Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2720-2727.DOI: 10.3969/j.issn.1004-1524.2022.12.15

• Environmental Science • Previous Articles     Next Articles

Optimization of low temperature resistant corn stalk degrading bacterial community and its effect

WANG Yiran1,2(), KANG Zhichao1, ZHU Guopeng1, WANG Yang3, QI Geqi3,*(), YU Hongwen1,*()   

  1. 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
    2. School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China
    3. Hinggan League Institute of Agricultural and Animal Husbandry Sciences, Agriculture and Animal Husbandry Bureau of Hinggan League, Hinggan 137400, Inner Mongolia, China
  • Received:2022-03-22 Online:2022-12-25 Published:2022-12-26
  • Contact: QI Geqi,YU Hongwen

Abstract:

In order to adapt to the climate characteristics of low average annual temperature and frequent freezing and thawing in northeast China, this study optimized the construction of microbial community which could efficiently degrade straw in low temperature environment. The metagenomic sequencing technology was employed for correlation analysis of six bacterial genera (Sphingobacter, Arthrobacter, Flavobacterium, Geobacter, Delfteia and Sphingosphinomonas) in JZ5, an original frigostable straw degrading bacterial community. Besides, the composition of the original community JZ5 was simplified. The results showed that after 12 d of culture at 15 ℃, pH value of optimized community CJZ1 and CJZ2 increased by 0.76 and 0.66 compared with the initial value, respectively, and the degradation rate of straw increased by 0.47 and 0.25 percentage point compared with the original community, respectively, with no significant difference. In addition, the active peak of laccase and lignin peroxidase significantly decreased, while cellulase activity increased by 43.66% and 37.99%, hemicellulase activity increase by 21.40% and 12.91%, respectively in CJZ1 and CJZ2. The results could provide a new idea for the optimization of bacterial community, and a high quality bacterial community for the efficient degradation of straw at low temperature.

Key words: low temperature, straw, bacterial community, degradation rate, Lignin peroxidase, cellulase, hemicellulase

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