Abstract
Under paddy field conditions, biological sulfur oxidation occurs in the oxidized surface soil layer and rhizosphere, in which oxygen leaks from the aerenchyma system of rice plants. In the present study, we examined community shifts in sulfur-oxidizing bacteria associated with the oxidized surface soil layer and rice roots under different sulfur fertilization conditions based on the 16S ribosomal RNA (rRNA) gene in order to explore the existence of oligotrophic sulfur-oxidizing bacteria in the paddy rice ecosystem. Rice plants were grown in pots with no fertilization (control) or CaCO3 or CaSO4 fertilization. A principal-coordinates analysis (PCoA) showed that CaSO4 fertilization markedly affected bacterial communities associated with rice roots and soil, whereas no significant differences were observed in plant growth among the fertilizer treatments examined. In rice roots, the relative abundance of Acidobacteria, Alphaproteobacteria, Gammaproteobacteria, and TM7 was significantly higher in CaSO4-fertilized pots than in control pots. Alphaproteobacteria, Bradyrhizobiaceae, and Methylocystaceae members were significantly more abundant in CaSO4-fertilized roots than in control roots. On the other hand, the abundance of Actinobacteria and Proteobacteria was lower in CaSO4-fertilized soil than in control soil. These results indicate that the bacteria associated with rice roots and soil responded to the sulfur amendment, suggesting that more diverse bacteria are involved in sulfur oxidation in the rice paddy ecosystem than previously considered.
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Claims 6
Claim · model-written summary
CaSO4 fertilization markedly shifted rice-root and soil bacterial communities.
- Taxon
- Rice
Oryza sativat0 - Treatment
- CaSO4 fertilizatione0
- Outcome
- bacterial communities associated with rice roots and soile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CaSO4 fertilization markedly affected bacterial communities associated with rice roots and soil”
t0“Rice”
Claim · model-written summary
Plant growth did not significantly differ among fertilizer treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- fertilizer treatmentse0
- Outcome
- plant growthe0
- Direction
- no significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences were observed in plant growth among the fertilizer treatments examined.”
t0“Rice”
Claim · model-written summary
Acidobacteria, Alphaproteobacteria and Gammaproteobacteria were more abundant in CaSO4-fertilized roots than controls.
- Taxon
- RiceOryza sativat0
- Organ / stage
- rootse0
- Treatment
- CaSO4-fertilized potse0
- Outcome
- relative abundance of Acidobacteria, Alphaproteobacteria, Gammaproteobacteriae0
- Direction
- highere0
- Comparator
- control potse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In rice roots, the relative abundance of Acidobacteria, Alphaproteobacteria, Gammaproteobacteria, and TM7 was significantly higher in CaSO4-fertilized pots than in control pots.”
t0“Rice”
Claim · model-written summary
TM7 abundance was higher in CaSO4-fertilized roots than controls.
- Taxon
- RiceOryza sativat0
- Treatment
- CaSO4-fertilized potse0
- Outcome
- TM7e0
- Direction
- highere0
- Comparator
- control potse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative abundance of Acidobacteria, Alphaproteobacteria, Gammaproteobacteria, and TM7 was significantly higher in CaSO4-fertilized pots than in control pots.”
t0“Rice”
Claim · model-written summary
Bradyrhizobiaceae and Methylocystaceae were more abundant in fertilized roots.
- Taxon
- RiceOryza sativat0
- Treatment
- CaSO4-fertilized rootse0
- Outcome
- Bradyrhizobiaceae, and Methylocystaceae memberse0
- Direction
- more abundante0
- Comparator
- control rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bradyrhizobiaceae, and Methylocystaceae members were significantly more abundant in CaSO4-fertilized roots than in control roots.”
t0“Rice”
Claim · model-written summary
Actinobacteria and Proteobacteria were less abundant in fertilized soil.
- Taxon
- RiceOryza sativat0
- Treatment
- CaSO4-fertilized soile0
- Outcome
- abundance of Actinobacteria and Proteobacteriae0
- Direction
- lowere0
- Comparator
- control soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the abundance of Actinobacteria and Proteobacteria was lower in CaSO4-fertilized soil than in control soil.”
t0“Rice”
The same questions in other papers
fertilization · growth · Oryza sativa (rice)Positive and negative results
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