Is there foul play in the leaf pocket? The metagenome of floating fern Azolla reveals endophytes that do not fix N2 but may denitrify

© 2017 The Authors. New Phytologist © 2017 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 217(2018), 1 vom: 30. Jan., Seite 453-466
1. Verfasser: Dijkhuizen, Laura W (VerfasserIn)
Weitere Verfasser: Brouwer, Paul, Bolhuis, Henk, Reichart, Gert-Jan, Koppers, Nils, Huettel, Bruno, Bolger, Anthony M, Li, Fay-Wei, Cheng, Shifeng, Liu, Xin, Wong, Gane Ka-Shu, Pryer, Kathleen, Weber, Andreas, Bräutigam, Andrea, Schluepmann, Henriette
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Azolla Nostoc 15N isotope N2-fixation Rhizobiales denitrification ditch water microbiome metagenome Nitrogen Isotopes mehr... Water 059QF0KO0R Nitrogen N762921K75 Oxygen S88TT14065
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100 1 |a Dijkhuizen, Laura W  |e verfasserin  |4 aut 
245 1 0 |a Is there foul play in the leaf pocket? The metagenome of floating fern Azolla reveals endophytes that do not fix N2 but may denitrify 
264 1 |c 2018 
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500 |a Date Completed 27.07.2018 
500 |a Date Revised 30.09.2020 
500 |a published: Print-Electronic 
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500 |a Citation Status MEDLINE 
520 |a © 2017 The Authors. New Phytologist © 2017 New Phytologist Trust. 
520 |a Dinitrogen fixation by Nostoc azollae residing in specialized leaf pockets supports prolific growth of the floating fern Azolla filiculoides. To evaluate contributions by further microorganisms, the A. filiculoides microbiome and nitrogen metabolism in bacteria persistently associated with Azolla ferns were characterized. A metagenomic approach was taken complemented by detection of N2 O released and nitrogen isotope determinations of fern biomass. Ribosomal RNA genes in sequenced DNA of natural ferns, their enriched leaf pockets and water filtrate from the surrounding ditch established that bacteria of A. filiculoides differed entirely from surrounding water and revealed species of the order Rhizobiales. Analyses of seven cultivated Azolla species confirmed persistent association with Rhizobiales. Two distinct nearly full-length Rhizobiales genomes were identified in leaf-pocket-enriched samples from ditch grown A. filiculoides. Their annotation revealed genes for denitrification but not N2 -fixation. 15 N2 incorporation was active in ferns with N. azollae but not in ferns without. N2 O was not detectably released from surface-sterilized ferns with the Rhizobiales. N2 -fixing N. azollae, we conclude, dominated the microbiome of Azolla ferns. The persistent but less abundant heterotrophic Rhizobiales bacteria possibly contributed to lowering O2 levels in leaf pockets but did not release detectable amounts of the strong greenhouse gas N2 O 
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700 1 |a Brouwer, Paul  |e verfasserin  |4 aut 
700 1 |a Bolhuis, Henk  |e verfasserin  |4 aut 
700 1 |a Reichart, Gert-Jan  |e verfasserin  |4 aut 
700 1 |a Koppers, Nils  |e verfasserin  |4 aut 
700 1 |a Huettel, Bruno  |e verfasserin  |4 aut 
700 1 |a Bolger, Anthony M  |e verfasserin  |4 aut 
700 1 |a Li, Fay-Wei  |e verfasserin  |4 aut 
700 1 |a Cheng, Shifeng  |e verfasserin  |4 aut 
700 1 |a Liu, Xin  |e verfasserin  |4 aut 
700 1 |a Wong, Gane Ka-Shu  |e verfasserin  |4 aut 
700 1 |a Pryer, Kathleen  |e verfasserin  |4 aut 
700 1 |a Weber, Andreas  |e verfasserin  |4 aut 
700 1 |a Bräutigam, Andrea  |e verfasserin  |4 aut 
700 1 |a Schluepmann, Henriette  |e verfasserin  |4 aut 
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