Photobacterium spp. occur frequently in marine environments but have been recently also found as common spoilers on chilled meats. The environmental conditions in these ecological niches differ especially regarding salinity and ambient pressure. Linking the occurrence of photobacteria in different niches may elucidate its ecology and bring insights for the food industry. We investigated tolerance of Photobacterium (P.) phosphoreum and P. carnosum strains to high hydrostatic pressure and salinity and aligned our observations with presence of relevant genes. The strains were isolated from packaged meats and salmon (or the sea) to identify adaptations to marine and terrestrial habitats. Growth of all P. carnosum strains was reduced by 40 MPa hydrostatic pressure and >3% sodium chloride, suggesting loss of traits associated with marine habitats. In contrast, P. phosphoreum strains were only slightly affected, suggesting general adaptation to marine habitats. In accordance, these strains had gene clusters associated with marine niches, e.g. flagellar and lux-operons, being incomplete in P. carnosum. Occurrence of P. carnosum strains on packaged salmon and P. phosphoreum strains on meats therefore likely results from cross-contamination in meat and fish processing. Still, these strains showed intermediate traits regarding pressure- and halotolerance, suggesting developing adaptation to their respective environment.

光杆菌属 经常发生在海洋环境中，但最近也被发现是冷藏肉类的常见破坏剂。这些生态位的环境条件不同，尤其是在盐度和环境压力方面。将光细菌在不同生态位中的发生联系起来可以阐明其生态学并为食品行业带来见解。我们研究了磷光杆菌 (P.)和P. carnosum菌株对高静水压力和盐度的耐受性，并将我们的观察结果与相关基因的存在对齐。这些菌株是从包装好的肉类和鲑鱼（或海洋）中分离出来的，以确定对海洋和陆地栖息地的适应性。所有P. carnosum 的生长菌株减少了 40 MPa 的静水压力和 >3% 的氯化钠，表明与海洋栖息地相关的性状丧失。相比之下，磷虾菌株仅受到轻微影响，表明对海洋栖息地的普遍适应。因此，这些菌株具有与海洋生态位相关的基因簇，例如鞭毛和勒克斯操纵子，在P. carnosum 中是不完整的。的发生P. carnosum上包装鲑鱼和菌株发光菌上肉类因此从肉类和鱼类加工交叉污染可能的结果的菌株。尽管如此，这些菌株在耐压和耐盐方面表现出中间特征，表明正在发展对各自环境的适应。