Antimicrobial activity of Red Sea corals

Kelman, Dovi; Kashman, Yoel; Rosenberg, Eugene; Kushmaro, Ariel; Loya, Yossi

doi:10.1007/s00227-005-0218-8

Cited by 98 publications

(90 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It may be concluded that coral-generated habitats under natural conditions are associated with rather OTU-poor, but specific, bacterial communities. The selection of such bacterial associates could be induced by nutritional coral-microbe relationships, as coral exudates are known to attract specific, yet diverse populations of organo-heterotrophs (Ritchie and Smith, 2004;Allers et al, 2008), or by specific chemical mediation by the coral host (Kelman et al, 2006;Ritchie, 2006). Our findings are consistent with results from other studies that found specific associations between bacteria and their coral hosts (Rohwer et al, 2002;Bourne and Munn, 2005;Penn et al, 2006;Yakimov et al, 2006;Webster and Bourne, 2007).…”

Section: Resultssupporting

confidence: 90%

Inter- and intra-habitat bacterial diversity associated with cold-water corals

et al. 2009

View full text Add to dashboard Cite

The discovery of large ecosystems of cold-water corals (CWC), stretching along continental margins in depths of hundreds to thousands of meters, has raised many questions regarding their ecology, biodiversity and relevance as deep-sea hard-ground habitat. This study represents the first investigation that explicitly targets bacterial diversity from distinct microbial habitats associated with the cosmopolitan reef-building coral Lophelia pertusa, and also compares natural (fjord) and controlled (aquarium) conditions. Coral skeleton surface, coral mucus, ambient seawater and reef sediments clearly showed habitat-specific differences in community structure and operational taxonomic unit (OTU) number. Especially in the natural environment, bacterial communities associated with coral-generated habitats were significantly more diverse than those present in the surrounding, non-coral habitats, or those in artificial coral living conditions (fjord vs aquarium). These findings strongly indicate characteristic coral-microbe associations and, furthermore, suggest that the variety of coral-generated habitats within reef systems promotes microbial diversity in the deep ocean.

show abstract

Section: Resultssupporting

confidence: 90%

Inter- and intra-habitat bacterial diversity associated with cold-water corals

et al. 2009

View full text Add to dashboard Cite

show abstract

“…One of the important traits that is thought to be contributed by the microbial community and can influence the coral host is the production of antibacterial agents (Kelman et al, 2006;Nithyanand and Pandian, 2009;Rypien et al, 2009;Shnit-Orland and Kushmaro, 2009). We examined the ability of the isolated bacterial community to produce antibacterial activity against five bacterial species (including a coral bleaching pathogen) and detected an increase from 17 to 42% in the percent of coral bacteria showing antibacterial activity following a decrease in pH.…”

Section: Discussionmentioning

confidence: 99%

The impact of reduced pH on the microbial community of the coral Acropora eurystoma

et al. 2010

View full text Add to dashboard Cite

Rising concentrations of atmospheric carbon dioxide are acidifying the world's oceans. Surface seawater pH is 0.1 units lower than pre-industrial values and is predicted to decrease by up to 0.4 units by the end of the century. This change in pH may result in changes in the physiology of ocean organisms, in particular, organisms that build their skeletons/shells from calcium carbonate, such as corals. This physiological change may also affect other members of the coral holobiont, for example, the microbial communities associated with the coral, which in turn may affect the coral physiology and health. In the present study, we examined changes in bacterial communities in the coral mucus, tissue and skeleton following exposure of the coral Acropora eurystoma to two different pH conditions: 7.3 and 8.2 (ambient seawater). The microbial community was different at the two pH values, as determined by denaturing gradient gel electrophoresis and 16S rRNA gene sequence analysis. Further analysis of the community in the corals maintained at the lower pH revealed an increase in bacteria associated with diseased and stressed corals, such as Vibrionaceae and Alteromonadaceae. In addition, an increase in the number of potential antibacterial activity was recorded among the bacteria isolated from the coral maintained at pH 7.3. Taken together, our findings highlight the impact that changes in the pH may have on the coral-associated bacterial community and their potential contribution to the coral host.

show abstract

“…The antimicrobial activity of the extractives was determined by the disc diffusion method (Bauer et al, 1966;Inouye et al, 2001;Kelman et al, 2006;Mbwambo et al, 2007;Mayachiew and Devahastin, 2008;Rahman and Rashid, 2008). The samples were dissolved separately in a suitable solrent (chloroform or methanol) and applied to sterile discs at a concentration of 300 µg/disc and carefully dried to evaporate the residual solvent.…”

Section: Bioassaysmentioning

confidence: 99%

Preliminary antimicrobial and cytotoxic activities of Amoora cucullata extractives

Rahman¹,

Rashid²

2009

Oriental Pharmacy and Experimental Medicine

View full text Add to dashboard Cite

SUMMARYAmoora cucullata (Meliaceae), a mangrove plant, has folkloric reputation as a medicinal agent in Bangladesh. In this study, the n-hexane, ethyl acetate and methanolic extracts of the stem bark of this plant were subjected to microbiological investigation and brine shrimp lethality bioassay. In case of antimicrobial screening, the ethyl acetate and methanolic extracts appeared to be potent in terms of both zone of inhibition and spectrum of activity showing the average zones of inhibition 8 -14 mm and 9 -16 mm, respectively. In the brine shrimp lethality bioassay, the methanolic extract demonstrated highest cytotoxicity having LC 5 0 of 0.549 µg/ml, whereas the ethyl acetate and n-hexane extract showed LC 5 0 of 7.943 and 17.180 µg/ml, respectively.

show abstract

Antimicrobial activity of Red Sea corals

Cited by 98 publications

References 44 publications

Inter- and intra-habitat bacterial diversity associated with cold-water corals

Inter- and intra-habitat bacterial diversity associated with cold-water corals

The impact of reduced pH on the microbial community of the coral Acropora eurystoma

Preliminary antimicrobial and cytotoxic activities of Amoora cucullata extractives

Contact Info

Product

Resources

About