Among the seven isolates, A3, A8, B1, B2, B4 and C4 showed 100% sequence homology to the 16S rRNA-encoding gene sequence of B. subtilis strain ZQ1101 (Genbank accession no. KJ 538550.1) and 99% sequence similarity to B. subtilis strain LD181 (Genbank accession no. KJ564129.1). Bacterium C3 showed 100% sequence similarity to Paenibacillus polymyxa strain 1096 (Genbank accession no. EU982487.1).