Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Metagenomic analysis of bacterial community structure and diversity of lignocellulolytic bacteria in Vietnamese native goat rumen

  • Do, Thi Huyen (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Dao, Trong Khoa (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Nguyen, Khanh Hoang Viet (Graduate University of Science and Technology, Vietnam Academy of Science and Technology) ;
  • Le, Ngoc Giang (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Nguyen, Thi Mai Phuong (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Le, Tung Lam (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Phung, Thu Nguyet (Institute of Biotechnology, Vietnam Academy of Science and Technology) ;
  • Straalen, Nico M. van (Department of Ecological Science, Vrije Universiteit Amsterdam) ;
  • Roelofs, Dick (Department of Ecological Science, Vrije Universiteit Amsterdam) ;
  • Truong, Nam Hai (Institute of Biotechnology, Vietnam Academy of Science and Technology)
  • Received : 2017.03.03
  • Accepted : 2017.09.04
  • Published : 2018.05.01
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Abstract

Objective: In a previous study, analysis of Illumina sequenced metagenomic DNA data of bacteria in Vietnamese goats' rumen showed a high diversity of putative lignocellulolytic genes. In this study, taxonomy speculation of microbial community and lignocellulolytic bacteria population in the rumen was conducted to elucidate a role of bacterial structure for effective degradation of plant materials. Methods: The metagenomic data had been subjected into Basic Local Alignment Search Tool (BLASTX) algorithm and the National Center for Biotechnology Information non-redundant sequence database. Here the BLASTX hits were further processed by the Metagenome Analyzer program to statistically analyze the abundance of taxa. Results: Microbial community in the rumen is defined by dominance of Bacteroidetes compared to Firmicutes. The ratio of Firmicutes versus Bacteroidetes was 0.36:1. An abundance of Synergistetes was uniquely identified in the goat microbiome may be formed by host genotype. With regard to bacterial lignocellulose degraders, the ratio of lignocellulolytic genes affiliated with Firmicutes compared to the genes linked to Bacteroidetes was 0.11:1, in which the genes encoding putative hemicellulases, carbohydrate esterases, polysaccharide lyases originated from Bacteroidetes were 14 to 20 times higher than from Firmicutes. Firmicutes seem to possess more cellulose hydrolysis capacity showing a Firmicutes/Bacteroidetes ratio of 0.35:1. Analysis of lignocellulolytic potential degraders shows that four species belonged to Bacteroidetes phylum, while two species belonged to Firmicutes phylum harbouring at least 12 different catalytic domains for all lignocellulose pretreatment, cellulose, as well as hemicellulose saccharification. Conclusion: Based on these findings, we speculate that increasing the members of Bacteroidetes to keep a low ratio of Firmicutes versus Bacteroidetes in goat rumen has resulted most likely in an increased lignocellulose digestion.

Keywords

References

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