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The gastric caeca of pentatomids as a house foractinomycetes » Isaúde
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BMC microbiology [electronic resource]
2012-06-09 03:33:10

The gastric caeca of pentatomids as a house foractinomycetes

Descrição: Background:Microbes are extensively associated with insects, playing key roles in insect defense,nutrition and reproduction. Most of the associations reported involve Proteobacteria. Despitethe fact that Actinobacteria associated with insects were shown to produce antibiotic barriersagainst pathogens to the hosts or to their food and nutrients, there are few studies focusing ontheir association with insects. Thus, we surveyed the Actinobacteria diversity on a specificregion of the midgut of seven species of stinkbugs (Hemiptera: Pentatomidae) known to carrya diversity of symbiotically-associated Proteobacteria.Results:A total of 34 phylotypes were placed in 11 different Actinobacteria families. Dichelopsmelacanthus held the highest diversity with six actinobacteria families represented by ninephylotypes. Thyanta perditor (n = 7), Edessa meditabunda (n = 5), Loxa deducta (n = 4) andPellea stictica (n = 3) were all associated with three families. Piezodorus guildini (n = 3) andNezara viridula (n = 3) had the lowest diversity, being associated with two(Propionibacteriaceae and Mybacteriaceae) and one (Streptomyceataceae) families,respectively. Corynebacteriaceae and Mycobacteriaceae were the most common familieswith phylotypes from three different insect species each one.Conclusions:Many phylotypes shared a low 16 S rRNA gene similarity with their closest type strains andformed new phyletic lines on the periphery of several genera. This is a strong indicative thatstinkbug caeca can harbor new species of actinobacteria, which might be derived fromspecific associations with the species of stinkbugs studied. Although the well-known role ofactinobacteria as a source of biomolecules, the ecological features of these symbionts on thestinkbugs biology remain unknown.

Identificador: doi:10.1186/1471-2180-12-101
Volume: 0
Página: 1 a


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