Salinity and macrophyte drive the biogeography of the sedimentary bacterial communities in a brackish water tropical coastal lagoon

Behera, Pratiksha; Mahapatra, Sofia; Mohapatra, Madhusmita Mohanty; Kim, Ji Yoon; Adhya, T. K.; Raina, Vishakha; Suar, Mrutyunjay; Pattnaik, Ajit K.; Rastogi, Gurdeep

doi:10.1016/j.scitotenv.2017.03.271

Cited by 63 publications

(33 citation statements)

References 78 publications

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“…Proteobacteria has been recognized as the most abundant phylum and is consistently enriched in the rhizosphere of seagrass compared to bulk sediment (Cúcio et al, 2016;Ettinger et al, 2017;Behera et al, 2017). Proteobacteria members are well-known root colonizers and respond positively to low-molecular-weight substrates, which are abundant in root exudates (Fierer et al, 2007;Goldfarb et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Lennon and Jones (2011) noted that the physicochemical properties of the soil, together with plant species, dominated which members of microorganisms can grow and thrive. A large number of studies have suggested that the host plant plays a major determining role in structuring the composition of its rhizosphere microbiota (Aleklett et al, 2015;Behera et al, 2017). The popular notion indicated that this selective effect of a host plant is a direct result of plant-microbe interactions due to the unique composition of root exudates.…”

Section: Introductionmentioning

confidence: 99%

“…A great deal of studies has focused on investigating specific root colonizers in rhizosphere sediments (Walker et al, 2003;Bais et al, 2006). Members of the phylum Proteobacteria commonly respond positively to plant roots (Bulgarelli et al, 2012;Peiffer et al, 2013), as they can utilize a variety of low-molecularweight substrates as electron accepters, which are abundant in plant root exudates (Goldfarb et al, 2011;Behera et al, 2017). Furthermore, on account of seagrasses growing in largely anoxic, reduced marine sediments (Borum et al, 2005) that are often enriched in the potent phytotoxin H 2 S, hence, the rhizosphere of these plants is dominated by bacteria involved in the sulfur cycle (Jensen et al, 2007;Cúcio et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Rhizosphere Microbial Community Structure Is Selected by Habitat but Not Plant Species in Two Tropical Seagrass Beds

Zhang

Zhao

et al. 2020

Front. Microbiol.

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Rhizosphere bacterial community structures and their determining drivers have been studied in a variety of marine and freshwater ecosystems for a range of plant species. However, there is still limited information about the influence of habitat on microbial communities in seagrass beds. This study aimed to determine which factors (habitat and plant species) have crucial roles on the rhizospheric bacteria associated with two tropical seagrass species (Thalassia hemprichii and Enhalus acoroides) that are dominant at Xincun Bay and Tanmen Harbor in Hainan Island, South China. Using Illumina HiSeq sequencing, we observed substantial differences in the bacterial richness, diversity, and relative abundances of taxa between the two habitats, which were characterized differently in sediment type and nutrient status. Rhizospheric bacteria from sandy sediment at the eutrophic Xincun Bay were dominated by Desulfobacteraceae and Helicobacteraceae, which are primarily involved in sulfate cycling, whereas rhizosphere microbes from the reef flat at oligotrophic Tanmen Harbor were dominated by Vibrionaceae and Woeseiaceae, which may play important roles in nitrogen and carbon fixing. Additionally, we speculated that host-specific effects of these two seagrass species may be covered under nutrient-rich conditions and in mixed community patches, emphasizing the importance of the nutrient status of the sediment and vegetation composition of the patches. In addition, our study confirmed that Proteobacteria was more adapted to the rhizosphere environment than to lowcarbon conditions that occurred in bulk sediment, which was primarily dominated by well-known fermentative bacteria in the phylum Firmicutes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rhizosphere Microbial Community Structure Is Selected by Habitat but Not Plant Species in Two Tropical Seagrass Beds

Zhang

Zhao

et al. 2020

Front. Microbiol.

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“…Likewise, they observed archaeal Shannon values between 7.51 and 7.93, while we observed 2.38. A study of a brackish lagoon in the Bay of Bengal [45] reported an average inverse Simpson score of 169 and~13,000 sequences per sample, compared to 1305 sequences and an average inverse Simpson score of 42 for our data. While some of these differences could be attributable to different sizes of datasets, the low observed richness and diversity within saltpan sediments likely reflect true, highly restrictive conditions.…”

Section: Discussionmentioning

confidence: 47%

The Saltpan Microbiome Is Structured by Sediment Depth and Minimally Influenced by Variable Hydration

2020

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Saltpans are a class of ephemeral wetland characterized by alternating periods of inundation, rising salinity, and desiccation. We obtained soil cores from a saltpan on the Mississippi Gulf coast in both the inundated and desiccated state. The microbiomes of surface and 30 cm deep sediment were determined using Illumina sequencing of the V4 region of the 16S rRNA gene. Bacterial and archaeal community composition differed significantly between sediment depths but did not differ between inundated and desiccated states. Well-represented taxa included marine microorganisms as well as multiple halophiles, both observed in greater proportions in surface sediment. Functional inference of metagenomic data showed that saltpan sediments in the inundated state had greater potential for microbial activity and that several energetic and degradation pathways were more prevalent in saltpan sediment than in nearby tidal marsh sediment. Microbial communities within saltpan sediments differed in composition from those in adjacent freshwater and brackish marshes. These findings indicate that the bacterial and archaeal microbiomes of saltpans are highly stratified by sediment depth and are only minimally influenced by changes in hydration. The surface sediment community is likely isolated from the shallow subsurface community by compaction, with the microbial community dominated by marine and terrestrial halophiles.

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“…With the development of high-throughput sequencing technology, 16S rRNA gene sequencing has provided a deeper understanding of aquatic plant rhizosphere microbiota. Thus, more taxa of rhizosphere-associated microbiota have been shown to contribute to the processes of pollutant degradation and plant fitness in wetlands [4,12]. Some studies have also shown that the species and lineages of aquatic plants play a crucial role in the distribution and composition of microbial communities [4,13,14].…”

Section: Introductionmentioning

confidence: 99%

Aquatic Macrophytes and Local Factors Drive Bacterial Community Distribution and Interactions in a Riparian Zone of Lake Taihu

Lyu

Huang

Zeng

et al. 2020

Water

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Aquatic macrophytes rhizosphere are biogeochemical cycling hotspots in freshwater ecosystems. However, little is known regarding the effect of aquatic macrophytes on bacterial community and interactions in the riparian zones. We investigated the bacterial community composition and network structures along a gradient of the riparian zone as follows: The supralittoral and eulittoral zones with Phragmites australis, the eulittoral and infralittoral zones without P. australi. The bacterial communities in the four zones differed significantly based on taxonomic dissimilarity, but the two zones with P. australis exhibited phylogenetic closeness of the bacterial communities. The characteristics of the bacterial networks, such as connectivity, modularity, and topological roles of OTUs, were totally different between the P. australis and non-P. australis zones. Some bacterial phyla enriched in the P. australis zones were found to be putative keystone taxa in the networks, which might be involved in the regulation of bacterial interactions and plant growth. Moreover, the hydrological regime and particle size were shown to be determinants of the bacterial community and network structures in the riparian zones. In summary, our results show that the role of P. australis and local factors are crucial for constructing bacterial community and interactions in the riparian zones of lakes.

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Salinity and macrophyte drive the biogeography of the sedimentary bacterial communities in a brackish water tropical coastal lagoon

Cited by 63 publications

References 78 publications

Rhizosphere Microbial Community Structure Is Selected by Habitat but Not Plant Species in Two Tropical Seagrass Beds

Rhizosphere Microbial Community Structure Is Selected by Habitat but Not Plant Species in Two Tropical Seagrass Beds

The Saltpan Microbiome Is Structured by Sediment Depth and Minimally Influenced by Variable Hydration

Aquatic Macrophytes and Local Factors Drive Bacterial Community Distribution and Interactions in a Riparian Zone of Lake Taihu

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