Addition of bacterial culture strain P7014 and its supernatant to the mushroom growing media resulted in mushroom mycelia run faster. Mycelial growth rate of Pleurotus eryngii was increased up to 1.6 fold and primordial formation was induced one day earlier. Moreover, it was supposed that addition of bacteria had beneficial applications for commercial mushroom production, which appreciably reduced total number of days for cultivation of about 5 +/- 2 days compared with uninoculated, which took 55 +/- 2 days. (c) 2007 Elsevier Ltd. All rights reserved.