3.7 Microbiological and plant experiments
Three bacterial strains B1, B2, and B3 were isolated from OS soil
samples and identified as Pseudomonas stutzeri , Bacillus
pumilus , and Pseudomonas anguilliseptica (Fig. 8a, b,
c ), respectively. Simultaneously, Pseudomonas and Bacillus belong to
keystone taxa in OS microbial network. A one-week petroleum hydrocarbon
degradation experiment shows that the degradation efficiency for strain
B1, B2, B3, and SynCom reached 32.4%, 37.1%, 40.2%, and 45.6%,
respectively (Fig. 8d ). Then SynCom was used to identify the
effects of co-cultured bacterial strains B1, B2, and B3 on the growth of
maize seedlings under petroleum pollution. The results showed that
SynCom treatment significantly improves the seedlings’ dry weight, shoot
length, and root length (Fig. 8e ).