Isolation of bacteria from Grifola frondosa cultivation on wood logs to find mycelial growth-promoting bacteria.

This study aimed to isolate bacteria that coexist with the edible mushroom Grifola frondosa when it is cultured on wood, and to determine their interactions; in turn, the aim was to find bacteria that stimulate mycelial growth so as to decrease the time required for spawn preparation on potato dextrose agar (PDA). Some Pseudomonas, Dyella, Bacillus , and Priestia spp. isolated from the cultivation surroundings of G. frondosa had a positive effect on the mycelial growth of the fungus in PDA. However, some isolated bacteria had a severe negative effect on the mycelial growth, especially Burkholderia spp. Thus, both mycelial-promoting bacteria and potentially pathogenic bacteria coexist with G. frondosa in cultivation. Enzyme activity assays indicated that some wood-degrading bacteria inhabit the cultivation surroundings of G. frondosa , and these bacteria probably help the fungus to degrade wood (especially cellulose). [ABSTRACT FROM AUTHOR]