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http://dx.doi.org/10.5187/JAST.2012.54.6.435

Isolation and Identification of Lactic Acid Bacteria from Spent Mushroom Substrate for Silage Making and Determination of Optimal Medium Conditions for Growth  

Kim, Young-Il (Animal Science, School of Life Resource and Environmental Sciences, Konkuk University)
Kwak, Wan-Sup (Animal Science, School of Life Resource and Environmental Sciences, Konkuk University)
Publication Information
Journal of Animal Science and Technology / v.54, no.6, 2012 , pp. 435-442 More about this Journal
Abstract
This study was conducted to isolate and identify the lactic acid bacteria (LAB) from spent mushroom substrates (SMS) for the effective anaerobic fermentation to utilize SMS as an animal feed and to determine the optimal medium conditions for their growth. At first, a total of 23 strains were isolated from the ensiled SMS based on the LAB counts and pH tested. Then, a total of 16 strains which rapidly produce lactate and decreased the pH, were selected for a screening test. The optical density (OD), pH, and yellow clear zone were tested for the selected 16 strains. Among the strains, KU5 strain had wider yellow clear zone and lower pH and KU13 strain had higher OD at 24 hr of incubation and wider yellow clear zone compared to other strains and control strain (Lactobacillus plantarum KCCM 12116). Accordingly, KU5 and KU13 strains were finally selected. The KU5 and KU13 were identified as Lactobacillus plantarum by the 16S rRNA sequencing. The KU5 strain was named as Lactobacillus plantarum KU5, and the KU13 strain was named as Lactobacillus plantarum KU13. Lactobacillus plantarum KU5 and Lactobacillus plantarum KU13 were registered at the National Center for Biotechnology Information (NCBI). Access number of Lactobacillus plantarum KU5 was HQ542227 and that of Lactobacillus plantarum KU13 was HQ542228. The optimal medium conditions for growth of KU5 and KU13 were soybean meal 2% and formulated feed 2%, respectively.
Keywords
Spent mushroom substrate; Spent mushroom compost; Lactic acid bacteria; Fermentation; Silage;
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