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Construction of a stable microbial community with high cellulose-degradation ability
Authors:Haruta S  Cui Z  Huang Z  Li M  Ishii M  Igarashi Y
Institution:(1) Department of Biotechnology, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan,;(2) Department of Agronomy, China Agricultural University, Yuanmingyuan West Road, Haidian District, Beijing 100094, P.R. China,;(3) Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, P.R. China,
Abstract:We bred a microbial community capable of degrading rice straw with high efficiency. The microbial community degraded more than 60% of rice straw within 4 days at 50 °C. The high stability of the community's degradation ability was demonstrated by its tolerance of being subcultured several times in medium with/without cellulosic material, being heated to 95 °C, and freezing at –80 °C. The community degraded both nonsterilized and sterilized substrate; and its degradation ability was not affected by pH changes in the medium (initial pH 5–9). PCR-denaturing gradient gel electrophoresis (DGGE) analyses based on 16S rDNA fragments showed that the community structure remained constant after multiple subcultures extending over 2 years. DNA sequence analyses of DGGE bands indicated the coexistence of both aerobic and anaerobic bacteria in the community. Electronic Publication
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