ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (11): 2294-2300.doi: 10.11843/j.issn.0366-6964.2016.11.018

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Isolation and Identification of Four Cellulolytic Bacteria Strains from Sheep Rumen and Cellulose Degradation Characteristics

WANG Wei-yun, LI Da-biao*, YU Yong-qiang, XING Yuan-yuan, LI Zi-jian   

  1. (College of Animal Science, Inner Mongolia Agricultural University,Hohhot 010018,China)
  • Received:2016-05-19 Online:2016-11-23 Published:2016-11-23

Abstract:

Four cellulose-degrading rumen bacteria strains were isolated from Mongolia sheep. The four strains bacteria were identified and numbered as H1, H2, N1 and N2. The growth characteristics and cellulase activity were measured to provide experimental material for subsequent experiments. Bacterial morphological, physiological and biochemical characterization, DNA sequence homology analysis were used for identification of isolated strains. Growth curve of strains were measured by using spectrophotometer. Filter paper enzyme activity, CMCase activity, salicin enzyme activity and microcrystalline cellulose enzyme activity of four strains of cellulolytic bacteria were measured by using reducing sugar method. Two strains of bacteria H1, H2 were identified as Ruminococcus flavefaciens and N1, N2 were Streptococcus. The growth curves of four strains showed that lag phase of H1, H2, N1, N2 were 3-4 h and the maximum cell concentration of H1, H2 appeared in 28 h and N1, N2 appeared in 14 h. Four strains of bacteria had high activity of filter paper enzyme. The activity of filter paper enzyme, CMCase and microcrystalline cellulose enzyme were significantly higher for H2 than for H1, N1 and N2 (P<0.05). Filter paper enzyme activity of H1 was 0.08 μmol•(mL•min ) -1 and was lowest among four strains. Four strains bacteria with cellulose enzyme activity were isolated by using the method of roll tube technique. These four cellulolytic bacteria strains can be used for subsequent study.

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