| bacterial community assembly based on functional genes rather than species. | the principles underlying the assembly and structure of complex microbial communities are an issue of long-standing concern to the field of microbial ecology. we previously analyzed the community membership of bacterial communities associated with the green macroalga ulva australis, and proposed a competitive lottery model for colonization of the algal surface in an attempt to explain the surprising lack of similarity in species composition across different algal samples. here we extend the prev ... | 2011 | 21825123 |
| an ortholog of the leptospira interrogans lipoprotein lipl32 aids in the colonization of pseudoalteromonas tunicata to host surfaces. | the bacterium pseudoalteromonas tunicata is a common surface colonizer of marine eukaryotes, including the macroalga ulva australis.genomic analysis of p. tunicata identified genes potentially involved in surface colonization, including genes with homology to bacterial virulence factors that mediate attachment. of particular interest is the presence of a gene, designated ptll32, encoding an ortholog to the leptospira lipoprotein lipl32, which has been shown to facilitate the interaction of lepto ... | 2014 | 25071736 |
| marine bacteria from danish coastal waters show antifouling activity against the marine fouling bacterium pseudoalteromonas sp. strain s91 and zoospores of the green alga ulva australis independent of bacteriocidal activity. | the aims of this study were to determine if marine bacteria from danish coastal waters produce antifouling compounds and if antifouling bacteria could be ascribed to specific niches or seasons. we further assess if antibacterial effect is a good proxy for antifouling activity. we isolated 110 bacteria with anti-vibrio activity from different sample types and locations during a 1-year sampling from danish coastal waters. the strains were identified as pseudoalteromonas, phaeobacter, and vibrionac ... | 2011 | 22003011 |
| ability of pseudoalteromonas tunicata to colonize natural biofilms and its effect on microbial community structure. | we investigated the effectiveness of surface colonization by the epiphytic marine bacterium pseudoalteromonas tunicata firstly on a complex biofilm community on glass slides, and secondly, on the epiphytic community of ulva australis. the effectiveness of p. tunicata was compared with the performance of phaeobacter sp. 2.10, also a marine epiphytic isolate in the u. australis colonization experiments. pseudoalteromonas tunicata cells were able to colonize the glass slide community at densities f ... | 2010 | 20579099 |
| variability and abundance of the epiphytic bacterial community associated with a green marine ulvacean alga. | marine ulvacean algae are colonized by dense microbial communities predicted to have an important role in the development, defense and metabolic activities of the plant. here we assess the diversity and seasonal dynamics of the bacterial community of the model alga ulva australis to identify key groups within this epiphytic community. a total of 48 algal samples of u. australis that were collected as 12 individuals at 3 monthly intervals, were processed by applying denaturing gradient gel electr ... | 2010 | 19829319 |
| antimicrobial activity observed among cultured marine epiphytic bacteria reflects their potential as a source of new drugs. | the surfaces of marine eukaryotes provide a unique habitat for colonizing microorganisms where competition between members of these communities and chemically mediated interactions with their host are thought to influence both microbial diversity and function. for example, it is believed that marine eukaryotes may use their surface-associated bacteria to produce bioactive compounds in defence against competition and to protect the host against further colonization. with the increasing need for n ... | 2009 | 19453738 |
| low densities of epiphytic bacteria from the marine alga ulva australis inhibit settlement of fouling organisms. | bacteria that produce inhibitory compounds on the surface of marine algae are thought to contribute to the defense of the host plant against colonization of fouling organisms. however, the number of bacterial cells necessary to defend against fouling on the plant surface is not known. pseudoalteromonas tunicata and phaeobacter sp. strain 2.10 (formerly roseobacter gallaeciensis) are marine bacteria often found in association with the alga ulva australis and produce a range of extracellular inhib ... | 2007 | 17965210 |
| a mannose-sensitive haemagglutinin (msha)-like pilus promotes attachment of pseudoalteromonas tunicata cells to the surface of the green alga ulva australis. | this study demonstrates that attachment of the marine bacterium pseudoalteromonas tunicata to the cellulose-containing surface of the green alga ulva australis is mediated by a mannose-sensitive haemagglutinin (msha-like) pilus. we have identified an msha pilus biogenesis gene locus in p. tunicata, termed msh/1/2jklmnegfbacdopq, which shows significant homology, with respect to its genetic characteristics and organization, to the msha pilus biogenesis gene locus of vibrio cholerae. electron micr ... | 2006 | 17005969 |
| inhibition of fungal colonization by pseudoalteromonas tunicata provides a competitive advantage during surface colonization. | the marine epiphytic bacterium pseudoalteromonas tunicata produces a range of extracellular secondary metabolites that inhibit an array of common fouling organisms, including fungi. in this study, we test the hypothesis that the ability to inhibit fungi provides p. tunicata with an advantage during colonization of a surface. studies on a transposon-generated antifungal-deficient mutant of p. tunicata, fm3, indicated that a long-chain fatty acid-coenzyme a ligase is involved in the production of ... | 2006 | 16957232 |
| microbial colonization and competition on the marine alga ulva australis. | pseudalteromonas tunicata and roseobacter gallaeciensis are biofilm-forming marine bacteria that are often found in association with the surface of the green alga ulva australis. they are thought to benefit the plant host by producing inhibitory compounds that are active against common fouling organisms. we investigated factors that influence the ability of p. tunicata and r. gallaeciensis to attach to and colonize the plant surface and also the competitive interactions that occur between these ... | 2006 | 16885308 |
| enhanced biofilm formation and increased resistance to antimicrobial agents and bacterial invasion are caused by synergistic interactions in multispecies biofilms. | most biofilms in their natural environments are likely to consist of consortia of species that influence each other in synergistic and antagonistic manners. however, few reports specifically address interactions within multispecies biofilms. in this study, 17 epiphytic bacterial strains, isolated from the surface of the marine alga ulva australis, were screened for synergistic interactions within biofilms when present together in different combinations. four isolates, microbacterium phyllosphaer ... | 2006 | 16751497 |
| epibacterium ulvae gen. nov., sp. nov., epibiotic bacteria isolated from the surface of a marine alga. | two gram-reaction-negative, rod-shaped, motile bacteria, designated strains u82 and u95(t), were isolated from the marine alga ulva australis collected at sharks point, clovelly, a rocky intertidal zone near sydney, australia. both strains were oxidase- and catalase-positive, formed brown- to black-pigmented colonies and required nacl for growth. phylogenetic analysis based on nearly complete 16s rrna gene sequences revealed that these strains belong to the roseobacter clade within the alphaprot ... | 2013 | 22904216 |