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Table 1 The antimicrobial activity of cell-free filtrates of X. nematophila YL001 against different plant pathogens at varying pH values

From: Regulation of antimicrobial activity and xenocoumacins biosynthesis by pH in Xenorhabdus nematophila

Fungi and oomycetes

Inhibition rate (%)1

pH 5.5

pH 6.5

pH 7.0

pH 7.5

pH 8.5

Alternaria brassicae

26.86 ± 4.51d

34.69 ± 4.27c

61.78 ± 3.52b

61.36 ± 4.06b

99.28 ± 0.05a

Alternaria solani

35.61 ± 5.77d

54.84 ± 0.58c

60.71 ± 0.60c

70.28 ± 0.17b

97.84 ± 0.17a

Botrytis cinerea

74.47 ± 0.12b

100.00 ± 0.00a

100.00 ± 0.00a

100.00 ± 0.00a

100.00 ± 0.00a

Clomerela cinyulate

23.26 ± 3.05d

73.88 ± 3.05b

76.92 ± 3.01ab

81.22 ± 3.02a

53.67 ± 3.01c

Curvularia lunata (Wakker) Boed

41.94 ± 4.01b

70.47 ± 5.01a

69.06 ± 0.29a

68.14 ± 2.01a

71.02 ± 3.56a

Exserohilum turcicum

9.77 ± 3.45c

63.51 ± 3.11b

58.91 ± 2.09b

64.08 ± 4.05b

87.64 ± 4.32a

Fusarium graminearum

15.96 ± 2.89b

11.82 ± 1.74b

12.84 ± 2.32b

11.63 ± 2.33b

10.84 ± 2.66b

Fusarium oxysporium

18.43 ± 4.02cd

25.31 ± 5.20bc

20.15 ± 3.01cd

30.71 ± 4.09ab

37.35 ± 3.01a

Magnaporthe grisea

70.93 ± 0.05b

100.00 ± 1.28a

100.00 ± 0.71a

100.0 ± 1.00a

100.00 ± 0.79a

Physalospora piricola

5.82 ± 0.09c

36.83 ± 0.04b

100.00 ± 1.36a

96.14 ± 0.29a

100.00 ± 1.82a

Phytophthora capsici

13.50 ± 0.90e

39.24 ± 1.24d

72.95 ± 3.00c

85.34 ± 0.34b

91.34 ± 1.00a

Sclerotinia sclerotiorum

0.00 ± 0.00d

35.52 ± 5.01b

39.55 ± 3.02b

30.52 ± 2.68c

98.58 ± 0.35a

Verticillium dahlia

30.08 ± 4.04d

45.21 ± 5.10c

45.79 ± 4.01c

57.47 ± 4.05b

69.16 ± 4.01a

  1. 1The inhibition rate of 100 mL/L cell-free filtrate of X. nematophila YL001 culture on the mycelial growth of the pathogens tested after 7 days. Data are presented as mean ± SE (n = 6). Different lower case letters followed by the data of each pathogen tested indicate significant differences at P = 0.05