Table 1

Antibacterial, phytotoxicity and hemolytic activity of BP100 derivatives
BP100 derived peptide # Amino acids Antimicrobial activity Phytotoxicity (germination) Phytotoxicity at 150 μM(inoculation) Hemolytic activity at 150 μM
Ea Pss Xav Dc Fv
BP100 11 2.5 - 5.0 2.5 - 5.0 5.0 - 10 5-10 <2.5 64 0.90 ± 0.05a 22.0 ± 2.8
unmodified BP100 11 5.0 - 10 5.0 -10 10 - 20 10 - 20 <2.5 64 0.80 ± 0.02a 1
BP100.1 15 2.5 - 5 2.5 - 5 1.25 - 2.5 10 - 20 <2.5 64 1.17 ± 0.09ab <1
BP100.2 30 5.0 - 10 5.0 -10 5.0 - 10 >40 <2.5 32 1.15 ± 0.07ab 3
BP100.2i 30 2.5 - 5 2.5 - 5 1.25 - 2.5 20 - 40 2.5 - 5 16 1.32 ± 0.06b 4
BP100.3 45 >20 >20 10 - 20 >40 5-10 16 1.38 ± 0.04b 4
BP100.2mi 48 2.5 - 5 2.5 - 5 <0.6 20 - 40 2.5 - 5 16 1.46 ± 0.12b 5

Antibacterial activity was determined against Erwinia amylovora (Ea), Pseudomonas syringae pv. syryngae (Pss) and Xanthomonas axonopodis pv.vesicatoria (Xv) as reporter species, and against the rice pathogens Dickeya chrysanthemi (Dc) and Fusarium verticillioides (Fv).

Minimal inhibitory concentrations (MIC) are given in μM and were calculated with 108 bacterial CFU/ml or 104 conidia/ml. Phytotoxicity values in rice germination assays are given as minimal peptide concentrations (μM) causing significant alteration of shoot length. Phytotoxicity values in tobacco leaf inoculation assays are given as the mean of the lesion diameter (cm) and standard error upon inoculation of 150 μM peptide solutions. Letters indicate different groups in one-way ANOVA analysis and Tukey's b posttest with α = 0.05. Hemolytic activity is given as the ratio between each peptide and the reference peptide BP100 (calculated at 150 μM and given in % with confidence interval for α = 0.05 [47]).

Nadal et al.

Nadal et al. BMC Plant Biology 2012 12:159   doi:10.1186/1471-2229-12-159

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