International Journal of Microbiology / 2018 / Article / Tab 4

Research Article

Evaluation of Bacillus Strains for Plant Growth Promotion and Predictability of Efficacy by In Vitro Physiological Traits

Table 4

Growth promotion effects of five Bacillus strains on soybean plants in 4 greenhouse pot experiments, with the two strains having the highest measurements for each parameter indicated with shading.

StrainShoot fresh weight (g) (% increase)tRoot fresh weight (g) (% increase)tGSF (%)uFIT2 (%)v
Trial 1Trial 2Trial 3Trial 4Trial 1Trial 2Trial 3Trial 4

Bacillus megaterium R1811.3bcw (18)1.3ab (18)3.7ab (16)3.8ab (3)0.42b (−9)0.64b (60)1.7b (89)2.1a (31)5050
B. safensis R1731.5ab (36)1.5a (36)4.2a (31)4.2a (14)0.62ab (35)0.97a (142)2.2a (144)2.1a (31)88100
B. simplex R1803.9a (22)3.1b (−16)2.2a (144)1.3c (−19)5050
Paenibacillus cineris R1771.1c (0)1.1c (0)0.38b (−17)0.35c (−13)00
P. graminis R2001.6a (46)1.2bc (9)3.5ab (9)3.6ab (−3)0.88a (91)0.41c (3)1.5b (67)1.8ab (13)3825
Control1.1c1.1bc3.2ab3.7b0.46b0.40c0.9c1.6bcNAxNA
ANOVA P0.0010.0040.0540.0590.003<0.001<0.0010.004NANA

tPercentage increase of a growth variable by bacterial treatment compared to the control. uGSF = growth stimulation frequency; frequency at which a strain increased growth (at 95% confidence level) in all measurements across trials. vFIT2  = Frequency in top 2 strains category. wNumbers followed by the same letter in each column are not significantly different at α = 0.05 according to LSD test. xNA = not applicable. Significant difference between treatment and control () according to Dunnett’s test. — = no data or strain was not tested.

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