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. 2015 Apr 29;6:291. doi: 10.3389/fpls.2015.00291

Figure 4.

Figure 4

The influence of exogenously applied polyamines on Fusarium culmorum and Fusarium oxysporum growth. (A) Areas of F. culmorum and F. oxysporum growth after exposure to polyamines (putrescine, spermidine, and spermine) at three concentrations (3, 6, and 10 mM) were estimated by densitometric analysis of test plates in relation to control plates. The data represent the mean ± standard deviations from three independent experiments. The significance of the differences between the means was determined using Student's t-test (*P < 0.05, **P < 0.01). putrescine: 3 mM (0.27 mg/ml), 6 mM (0.53 mg/ml), and 10 mM (0.89 mg/ml); spermidine: 3 mM (0.43 mg/ml), 6 mM (0.87 mg/ml), and 10 mM (1.45 mg/ml); spermine: 3 mM (0.61 mg/ml), 6 mM (1.21 mg/ml), and 10 mM (2.02 mg/ml). C, control; Put, putrescine; Spd, spermidine; Spm, spermine. (B) Growth of F. culmorum and F. oxysporum on plates with PDA medium (control) and PDA medium containing spermidine at three concentrations: 3 mM (0.43 mg/ml), 6 mM (0.87 mg/ml), and 10 mM (1.45 mg/ml).