Competition between oral Streptococcus species in the chemostat under alternating conditions of glucose limitation and excess
Oral Streptococcus species experience carbohydrate limitation interrupted by periods of substrate excess following food intake by the host. To investigate the competitiveness of various streptococcal species under fluctuating carbohydrate supply, 2-membered chemostat cultures were run. Under continu...
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Veröffentlicht in: | FEMS microbiology ecology 1985, Vol.31 (6), p.373-379 |
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Sprache: | eng |
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Zusammenfassung: | Oral
Streptococcus species experience carbohydrate limitation interrupted by periods of substrate excess following food intake by the host. To investigate the competitiveness of various streptococcal species under fluctuating carbohydrate supply, 2-membered chemostat cultures were run.
Under continuous limitation of glucose or sucrose, all 6
Streptococcus mutans test strains were outcompeted by
Streptococcus sanguis P4A7 or
Streptococcus milleri B448. This indicated that
S. mutans had a lower affinity for glucose and sucrose than
S. sanguis and
S. milleri.
Mixed cultures were then subjected to hourly pulses with glucose. Under these conditions
S. mutans Ny344 competed successfully with
S. milleri B448, but still lost the competition against
S. sanguis P4A7. The streptococci responded to pulses by taking up glucose at the maximum rate almost instantaneously.
S. sanguis P4A7 had the highest rate of glucose uptake while the
q
max value of
S. mutans Ny344 was higher than that of
S. milleri B448. This suggested a causal relationship between
q
max and competitiveness. |
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ISSN: | 0378-1097 0168-6496 1574-6968 |
DOI: | 10.1016/0378-1097(85)90034-5 |