The Journal of General and Applied Microbiology
Online ISSN : 1349-8037
Print ISSN : 0022-1260
ISSN-L : 0022-1260
Short Communication
Formation of sporangiospores in Dictyobacter aurantiacus (class Ktedonobacteria in phylum Chloroflexi)
Shuhei YabeChiung-mei WangYu ZhengYasuteru SakaiKeietsu AbeAkira Yokota
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2019 Volume 65 Issue 6 Pages 316-319

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Abstract

Currently, actinomycetes and myxobacteria are the only bacteria believed to form sporangia. Here, we describe a sporangium-forming process identified in Dictyobacter aurantiacus strain S27T belonging to the class Ktedonobacteria in the phylum Chloroflexi. Microscopic observations showed that strain S27T forms a substrate mycelium and subsequently produces globose or subglobose terminal sporangia arising from the vegetative mycelia through short stalk cells. This morphogenetic differentiation is similar to that seen in members of Actinoplanes belonging to the class Actinobacteria. However, unlike in Actinoplanes, motile spores could not be observed. This is the first report of the existence of a bacterium, other than actinomycetes and myxobacteira, with a complex morphogenetic differentiation that forms sporangia and is an important microbiological discovery.

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© 2019, Applied Microbiology, Molecular and Cellular Biosciences Research Foundation
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