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Bombyx mori  L. (Lepidoptera: Bombycidae) have been domesticated and widely used for silk production. It feeds on mulberry leaves. Mulberry leaves are mainly composed of pectin, xylan, cellulose and starch. Some of the digestive enzymes that degrade these carbohydrates might be produced by gut bacteria. Eleven isolates were obtained from the digestive tract of  B. mori , including the Gram positive  Bacillus circulans  and Gram negative  Proteus vulgaris, Klebsiella pneumoniae, Escherichia coli, Citrobacter freundii, Serratia liquefaciens, Enterobacter  sp.,  Pseudomonas fluorescens, P. aeruginosa, Aeromonas  sp., and  Erwinia  sp.. Three of these isolates,  P. vulgaris, K. pneumoniae, C. freundii , were cellulolytic and xylanolytic,  P. fluorescens  and  Erwinia  sp., were pectinolytic and  K. pneumoniae  degraded starch.  Aeromonas sp . was able to utilize the CMcellulose and xylan.  S. liquefaciens  was able to utilize three polysaccharides including CMcellulose, xylan and pectin.  B. circulans  was able to utilize all four polysaccharides with different efficacy. The gut of  B. mori  has an alkaline pH and all of the isolated bacterial strains were found to grow and degrade polysaccharides at alkaline pH. The number of cellulolytic bacteria increases with each instar.

journal of insect science

Isolation and Characterization of Bacteria from the Gut of<i>Bombyx mori</i>that Degrade Cellulose, Xylan, Pectin and Starch and Their Impact on Digestion

Isolation and Characterization of Bacteria from the Gut ofBombyx morithat Degrade Cellulose, Xylan, Pectin and Starch and Their Impact on Digestion