showed a trendp < 0.05
Although differences among the two strains just showed a trend ( p < 0.05), the treatment with the PB2OPT strain produced the highest gas volume both at 24 (+9.36% and +1.67% with respect to the control and the WT strain, respectively) and 48 h of incubation (+11.9% and +1.86% with respect to the control and the WT strain, respectively).