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Titolo:
Sulphate reduction and nitrogen fixation rates associated with roots, rhizomes and sediments from Zostera noltii and Spartina maritima meadows
Autore:
Nielsen, LB; Finster, K; Welsh, DT; Donelly, A; Herbert, RA; de Wit, R; Lomstein, BA;
Indirizzi:
Univ Aarhus, Inst Biol Sci, Dept Microbial Ecol, DK-8000 Aarhus, Denmark Univ Aarhus Aarhus Denmark DK-8000 crobial Ecol, DK-8000 Aarhus, Denmark Univ Parma, Dipartimento Sci Ambientali, I-431000 Parma, Italy Univ ParmaParma Italy I-431000 to Sci Ambientali, I-431000 Parma, Italy Univ Dundee, Dept Biol Sci, Dundee DD1 4HN, Scotland Univ Dundee Dundee Scotland DD1 4HN t Biol Sci, Dundee DD1 4HN, Scotland Univ Bordeaux 1, Ctr Oceanog & Biol Marine, Lab Oceanog Biol, CNRS,UMR 5805, F-33120 Arcachon, France Univ Bordeaux 1 Arcachon France F-33120 R 5805, F-33120 Arcachon, France
Titolo Testata:
ENVIRONMENTAL MICROBIOLOGY
fascicolo: 1, volume: 3, anno: 2001,
pagine: 63 - 71
SICI:
1462-2912(200101)3:1<63:SRANFR>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SULFATE-REDUCING BACTERIA; DISSOLVED ORGANIC-CARBON; PLANT PHOTOSYNTHESIS; HALODULE-WRIGHTII; SEAGRASS MEADOWS; ALTERNIFLORA; PRODUCTIVITY; MARINA; RHIZOSPHERE; CARPENTARIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Lomstein, BA Univ Aarhus, Inst Biol Sci, Dept Microbial Ecol, Bldg 540,Ny Munkegade, DK-8000 Aarhus, Denmark Univ Aarhus Bldg 540,Ny Munkegade Aarhus Denmark DK-8000 ark
Citazione:
L.B. Nielsen et al., "Sulphate reduction and nitrogen fixation rates associated with roots, rhizomes and sediments from Zostera noltii and Spartina maritima meadows", ENVIRON MIC, 3(1), 2001, pp. 63-71

Abstract

Sulphate reduction rates (SRR) and nitrogen fixation rates (NFR) associated with isolated roots, rhizomes and sediment from the rhizosphere of the marine macrophytes Zostera noltii and Spartina maritima, and the presence anddistribution of Bacteria on the roots and rhizomes, were investigated. Between 1 parts per thousand and 3 parts per thousand of the surface area of the roots and rhizomes of both macrophytes were colonized by Bacteria. Bacteria on the surfaces of S. maritima roots and rhizomes were evenly distributed, while the distribution of Bacteria on Z. noltii roots and rhizomes was patchy. Root- and rhizome-associated SRR and NFR were always higher than rates in the bulk sediment. in particular, nitrogen fixation associated with the roots and rhizomes was 41-65D-fold higher than in the bulk sediment. Despite the fact that sulphate reduction was elevated on roots and rhizomes compared with bulk sediment, the contribution of plant-associated sulphate reduction to overall sulphate reduction was small (less than or equal to 11%). In contrast, nitrogen fixation associated with the roots and rhizomes accounted for 31% and 91% of the nitrogen fixed in the rhizosphere of Z. noltii and S. maritima respectively. In addition, plant-associated nitrogen fixation could supply 37-1613% of the nitrogen needed by the sulphate-reducingcommunity. Sucrose stimulated nitrogen fixation and sulphate reduction significantly in the root and rhizome compartments of both macrophytes, but not in the bulk sediment.

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Documento generato il 04/07/20 alle ore 21:21:20