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Sporulationsverhalten von Bacillus megaterium während Kohlenstoffhunger

✍ Scribed by Dr. Sigrid Kretschmer

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
474 KB
Volume
11
Category
Article
ISSN
0233-111X

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✦ Synopsis

Sporulationsverhalten von Bacillus megaterium

wahrend Kohlenstoff hunger

SIGRID KRETSCHMER

(Eingegangen am 14. 9. 1970) Some parameters of sporulation were determined from different carbohydrate-limited B. megaterium cultures, which grew with doubling times o f t = 45,80, and 190 min, respectively. The frequency of spore formation was 90-950,/,.

Forespores and spores appeared asynchroneously. This asynchrony was due t o the heterogenity in cell size of the populations. Spores within the smallest cells developed 90 min later than in the larger ones. As the extent of synchrony was the same with all three media, initiation of sporogenesis should occur independently of the respective stage of the cell cycle.

The time passing between to (begin of the stationary growth phase) and the formation of the spore septum varied in the different media. Thus, the time at which the latter process starts is not directly determined by the end of the net growth but probably by processes which are connected with initiation of cell division.

A model of cell division is presented according to that membrane syfithesis during elongation of cells occurs a t an annular zone a t the newly formed poles of daughter cells. Sporulation septum then might be the product of a reinitiated, additional membrane synthesis at this site, the activity of which normally is repressed by the next division and remains repressed under non-starvation conditions.

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