Abstract
The influence of nitrate addition and the presence of Glyceria maxima (reed sweetgrass) on the composition and nitrate metabolism of the dissimilatory nitrate-reducing bacterial community was investigated. Anoxic freshwater sediment was incubated in pots with or without G. maxima and with or without addition of nitrate. After incubation the sediments were sampled. Dilution series of these sediment samples were incubated in deep agar tubes and almost all colonies from the most diluted tubes were isolated and purified. When the nitrate concentration was low, 80% of the nitrate-reducing community in the rhizosphere of G. maxima consisted of NO2−-accumulating or NH4+-producing Bacillus strains. In bulk sediment with low nitrate concentrations, denitrifying Pseudomonas and Acinetobacter strains were dominant. The difference in the composition of the nitrate-reducing community between sediment with or without plants disappeared when nitrate was added. Denitrifying pseudomonads then made up 78–86% of the nitrate-reducing community. This shows that when the nitrate concentration was low, the presence of G. maxima greatly influenced the nitrate-reducing community. However, when nitrate was present and available, the composition and nitrate metabolism of the dominant nitrate-reducing community was probably not affected by G. maxima.
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Claims 6
Claim · model-written summary
At low nitrate, 80% of the rhizosphere nitrate-reducing community comprised Bacillus strains.
- Taxon
- Glyceria maxima
Glyceria maximat0 - Interactor
- Bacillus strainse0other
- Outcome
- nitrate-reducing community in the rhizosphere of G. maximae0
- Value
- 80%e0
- Qualifier
- When the nitrate concentration was lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the nitrate concentration was low, 80% of the nitrate-reducing community in the rhizosphere of G. maxima consisted of NO2−-accumulating or NH4+-producing Bacillus strains.”
t0“Glyceria maxima”
Claim · model-written summary
Denitrifying Pseudomonas and Acinetobacter dominated low-nitrate bulk sediment.
- Taxon
- Glyceria maximaGlyceria maximat0
- Outcome
- denitrifying Pseudomonas and Acinetobacter strains were dominante0
- Qualifier
- bulk sediment with low nitrate concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In bulk sediment with low nitrate concentrations, denitrifying Pseudomonas and Acinetobacter strains were dominant.”
t0“Glyceria maxima”
Claim · model-written summary
Added nitrate eliminated the plant-associated difference in nitrate-reducer community composition.
- Taxon
- Glyceria maximaGlyceria maximat0
- Treatment
- nitrate was addede0
- Outcome
- difference in the composition of the nitrate-reducing communitye0
- Direction
- disappearede0
- Comparator
- sediment with or without plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference in the composition of the nitrate-reducing community between sediment with or without plants disappeared when nitrate was added.”
t0“Glyceria maxima”
Claim · model-written summary
Under added nitrate, denitrifying pseudomonads accounted for 78–86% of the nitrate-reducing community.
- Taxon
- Glyceria maximaGlyceria maximat0
- Interactor
- pseudomonadse0other
- Outcome
- nitrate-reducing communitye0
- Value
- 78–86%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Denitrifying pseudomonads then made up 78–86% of the nitrate-reducing community.”
t0“Glyceria maxima”
Claim · model-written summary
At low nitrate, G. maxima strongly influenced the nitrate-reducing community.
- Taxon
- Glyceria maximaGlyceria maximat0
- Treatment
- presence of G. maximae0
- Outcome
- nitrate-reducing communitye0
- Qualifier
- when the nitrate concentration was lowe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the nitrate concentration was low, the presence of G. maxima greatly influenced the nitrate-reducing community.”
t0“Glyceria maxima”
Claim · model-written summary
With nitrate available, G. maxima probably did not affect dominant community composition and nitrate metabolism.
- Taxon
- Glyceria maximaGlyceria maximat0
- Treatment
- G. maximae0
- Outcome
- composition and nitrate metabolism of the dominant nitrate-reducing communitye0
- Direction
- not affectede0
- Qualifier
- when nitrate was present and availablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when nitrate was present and available, the composition and nitrate metabolism of the dominant nitrate-reducing community was probably not affected by G. maxima.”
t0“Glyceria maxima”