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NEWS AND VIEWS
03 November 2021

A seagrass harbours a nitrogen-fixing bacterial partner

How underwater seagrasses obtain the nitrogen they need has been unclear. Evidence has now emerged of a partnership with a bacterium that might be analogous to the system used by many land plants to gain nitrogen.

Douglas G. Capone

 ORCID: http://orcid.org/0000-0002-3968-736X

0

Douglas G. Capone

Douglas G. Capone is in the Department of Biological Sciences, University of Southern California, Los Angeles, California 90089, USA.

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Seagrass meadows are a prominent feature of many shallow coastal areas of the temperate through to the tropical ocean. Seagrasses provide a crucial habitat for invertebrates and juvenile fish, stabilize sediments and buffer the shoreline against erosion1. Moreover, they contribute directly and positively to the ‘blue economy’ of the oceans through their long-term storage of carbon2. Lush and highly productive seagrass beds often thrive in nutrient-deficient waters, and attempts to solve the enigma of how they accomplish this feat have driven considerable research over the years. Writing in Nature, Mohr et al.3 provide crucial evidence indicating that the success of a seagrass called Posidonia oceanica (Fig. 1), which proliferates throughout the warm waters of the Mediterranean Sea (and elsewhere), might be attributed to the development of a highly integrated partnership with a bacterium. This system is reminiscent of those found in some terrestrial plants.

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doi: https://doi.org/10.1038/d41586-021-02956-y

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Etymology‘Candidatus Celerinatantimonas neptuna’ (nep.tu’na L. fem. n.), pertaining to Neptunus (L. masc. n. Neptune), the Roman god of the seas and the Neptune grass, Posidonia oceanica.SamplingA P. oceanica meadow at 8 m water depth and nearby sandy sediments in Fetovaia Bay, Elba, Italy13 were sampled between June 2014 and September 2019; individual sampling months and years are indicated in the sections below and/or in the figures and tables. In May 2017, a P. oceanica meadow at the island of Pianosa, Italy was also sampled. All of the samples were obtained via SCUBA diving.Complete plants of P. oceanica were carefully separated from the meadow by hand and stored in seawater-filled containers until arrival at the shore-based laboratory. Sediment for use in the laboratory-based aquaria was scooped into containers from nearby sandy patches. Seawater was pumped through a hose (placed at about 0.5 m above the P. oceanica meadow) into several 50 l barrels onboard the boat and was later used in the laboratory for the aquarium and the incubation experiments.The sediment within the seagrass meadow was sampled with stainless steel core tubes (length, 50 cm), which were drilled into the sediment by divers, and the cores were briefly stored at 22 °C (ambient temperature, September 2019) in a seawater-filled barrel until further processing at the shore-based laboratory.Porewater nutrient samples were obtained using stainless steel lances41 at intervals of around 10 cm. Water column nutrient samples were obtained from above the seagrass meadow at the start or end of sampling. Nutrient samples were collected in 15 ml or 50 ml centrifuge tubes and were stored in a cooler box until further processing.Nutrient measurementsWater column nutrients were measured during several sampling campaigns as indicated in Extended Data Table 1a. Ammonium (NH4+) concentrations were measured fluorometrically42 in the nearby shore-based laboratory, and the remaining water was frozen (−20 °C) for later analyses of nitrate (NO3−), nitrite (NO2−), phosphate (PO43−) and silicate (SiO44−) using an autoanalyser (QuAAtro, Seal Analytical). Porewater samples were obtained in June 2019 and were processed the same as the water column nutrient samples with the exception that ammonium was not measured on site but at the home laboratory at the same time as the other nutrients. Dissolved inorganic nitrogen (ammonium plus NOx−) concentrations in the porewater were averaged for the upper 20 cm (Extended Data Table 1b).Net primary production measurements using the EC methodNet carbon dioxide (CO2) fluxes were calculated on the basis of oxygen (O2) fluxes determined using the aquatic eddy covariance (EC) method. In this non-invasive approach, turbulence-induced transport is resolved using high-frequency current meters combined with fast O2 microsensors. Under the assumption of stationarity, the instantaneous turbulent flux contributions are calculated by correlating vertical current fluctuations to oxygen fluctuations. Our EC system was equipped with an acoustic Doppler velocimeter (ADV, Nortek) and ultra-fast responding optode microsensors with a tip diameter of 430 µm (t90  More