Diversity, ecological distribution and biotechnological potential of Actinobacteria inhabiting seamounts and non-seamounts in the Tyrrhenian Sea

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• 作者：Besma Ettoumi^a ; ^b ; Habib Chouchane^c ; Amel Guesmi^a ; Mouna Mahjoubi^c ; Lorenzo Brusetti^d ; Mohamed Neifar^c ; Sara Borin^b ; Daniele Daffonchio^b ; ^e ; Ameur Cherif^a ; ^c ; ^{cherif.ameur@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Deep sea sediments ; Actinobacteria ; ARISA fingerprinting ; BOX-PCR ; Biosurfactant
• 刊名：Microbiological Research
• 出版年：2016
• 出版时间：May-June 2016
• 年：2016
• 卷：186-187
• 期：Complete
• 页码：71-80
• 全文大小：1008 K

文摘

In the present study, the ecological distribution of marine Actinobacteria isolated from seamount and non-seamount stations in the Tyrrhenian Sea was investigated. A collection of 110 isolates was analyzed by Automated Ribosomal Intergenic Spacer Analysis (ARISA) and 16S rRNA gene sequencing of representatives for each ARISA haplotype (n = 49). Phylogenetic analysis of 16S rRNA sequences showed a wide diversity of marine isolates and clustered the strains into 11 different genera, Janibacter, Rhodococcus, Arthrobacter, Kocuria, Dietzia, Curtobacterium, Micrococcus, Citricoccus, Brevibacterium, Brachybacterium and Nocardioides. Interestingly, Janibacter limosus was the most encountered species particularly in seamounts stations, suggesting that it represents an endemic species of this particular ecosystem. The application of BOX-PCR fingerprinting on J. limosus sub-collection (n = 22), allowed their separation into seven distinct BOX-genotypes suggesting a high intraspecific microdiversity among the collection. Furthermore, by screening the biotechnological potential of selected actinobacterial strains, J. limosus was shown to exhibit the most important biosurfactant activity. Our overall data indicates that Janibacter is a major and active component of seamounts in the Tyrrhenian Sea adapted to low nutrient ecological niche.