Abstract：
:Spontaneous white mutants from sectors of Streptomyces hygroscopicus 111-81 were isolated. The comparison of morphological, cultural, and biochemical properties of the mutants and ancestor showed the differences in colors of aerial, substrate mycelia, and sporulation. Changes in resistance to antibiotics and sensitivity to lysozyme indicated alterations in cell walls and cell membranes of the mutants. They showed antifungal activity close to that of the parent strain on fermentation medium FM2, with unchanged component composition of the AK-111-81 antibiotic complex. The cells of spontaneous white mutants are characterized with electron-transparent structures, vacuoles, aggregation of ribosomes, intrahyphal growth, and lack of multiple cell septa, which was established by transmission electron microscopy. The appearance of white sectored-mutants in S. hygroscopicus 111-81 is connected with exhausting of nutrients causing the substrate limitation and is a stress response to starvation.
journal_name
Curr Microbioljournal_title
Current microbiologyauthors
Gesheva Vdoi
10.1007/s00284-008-9165-1subject
Has Abstractpub_date
2008-08-01 00:00:00pages
133-8issue
2eissn
0343-8651issn
1432-0991journal_volume
57pub_type
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