NDLI: NifHgene diversity and expression in a microbial mat community on the McMurdo Ice Shelf, Antarctica

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NifHgene diversity and expression in a microbial mat community on the McMurdo Ice Shelf, Antarctica

Content Provider	Scilit
Author	Jungblut, Anne D. Neilan, Brett A.
Copyright Year	2009
Description	$N_{2}$-fixation is an important mechanism in microbial mats of the McMurdo Ice Shelf as nitrogen sources are limited. Here we applied molecular analyses of the $N_{2}$-fixing diversity in cyanobacterial dominated microbial mats in a meltwater pond, known as Orange Pond, on the McMurdo Ice Shelf. Phylogenetic analyses ofnifHgenes andnifHgene transcripts were performed in association with acetylene reduction assay measurements. Eighteen phylotypes with the highest similarities to cyanobacteria, firmicutes, beta-, gamma- and deltaproteobacteria, spirochaetes and verrumicrobia were identified. All cyanobacterialnifHphylotypes grouped solely in the genusNostocspp. Clone-library analysis ofnifHgene transcripts only identified sequences with a highest match toNostocspp. and acetylene reduction activity was identified in the presence of light and absence of 3-(3,4-dichlorophenyl)-1,1-dimethyl urea. These molecular results indicate that a variety of bacterial phyla possess the ability to fix nitrogen. However, under the tested conditions the only organisms actively transcribingnifHgenes wereNostocspp. This underlines the importance ofNostocfor the nitrogen budget on the McMurdo Ice Shelf.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/501414B85B4B49F3D329A51F61BAB06B/S0954102009990514a.pdf/div-class-title-span-class-italic-nifh-span-gene-diversity-and-expression-in-a-microbial-mat-community-on-the-mcmurdo-ice-shelf-antarctica-div.pdf
Ending Page	122
Page Count	6
Starting Page	117
ISSN	09541020
e-ISSN	13652079
DOI	10.1017/s0954102009990514
Journal	Antarctic Science
Issue Number	2
Volume Number	22
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	2010-04-01
Access Restriction	Open
Subject Keyword	Antarctic Science Dinitrogen Reductase
Content Type	Text
Resource Type	Article
Subject	Geology Ecology, Evolution, Behavior and Systematics Oceanography

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