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Table 2 Growth rates of selected polyamine biosynthesis and transport system mutants

From: Putrescine biosynthesis and export genes are essential for normal growth of avian pathogenic Escherichia coli

Growth condition

Growth rate

Ā 

WT-ST117

Ī”speB/C-ST117

Ī”potE-ST117

M9 minimal medium

0.52Ā Ā±Ā 0.04

0.27Ā Ā±Ā 0.02a**

0.26Ā Ā±Ā 0.00a**

M9ā€‰+ā€‰putrescine

0.46Ā Ā±Ā 0.02 b*

0.46Ā Ā±Ā 0.01 b*

0.37Ā Ā±Ā 0.01a**,b*

M9ā€‰+ā€‰spermidine

0.42Ā Ā±Ā 0.01 b**

0.44Ā Ā±Ā 0.06 b*

0.43Ā Ā±Ā 0.02 b*

M9ā€‰+ā€‰ornithine

0.41Ā Ā±Ā 0.01 b*

0.30Ā Ā±Ā 0.01 a**

0.41Ā Ā±Ā 0.01 b*

M9+ arginine

0.47Ā Ā±Ā 0.00 b*

0.40Ā Ā±Ā 0.01a*,b*

0.28Ā Ā±Ā 0.06a**

  1. agrowth rates marked with a are significantly different from the growth rate of WT-ST117 growing at the same condition; mean values Ā± standard deviation
  2. bgrowth rates marked with b are significantly different from the growth rate of the same strain growing in M9 minimal medium without supplementation; mean values Ā± standard deviation; *pā€‰<ā€‰0.05;** pā€‰<ā€‰0.01
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BMC Microbiology

ISSN: 1471-2180

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