期刊
BIORESOURCE TECHNOLOGY
卷 331, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125066
关键词
Microbial consortium LDC; Lignin degradation; Rice straw; Pseudomonas
资金
- Key Project of Heilongjiang Natural Science Foundation [ZD2018005]
- National Key Research Program and development plan [2018YFD0800906-03]
- Program of Science and Technology Innovation Team in Heilongjiang Province [2012TD006]
- Research and Development Plan of Heilongjiang Agricultural Company [HKKY190404]
- Support Program of Scientific Research Team and Platform of HBAU [TDJH201809]
- Research Innovation Program for Graduates of Heilongjiang Bayi Agricultural University [YJSCX2019-Y70]
The lignin-degrading bacterial consortium LDC efficiently degrades rice straw lignin in mineral salt medium. The microbial community structure and enzyme expression levels vary greatly during different incubation phases, with significant up-regulation of lignin degradation enzymes. This provides valuable microbial resources and data support for the industrialization of rice straw bio-pulping.
The degradation of lignin is the main rate-limiting step in the bio-pulping of rice straw. A lignin-degrading bacterial consortium LDC, which can efficiently degrade lignin of reed, was screened in the early stage of our laboratory work. In present study, 7-day incubation of LDC can degrade rice straw lignin by 31.18% in mineral salt medium. The communities? structure of different incubation phases varied greatly, in which high abundance (44.78%) of Anaerocolumna was first found. The expression levels of lignin degradation enzyme class II peroxidase (AA2), vanillyl alcohol oxidase (AA4) and 1,4-benzoquinone reductase (AA6) during peak phase (48 h) were significantly up-regulated than initial phase (24 h), increasing by 112%, 165% and 67%, respectively, and 42.86% AA2 was from Thaurea; 100% AA4 was from Clostridium; 62.5% AA6 was from Pseudomonas. These provide microbial resources and data support for the industrialization of rice straw bio-pulping.
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