Bacterial Communities Associated With Healthy and Diseased (Skeletal Growth Anomaly) Reef Coral Acropora cytherea From Palk Bay, India

Rajasabapathy, Raju; Ramasamy, Kesava Priyan; Balakrishnan, M.; Mohandass, Chellandi; James, Rathinam Arthur

doi:10.3389/fmars.2020.00092

Cited by 16 publications

(9 citation statements)

References 57 publications

(78 reference statements)

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“…Previous studies have shown differences in bacterial communities between bleached and healthy organisms including corals and non-calcified macroalgae. The presence of some potential pathogens (i.e., Vibrio shilonii , Nautella italica R11, and Phaeobacter gallaeciensis LSS9) is related to bleaching disease ( Kushmaro et al, 1996 ; Meron et al, 2011 ; Zozaya-Valdes et al, 2015 ; Rajasabapathy et al, 2020 ). To date, reports of microbial community variations between healthy and bleached CCA are very limited.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Communities Associated With Healthy and Bleached Crustose Coralline Alga Porolithon onkodes

et al. 2021

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Crustose coralline algae (CCA) play vital roles in producing and stabilizing reef structures and inducing the settlement and metamorphosis of invertebrate larvae in coral reef ecosystems. However, little is known about the bacterial communities associated with healthy and bleached CCA and their interactions with coral larval settlement. We collected samples of healthy, middle semi-bleached, and bleached CCA Porolithon onkodes from Sanya Bay in the South China Sea and investigated their influences on the larval settlement and metamorphosis of the reef-building coral Pocillopora damicornis. The larval settlement/metamorphosis rates all exceeded 70% when exposed to healthy, middle semi-bleached, and bleached algae. Furthermore, the compositions of bacterial community using amplicon pyrosequencing of the V3–V4 region of 16S rRNA were investigated. There were no obvious changes in bacterial community structure among healthy, middle semi-bleached, and bleached algae. Alphaproteobacteria, Bacteroidetes, and Gammaproteobacteria were dominant in all samples, which may contribute to coral larval settlement. However, the relative abundances of several bacterial communities varied among groups. The relative abundances of Mesoflavibacter, Ruegeria, Nautella, and Alteromonas in bleached samples were more than double those in the healthy samples, whereas Fodinicurvata and unclassified Rhodobacteraceae were significantly lower in the bleached samples. Additionally, others at the genus level increased significantly from 8.5% in the healthy samples to 22.93% in the bleached samples, which may be related to algal bleaching. These results revealed that the microbial community structure associated with P. onkodes generally displayed a degree of stability. Furthermore, bleached alga was still able to induce larval settlement and metamorphosis.

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Section: Introductionmentioning

confidence: 99%

Bacterial Communities Associated With Healthy and Bleached Crustose Coralline Alga Porolithon onkodes

et al. 2021

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“…In addition, the coral core microbiome, which includes rare bacterial taxa, has been identified as ubiquitous endosymbionts [10]. Many studies support the notion that the microbiome of corals is distinct from that of the overlying seawater, and that bacterial communities supported by corals fluctuate with the season [9,11] and are host-specific [12,13], geographically consistent [6], and physiologic [14,15]. Nevertheless, the number of bacterial strains isolated from coral is very small [9,16], and their specific physiological roles have not been fully elucidated.…”

Section: Introductionmentioning

confidence: 99%

High Diversity of β-Glucosidase-Producing Bacteria and Their Genes Associated with Scleractinian Corals

Xiao

et al. 2021

IJMS

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β-Glucosidase is a microbial cellulose multienzyme that plays an important role in the regulation of the entire cellulose hydrolysis process, which is the rate-limiting step in bacterial carbon cycling in marine environments. Despite its importance in coral reefs, the diversity of β-glucosidase-producing bacteria, their genes, and enzymatic characteristics are poorly understood. In this study, 87 β-glucosidase-producing cultivable bacteria were screened from 6 genera of corals. The isolates were assigned to 21 genera, distributed among three groups: Proteobacteria, Firmicutes, and Actinobacteria. In addition, metagenomics was used to explore the genetic diversity of bacterial β-glucosidase enzymes associated with scleractinian corals, which revealed that these enzymes mainly belong to the glycosidase hydrolase family 3 (GH3). Finally, a novel recombinant β-glucosidase, referred to as Mg9373, encompassing 670 amino acids and a molecular mass of 75.2 kDa, was classified as a member of the GH3 family and successfully expressed and characterized. Mg9373 exhibited excellent tolerance to ethanol, NaCl, and glucose. Collectively, these results suggest that the diversity of β-glucosidase-producing bacteria and genes associated with scleractinian corals is high and novel, indicating great potential for applications in the food industry and agriculture.

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“…Remarkably, some species of the genus Photobacterium (Photobacterium rosenbergii) that were cultivated at the Public Beach site are known to be associated with coral bleaching [59]. Similarly, the level of putative pathogenic bacteria Klebsiella was higher in diseased stony corals (Acropora Cytherea (Dana, 1846)) from India [60]. These bacterial species may be originated from swimming activities and sewage discharge at the Public Beach.…”

Section: Discussionmentioning

confidence: 99%

Effect of Various Local Anthropogenic Impacts on the Diversity of Coral Mucus-Associated Bacterial Communities

Hussein

Juhmani

Jacob

et al. 2022

JMSE

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The global continued decline in coral reefs is intensifying the need to understand the response of corals to local environmental stressors. Coral-associated bacterial communities have been suggested to have a swift response to environmental pollutants. This study aims to determine the variation in the bacterial communities associated with the mucus of two coral species, Pocillopora damicornis (Linnaeus, 1758) and Stylophora pistillata (Esper, 1792), and the coral-surrounding seawater from three areas exposed to contamination at the Jordanian coast of the Gulf of Aqaba (Red Sea), and also explores the antibacterial activity of these bacteria. Corals were collected from three contaminated zones along the coast, and the bacteria were quantified and identified by conventional morphological and biochemical tests, as well as 16S rRNA gene sequencing. The average number of bacteria significantly varied among the coral mucus from the sampling zones and between the coral mucus and the surrounding seawater. The P. damicornis mucus-associated bacterial community was dominated by members of the classes Gammaproteobacteria, Cytophagia, and Actinomycetia, while the mucus of S. pistillata represented higher bacterial diversity, with the dominance of the bacterial classes Gammaproteobacteria, Actinomycetia, Alphaproteobacteria, and Bacilli. The effects of local anthropogenic impacts on coral mucus bacterial communities were represented in the increased abundance of bacterial species related to coral diseases. Furthermore, the results demonstrated the existence of bacterial isolates with antibacterial activity that possibly acted as a first line of defense to protect and maintain the coral host against pathogens. Indeed, the dynamics of coral-associated microbial communities highlight the importance of holistic studies that focus on microbial interactions across the coral reef ecosystem.

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Bacterial Communities Associated With Healthy and Diseased (Skeletal Growth Anomaly) Reef Coral Acropora cytherea From Palk Bay, India

Cited by 16 publications

References 57 publications

Bacterial Communities Associated With Healthy and Bleached Crustose Coralline Alga Porolithon onkodes

Bacterial Communities Associated With Healthy and Bleached Crustose Coralline Alga Porolithon onkodes

High Diversity of β-Glucosidase-Producing Bacteria and Their Genes Associated with Scleractinian Corals

Effect of Various Local Anthropogenic Impacts on the Diversity of Coral Mucus-Associated Bacterial Communities

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