Title

Microorganisms facilitate uptake of dissolved organic nitrogen by seagrass leaves

Document Type

Journal Article

Publication Title

ISME J

ISSN

1751-7370

Volume

12

Issue

11

First Page

2796

Last Page

2800

PubMed ID

29977008

Publisher

Nature Publishing Group

Place of Publication

United Kingdom

School

Centre for Marine Ecosystems Research / School of Science

RAS ID

27287

Comments

Originally published as: Tarquinio, F., Bourgoure, J., Koenders, A., Laverock, B., Säwström, C., & Hyndes, G. A. (2018). Microorganisms facilitate uptake of dissolved organic nitrogen by seagrass leaves. The ISME journal, 12(11), 2796-2800. Original article available here.

Abstract

Microorganisms play a critical role in nitrogen cycling by mineralising dissolved organic nitrogen (DON) compounds into bioavailable inorganic forms (DIN). Although DIN is crucial for seagrass growth, the hypothesis that seagrass leaf associated-microorganisms could convert DON to forms available for plant uptake has never been tested. We conducted a laboratory-based experiment in which seagrass (Posidonia sinuosa) leaves were incubated with 15N-amino acids (aa), with and without associated microorganisms. Samples were collected after 0.5, 2, 6 and 12 h. Both bulk stable isotope and nanoscale secondary ion mass spectrometry (NanoSIMS) analysis showed high accumulation of 15N within seagrass leaf tissues with an associated microbiota, but not in plants devoid of microorganisms. These results significantly change our understanding of the mechanisms of seagrass nitrogen use and provide evidence that seagrass microbiota increase nitrogen availability for uptake by seagrass leaves by mineralising aa, thus enhancing growth and productivity of these important coastal ecosystems.

DOI

10.1038/s41396-018-0218-6

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