. 2022 Apr 8;10(4):791. doi: 10.3390/microorganisms10040791

Table 4.

Interaction of the partially purified fraction (PPF) and streptomycin sulfate (Ss) against streptomycin-resistant bacteria using checkerboard assay.

Bacteria	FIC ¹		FICI ²	Outcome
Bacteria	Ss	PPF	FICI ²	Outcome
Aac ³	0.25 ± 0.00 ^b	0.42 ± 0.14 ^a	0.67 ± 0.14 ^ab	Partial synergy
At	0.50 ± 0.00 ^a	0.50 ± 0.00 ^a	1.00 ± 0.00 ^a	Additive
Pc	0.17 ± 0.07 ^c	0.41 ± 0.14 ^a	0.58 ± 0.19 ^b	Partial synergy
Sr-Pcc	0.25 ± 0.00 ^b	0.42 ± 0.14 ^a	0.67 ± 0.07 ^ab	Partial synergy
Xac	0.25 ± 0.00 ^b	0.50 ± 0.00 ^a	0.75 ± 0.00 ^ab	Partial synergy

¹ FIC: fractional inhibitory concentration, ² FICI: fractional inhibitory concentration index; ≤0.5, synergy; 0.5 < to ≤0.75, partial synergy; 0.75 < to ≤1; additive effect; 1 < to ≤4, indifference or no effect; and >4 antagonism., ³ Aac: A. avenae subsp. cattleyae; At: A. tumefaciens; Pc: P. chrysanthemi; Sr-Pcc: streptomycin-resistant P. carotovorum subsp. carotovorum; Xac: X. axonopodis pv. citri. Data are from three independent triplicates and presented as mean ± standard deviation. Means within the same column denoted by the different letters are significantly (p < 0.05) different according to Tukey’s HSD test.