也增加;液泡联合形成液泡网体分割原质团,孢子及孢丝一同形成;相邻孢子初始形成的孢子壁可见吻合的突起和凹陷,这是孢子成熟后的表面纹饰部分;孢子壁随孢囊发育逐渐达到适宜位置,孢子壁由透明内层及电子密度较大的外层组成;随后可见外有疣突,内含脂滴的圆形孢子。

Phaneroplasmodium of Physarum compressum was induced to form fruiting body and ultrastructure during sporangium development was observed. All plasmodia participate to form spores and capillitium. The density of protoplasm and the number of lipid droplets increase during plasmodium accumulation. During spore development,the plasmodia were divided by network of vacuole associated. Spore and capillitium developed simultaneously. Primary walls of neighbouring spores were protuberant and sunken inosculatedly,forming surface ornamentation patterns of spore. The spore wall moved to appropriate location with sporangium development,and the wall of primary spore consists of two layers：an electron dense outer layer and a translucent inner layer. Round spore subsequently forms external verrucae and internal lipid droplets.