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Low densities of epiphytic bacteria from the marine alga Ulva australis inhibit settlement of fouling organisms.

Abstract：

: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 inhibitory compounds against common fouling organisms. P. tunicata and Phaeobacter sp. strain 2.10 biofilms with cell densities ranging from 10(2) to 10(8) cells cm(-2) were established on polystyrene petri dishes. Attachment and settlement assays were performed with marine fungi (uncharacterized isolates from U. australis), marine bacteria (Pseudoalteromonas gracilis, Alteromonas sp., and Cellulophaga fucicola), invertebrate larvae (Bugula neritina), and algal spores (Polysiphonia sp.) and gametes (U. australis). Remarkably low cell densities (10(2) to 10(3) cells cm(-2)) of P. tunicata were effective in preventing settlement of algal spores and marine fungi in petri dishes. P. tunicata also prevented settlement of invertebrate larvae at densities of 10(4) to 10(5) cells cm(-2). Similarly, low cell densities (10(3) to 10(4)cells cm(-2)) of Phaeobacter sp. strain 2.10 had antilarval and antibacterial activity. Previously, it has been shown that abundance of P. tunicata on marine eukaryotic hosts is low (<1 x 10(3) cells cm(-2)) (T. L. Skovhus et al., Appl. Environ. Microbiol. 70:2373-2382, 2004). Despite such low numbers of P. tunicata on U. australis in situ, our data suggest that P. tunicata and Phaeobacter sp. strain 2.10 are present in sufficient quantities on the plant to inhibit fouling organisms. This strongly supports the hypothesis that P. tunicata and Phaeobacter sp. strain 2.10 can play a role in defense against fouling on U. australis at cell densities that commonly occur in situ.

journal_name

Appl Environ Microbiol

journal_title

Applied and environmental microbiology

authors

Rao D,Webb JS,Holmström C,Case R,Low A,Steinberg P,Kjelleberg S

doi

10.1128/AEM.01543-07

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

7844-52

issue

eissn

0099-2240

issn

1098-5336

pii

AEM.01543-07

journal_volume

pub_type

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Low densities of epiphytic bacteria from the marine alga Ulva australis inhibit settlement of fouling organisms.