Electron microscopic study of spore formation in Actinomadura verrucosospora
Soina, V.S.; Sokolov, A.A.; Agre, N.S.
Mikrobiologiia 46(4): 703-706
1977
ISSN/ISBN: 0026-3656 PMID: 909469 Document Number: 112129
Spore formation begins with the division of a hypha by cross-partitions which, as a rule, appear as monolayered on crosssections, thus differing from sporulation septae found in other actinomycetes. The structure and shape of septae change in the course of spore formation: first, they consist of 1 layer and have the same thickness as the cell wall; later, they consist of several layers and their thickness is uneven (dumbell shaped). In the course of spore maturation, thick regions of the septae are destroyed. Mature spores are characterized by the presence of vacuoles, the thickened cell wall and outer sheath; the latter bears rounded structures arranged in conglomerates which resemble grapes. The process of sporogenesis and the structure of spores in A. verrucosospora differ from those in other species of the Actinomadura genus, therefore, this genus of actinomycetes is heterogeneous.