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Mycelial differentiation and spore formation by Streptomyces brasiliensis in submerged culture

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Streptomyces brasiliensis ATCC 23727 showed extensive sporulation when cultured in a liquid medium containing galactose and glutamic acid as carbon and nitrogen sources. Sporogenic hyphae formed under these conditions were morphologically similar and developmentally equivalent to aerial hyphae and metamorphosed into chains of spores by following a sequence of ultrastructural changes similar to that observed during growth on solid media. In addition, our electron microscopy study revealed two previously unrecognized aspects of hyphal development in streptomycetes: the formation of sporogenic hyphae was always preceded by changes in the structure of the nucleoid, and the sheath that characteristically covered these hyphae was not deposited coincidently with wall formation in the apical growing portion of the hypha.Key words: Streptomyces brasiliensis, mycelial differentiation, sporulation.

Streptomyces brasiliensis ATCC 23727 démontre une sporulation extensive lorsqu'il est cultivé dans un milieu liquide contenant du galactose et de l'acide glutamique en tant que sources de carbone et d'azote. Les hyphes sporogéniques formés dans ces conditions sont morphologiquement semblables et équivalents du point de vue développemental aux hyphes aériens et se sont métamorphosés en chaînes de spores suivant une séquence de changements ultrastructuraux semblables à ceux observés au cours de la croissance en milieu solide. De plus, notre étude par microscopie électronique a également mis en évidence deux aspects auparavant inconnus du développement des hyphes chez les streptomycètes : la formation des hyphes sporogéniques était toujours précédée par des changements dans la structure du nucléoïde, et la déposition de la gaine qui couvre typiquement ces hyphes n'est pas coïncidente avec la formation de la paroi dans la portion croissante apicale de l'hyphe.Mots clés : Streptomyces brasiliensis, différenciation mycéliale, sporulation.[Traduit par la Rédaction]

Keywords: Streptomyces brasiliensis; différenciation mycéliale; mycelial differentiation; sporulation

Document Type: Research Article

Publication date: 2001-11-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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