Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1007/s10532-007-9149-z
Volltext Shareable Link
Titel (primär) Microbial community shifts as a response to efficient degradation of chlorobenzene under hypoxic conditions
Autor Kiesel, B.; Balcke, G.U.; Dietrich, J.; Vogt, C.; Geyer, R.
Quelle Biodegradation
Erscheinungsjahr 2008
Department ISOBIO; UMB; HDG
Band/Volume 19
Heft 3
Seite von 435
Seite bis 446
Sprache englisch
Keywords Chlorobenzene; Hypoxic; Kinetics; Microaerophilic; Catechol dioxygenase
Abstract Limitations in the availability of oxygen restrict aerobic biodegradation of chloroaromatic compounds in groundwater ecosystems. In this context the activity of ring-cleaving chlorocatechol dioxygenases (CC12O) is crucial for effective mineralization. Previously we demonstrated that oxygen-related enzyme characteristics of CC12O can vary widely among the Proteobacteria (Balcke et al. submitted). Here, we investigated how strains with different ability to transform intermediary 3-chlorocatechol integrate into biodegradation of chlorobenzene (CB) under low or high oxygen availability. Pseudomonas veronii UFZ B549 and Acidovorax facilis UFZ B530, which had differing oxygen affinities for CC12O, were mixed together at different proportions (20:80; 80:20), and compared for degradation of chlorobenzene under oxic (215 µM O2) and hypoxic (11 µM O2) conditions. Changes in community composition in binary mixed cultures were determined and compared with an indigenous groundwater community, cultivated under comparable conditions. Community shifts were determined by FISH (fluorescent in situ hybridization) in our model system and SSCP (single stranded conformation polymorphism) fingerprinting in the groundwater community, as well as by analysis of respiratory quinones of taxonomic value. Hypoxia led to enrichment of Acidovoracae in the groundwater and binary cultures. Under hypoxic conditions cis,cis-2-chloromuconate released to the medium by A. facilis allowed for concomitant growth of P. veronii, although its low-affinity type CC12O would not imply growth on CB. Vice versa, increasing abundance of P. veronii induced intermediary 3-chlorocatechol accumulation, which was reduced by growth of A. facilis. Thus, reduced oxygen availability caused syntrophic rather than competitive interactions.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=1093
Kiesel, B., Balcke, G.U., Dietrich, J., Vogt, C., Geyer, R. (2008):
Microbial community shifts as a response to efficient degradation of chlorobenzene under hypoxic conditions
Biodegradation 19 (3), 435 - 446 10.1007/s10532-007-9149-z