Abstract
In the sporogenesis of Streptomyces, two basic stages can be considered: sporulation septum synthesis and arthrospore maturation. Most of the information about the ultrastructural changes accompanying the sporogenesis refer to the first stage of the process, but nothing has been published about the evolution of the sporulation septum during maturation. In a previous paper, proposed three basic types of sporulation septum formation in Streptomyces. Our ultrastructural study on the evolution of the sporulation septum during the early stages of arthrospore maturation in seven species of Streptomyces indicates correlation between the sporulation septum type and its evolution during the arthrospore maturation. In types I and II the material of the annuli was incorporated into the lateral walls of the arthrospore, whereas in types II and III the deposits were lysed during the maturation. Only in type III was the arthrospore wall synthesized de novo. In type I there was total integration and in type II there was partial integration of the septum into the arthrospore wall.
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