Potential interactions bacteria-brown algae

Mesquita, Michelle Marchezan Farias de; Crapez, Mírian Araújo Carlos; Teixeira, Valéria Laneuville; Cavalcanti, Diana Negrão

doi:10.1007/s10811-018-1573-4

Cited by 31 publications

(14 citation statements)

References 170 publications

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“…on brown seaweed leaf surfaces is of net beneficial or detrimental effects to the host. Some studies report that epiphytic bacteria of the genus Vibrio produce antimicrobial molecules 35 to protect the host against fouling and potentially pathogenic microorganisms since marine algae have no immune system of their own 45 . Other reports, however, report that some species of Vibrio are opportunistic pathogens, might cause disease to the host 12 .…”

Section: Discussionmentioning

confidence: 99%

Distribution, Interaction and Functional Profiles of Epiphytic Bacterial Communities from the Rocky Intertidal Seaweeds, South Africa

Selvarajan

Sibanda

Venkatachalam

et al. 2019

Sci Rep

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Interrelations between epiphytic bacteria and macroalgae are multifaceted and complicated, though little is known about the community structure, interaction and functions of those epiphytic bacteria. This study comprehensively characterized the epiphytic bacterial communities associated with eight different common seaweeds collected from a rocky intertidal zone on the Indian Ocean at Cape Vidal, South Africa. High-throughput sequencing analyses indicated that seaweed-associated bacterial communities were dominated by the phyla Proteobacteria, Bacteroidetes, Firmicutes, Cyanobacteria, Planctomycetes, Actinobacteria and Verrucomicrobia. Energy-dispersive X-ray (EDX) analysis showed the presence of elemental composition in the surface of examined seaweeds, in varying concentrations. Cluster analysis showed that bacterial communities of brown seaweeds (SW2 and SW4) were closely resembled those of green seaweeds (SW1) and red seaweeds (SW7) while those of brown seaweeds formed a separate branch. Predicted functional capabilities of epiphytic bacteria using PICRUSt analysis revealed abundance of genes related to metabolic and biosynthetic activities. Further important identified functional interactions included genes for bacterial chemotaxis, which could be responsible for the observed association and network of elemental-microbes interaction. The study concludes that the diversity of epiphytic bacteria on seaweed surfaces is greatly influenced by algal organic exudates as well as elemental deposits on their surfaces, which triggers chemotaxis responses from epiphytic bacteria with the requisite genes to metabolise those substrates.

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Section: Discussionmentioning

confidence: 99%

Distribution, Interaction and Functional Profiles of Epiphytic Bacterial Communities from the Rocky Intertidal Seaweeds, South Africa

Selvarajan

Sibanda

Venkatachalam

et al. 2019

Sci Rep

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“…MS6 strains release morphogenetic compounds and ensure proper thallus morphogenesis of Ulva mutabilis (Kessler et al 2018). Moreover, the surfaces of seaweeds also provide a habitat for microbial communities (Beleneva and Zhukova 2006;De Mesquita et al 2019). The cultivation area of economically important seaweeds in China comprised about 145,000 ha in 2017 (China Fishery Bureau 2018).…”

Section: Introductionmentioning

confidence: 99%

The cultivation of Pyropia haitanensis has important impacts on the seawater microbial community

Wang

et al. 2020

J Appl Phycol

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Microorganisms play important roles in the growth and development of macroalgae. Still, the biodiversity of the epiphytic microbial community associated with the economically important red alga Pyropia haitanensis during the cultivation period remains uncharacterized, especially the effects of P. haitanensis cultivation on the microbial community of surrounding seawater. Here, we isolated epiphytic microbes from P. haitanensis during the thallus stage during oceanic cultivation and the conchocelis stage during industrial cultivation. The dynamic diversity patterns, as determined by 16S and 18S rRNA gene sequencing of the bacterial and fungal communities, respectively, associated with P. haitanensis and seawater in the presence and absence of algal cultivation were investigated. A notable distinction was observed between the microbial communities of seawater with and without P. haitanensis cultivation. Additionally, the alpha-diversity of seawater with P. haitanensis cultivation was significantly greater than without P. haitanensis cultivation. Cyanobacteria were the dominant species in the latter, while Rhodobacteraceae was enriched in the former. Furthermore, there were significant differences in the microbial community of P. haitanensis at the thallus and conchocelis stages. Seawater properties had significant direct effects on the microbial diversity of P. haitanensis and cultivation seawater, but not on non-cultivation seawater. The enriched microbial presence might promote thallus morphogenesis and be beneficial for the growth and development of both the thallus and conchocelis stages. These findings expand our knowledge of the bacteria and fungi that are beneficial for Pyropia nursery seeding and cultivation, as well as the effects of P. haitanensis cultivation on the seawater microbial community.

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“…A portion of this photosynthetic product is released into the surrounding environment (Bertilsson & Jones, 2003) where it serves as a source of energy for heterotrophic microorganisms, including bacteria (Cole, 1982; Francoeur et al., 2020; Kuehn et al., 2014; Wyatt & Rober, 2020) and fungi (Halvorson et al., 2019; Kuehn et al., 2014; Wyatt et al., 2019). These decomposers, in turn, convert organic nutrients into inorganic forms, making them available for uptake by resource‐limited algae (Daufresne & Loreau, 2001; Kuehn et al., 2014; Mesquita et al., 2019). This reciprocal exchange of resources forms the basis for microbial resource cycling in aquatic ecosystems and is generally considered to be the interaction upon which producer–decomposer coexistence within biofilms depends (Daufresne & Loreau, 2001).…”

Section: Introductionmentioning

confidence: 99%

Carbon subsidies shift a northern peatland biofilm community towards heterotrophy in low but not high nutrient conditions

2020

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Producer–decomposer interactions within aquatic biofilms can range from mutualistic associations to competition depending on available resources. The outcomes of such interactions have implications for biogeochemical cycling and, as such, may be especially important in northern peatlands, which are a global carbon sink and are expected to experience changes in resource availability with climate change. The purpose of this study was to evaluate the effects of nutrients and organic carbon on the relative proportion of primary producers (microalgae) and heterotrophic decomposers (bacteria and fungi) during aquatic biofilm development in a boreal peatland. Given that decomposers are often better competitors for nutrients than primary producers in aquatic ecosystems, we predicted that labile carbon subsidies would shift the biofilm composition towards heterotrophy owing to the ability of decomposers to outcompete primary producers for available nutrients in the absence of carbon limitation. We manipulated nutrients (nitrate and phosphate) and organic carbon (glucose) in a full factorial design using nutrient‐diffusing substrates in an Alaskan fen. Heterotrophic bacteria were limited by organic carbon and algae were limited by inorganic nutrients. However, the outcomes of competitive interactions depended on background nutrient levels. Heterotrophic bacteria were able to outcompete algae for available nutrients when organic carbon was elevated and nutrient levels remained low, but not when organic carbon and nutrients were both elevated through enrichment. Fungal biomass was significantly lower in the presence of glucose alone, possibly owing to antagonistic interactions with heterotrophic bacteria. In contrast to bacteria, fungi were stimulated along with algae following nutrient enrichment. The decoupling of algae and heterotrophic bacteria in the presence of glucose alone shifted the biofilm trophic status towards heterotrophy. This effect was overturned when nutrients were enriched along with glucose, owing to a subsequent increase in algal biomass in the absence of nutrient limitation. By measuring individual components of the biofilm and obtaining data on the trophic status, we have begun to establish a link between resource availability and biofilm formation in northern peatlands. Our results show that labile carbon subsidies from outside sources have the potential to disrupt microbial coupling and shift the metabolic balance in favour of heterotrophy. The extent to which this occurs in the future will probably depend on the timing and composition of bioavailable nutrients delivered to surface waters with environmental change (e.g. permafrost thaw).

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Potential interactions bacteria-brown algae

Cited by 31 publications

References 170 publications

Distribution, Interaction and Functional Profiles of Epiphytic Bacterial Communities from the Rocky Intertidal Seaweeds, South Africa

Distribution, Interaction and Functional Profiles of Epiphytic Bacterial Communities from the Rocky Intertidal Seaweeds, South Africa

The cultivation of Pyropia haitanensis has important impacts on the seawater microbial community

Carbon subsidies shift a northern peatland biofilm community towards heterotrophy in low but not high nutrient conditions

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