In situ grazing resistance of Vibrio cholerae in the marine environment

摘要: Previous laboratory experiments revealed that Vibrio cholerae A1552 biofilms secrete an antiprotozoal factor prevents Rhynchomonas nasuta from growing and thus grazing losses. The is regulated by the quorum-sensing response regulator, HapR. Here, we investigate whether activity ecologically relevant. Experiments were conducted in field as well under field-like conditions to assess resistance of V. N16961 (natural frameshift mutation hapR) R. Cafeteria roenbergensis. In exposing predators grown seawater containing high low glucose concentrations, determined showed increased towards both levels decreased. relative strains grazers semi-field was similar observed situ. Therefore, antipredator defense environmentally relevant not lost when are open system marine environment. hapR mutant still exhibited some this suggests may coordinate defenses a combination density-dependent regulation environmental sensing protect itself its natural habitat.