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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
  WT-ST117 ΔspeB/C-ST117 ΔpotE-ST117
M9 minimal medium 0.52 ± 0.04 0.27 ± 0.02a** 0.26 ± 0.00a**
M9 + putrescine 0.46 ± 0.02 b* 0.46 ± 0.01 b* 0.37 ± 0.01a**,b*
M9 + spermidine 0.42 ± 0.01 b** 0.44 ± 0.06 b* 0.43 ± 0.02 b*
M9 + ornithine 0.41 ± 0.01 b* 0.30 ± 0.01 a** 0.41 ± 0.01 b*
M9+ arginine 0.47 ± 0.00 b* 0.40 ± 0.01a*,b* 0.28 ± 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 ± 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 ± standard deviation; *p < 0.05;** p < 0.01