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Effect of heterotrophic ruminal bacteria on xylan metabolism by the anaerobic fungus Piromyces communis
Author(s) -
Williams A.G.,
Withers S.E.,
Naylor G.E.,
Joblin K.N.
Publication year - 1994
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.1994.tb00917.x
Subject(s) - biology , bacteria , rumen , xylose , xylanase , xylan , microbiology and biotechnology , biochemistry , streptococcus bovis , pectinase , fermentation , enzyme , genetics
Six rumen bacteria were cocultured with the rumen fungus Piromyces communis and the effects on xylanolysis determined. The rate and extent of xylan utilization was enhanced in cocultures with Prevotella ruminicola or Succinivibrio dextrinosolvens. The positive effects of Suc. dextrinosolvens and Prev. ruminicola on xylanolysis by P. communis correlated with effective cross‐feeding by the bacteria on arabinose and xylose released from xylan. Xylanolysis was not enhanced in cocultures of P. communis with Streptococcus bovis, Veillonella parvula or Ruminococcus flavefaciens. A comparison of fermentation product profiles and of extracellular enzyme activities showed that whereas saccharolytic species and Butyrivibrio fibrisolvens were dominant in cocultures, P. communis dominated in the culture with R. flavefaciens. Extracellular xylanase and β‐xylosidase activities were not increased by cocultivation of P. communis with any of the heterotrophic bacteria.