Mycobiology

The Korean Society of Mycology (한국균학회)
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In Vitro Antagonistic Characteristics of Bacilli Isolates against Trichoderma spp. and Three Species of Mushrooms

  • Kim, Wan-Gyu (Agricultural Microbiology Division, National Academy of Agricultural Science (NAAS), Rural Development Administration (RDA)) ;
  • Weon, Hang-Yeon (Mushroom Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Seok, Soon-Ja (National Agrobiodiversity Center, NAAS, RDA) ;
  • Lee, Kang-Hyo (Mushroom Research Division, National Institute of Horticultural & Herbal Science, RDA)
  • Published : 2008.12.31
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Abstract

Twenty isolates of Bacillus species obtained from livestock manure composts and cotton-waste composts were tested for their antagonistic effects in vitro against three green mold pathogens of mushrooms (Trichoderma harzianum, T. koningii, and T. viridescens). However, there exists a possibility Bacillus species may have antagonistic effects against mushrooms themselves, and thus the same 20 isolates were tested in vitro against three species of mushrooms (Flammulina velutipes, Lentinus edodes, and Pleurotus ostreatus). Of the 20 Bacillus species isolates tested, two inhibited mycelial growth of T. harzianum, seven that of T. koningii, and eight that of T. viridescens. Importantly, the bacterial isolates M27 and RM29 strongly inhibited mycelial growth of all the Trichoderma spp. isolates tested. The isolate M27 was subsequently identified as the most effective in inhibiting mycelial growth of all the Trichoderma species. Interesting results of the effect Bacillus isolates had upon the mushroom species followed. It was found that most Bacillus isolates except 5T33 at least somewhat inhibited mycelial growth of the three mushroom species or some of the mushrooms. Furhermore, the antagonistic effects of the bacterial isolates against the three species of mushrooms varied depending on the mushroom species, suggesting a role for mushroom type in the mechanism of inhibition. The bacterial isolates M27 and RM29 were identified as having the most antagonistic activity, inhibiting mycelial growth of all the Trichoderma spp. as well as mycelial growth of the three species of mushrooms. These results suggest that the bacterial isolates and their antagonistic effects on green mold pathogens should be further studied for their practical use for biological control of green mold in the growing room of the mushrooms.

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