Change of bacterial community structure during cellulose degradation by the microbial consortium.

Shiqi AI; Yiquan Zhao; Zhiyuan Sun; Yamei Gao; Lei Yan; Hongzhi Tang; Weidong Wang

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Change of bacterial community structure during cellulose degradation by the microbial consortium.

Author: Shiqi AI ¹ ; Yiquan ZHAO ¹ ; Zhiyuan SUN ¹ ; Yamei GAO ¹ ; Lei YAN ¹ ; Hongzhi TANG ² ; Weidong WANG ¹
Author Information

1. Heilongjiang Provincial Engineering Technology Research Center of Straws Resources Utilization, Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Agro-Waste in Cold Region, College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China.
2. State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
Publication Type:Journal Article
Keywords: cellulose; consortium; degradation; microbial diversity
MeSH: Bacteria; classification; metabolism; Biodegradation, Environmental; Cellulose; metabolism; DNA, Bacterial; genetics; Microbial Consortia; RNA, Ribosomal, 16S; genetics
From: Chinese Journal of Biotechnology 2018;34(11):1794-1808
CountryChina
Language:Chinese
Abstract: In order to clarify dynamic change of microbial community composition and to identify key functional bacteria in the cellulose degradation consortium, we studied several aspects of the biodegradation of filter papers and rice straws by the microbial consortium, the change of substrate degradation, microbial biomass and pH of fermentation broth. We extracted total DNA of the microbial consortium in different degradation stages for high-throughput sequencing of amplicons of bacterial 16 S rRNA genes. Based on the decomposition characteristics test, we defined the 12th, 72nd and 168th hours after inoculation as the initial stage, peak stage and end stage of degradation, respectively. The microbial consortium was mainly composed of 1 phylum, 2 classes, 2 orders, 7 families and 11 genera. With cellulose degradation, bacteria in the consortium showed different growth trends. The relative abundance of Brevibacillus and Caloramator decreased gradually. The relative abundance of Clostridium, Bacillus, Geobacillus and Cohnella increased gradually. The relative abundance of Ureibacillus, Tissierella, Epulopiscium was the highest in peak stage. The relative abundance of Paenibacillus and Ruminococcus did not change obviously in each stage. Above-mentioned 11 main genera all belonged to Firmicutes, which are thermophilic, broad pH adaptable and cellulose or hemicellulose degradable. During cellulose degradation by the microbial consortium, aerobic bacteria were dominant functional bacteria in the initial stage. However, the relative abundance of anaerobic bacteria increased gradually in middle and end stage, and replaced aerobic bacteria to become main bacteria to degrade cellulose.