Abstract
The effect of free-air CO, enrichment (FACE) on the methanogenic archaeal communities inhabiting rice roots was studied in a Japanese rice field by separately collecting rice roots three times (at mid-tillering, panicle initiation, and heading stages) according to their nodal number, extracting DNA from the roots and subjecting it to polymerase-chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) and sequence analyses.Appearance of roots indicated that aging and senescence occurred faster under the FACE conditions than under the ambient conditions.The number of DGGE bands of methanogenic archaeal communities tended to increase with the growth stages.Cluster analysis showed that the succession of methanogenic archaeal communities in the ambient plot preceded that in the FACE plot, while the trend of the appearance of rice roots was opposite.All the closest relatives associated with the DGGE bands belonged to Methanomicrobiales and Rice cluster I, and FACE did not affect the phylogenetic position of the closest relatives associated with the characteristic DGGE bands.Faster succession of methanogenic archaeal communities in the ambient plot and similar phylogenetic members between the plots were observed in rice roots in years with both warmer (1999) and cooler (2003) weather during the rice cultivation period than in average years.
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Claims 6
Claim · model-written summary
Rice roots aged and senesced faster under FACE than ambient conditions.
- Taxon
- Rice
Oryza sativat0 - Treatment
- FACE conditionse0
- Outcome
- aging and senescencee0
- Direction
- fastere0
- Comparator
- ambient conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aging and senescence occurred faster under the FACE conditions than under the ambient conditions”
t0“Rice Roots”
Claim · model-written summary
Methanogenic archaeal DGGE band number tended to rise with rice growth stage.
- Taxon
- RiceOryza sativat0
- Organ / stage
- growth stagese0
- Interactor
- methanogenic archaeal communitiese0other
- Outcome
- number of DGGE bands of methanogenic archaeal communitiese0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of DGGE bands of methanogenic archaeal communities tended to increase with the growth stages”
t0“Rice Roots”
Claim · model-written summary
Methanogenic community succession occurred earlier in ambient than FACE rice plots.
- Taxon
- RiceOryza sativat0
- Treatment
- FACE plote0
- Interactor
- methanogenic archaeal communitiese0other
- Outcome
- succession of methanogenic archaeal communitiese0
- Direction
- precedede0
- Comparator
- ambient plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“succession of methanogenic archaeal communities in the ambient plot preceded that in the FACE plot”
t0“Rice Roots”
Claim · model-written summary
Closest relatives of rice-root DGGE bands belonged to Methanomicrobiales and Rice cluster I.
- Taxon
- RiceOryza sativat0
- Interactor
- Methanomicrobiales and Rice cluster Ie0other
- Outcome
- closest relatives associated with the DGGE bands belonged to Methanomicrobiales and Rice cluster Ie0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the closest relatives associated with the DGGE bands belonged to Methanomicrobiales and Rice cluster I”
t0“Rice Roots”
Claim · model-written summary
FACE did not alter phylogenetic placement of closest relatives of characteristic bands.
- Taxon
- RiceOryza sativat0
- Treatment
- FACEe0
- Outcome
- phylogenetic position of the closest relatives associated with the characteristic DGGE bandse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FACE did not affect the phylogenetic position of the closest relatives associated with the characteristic DGGE bands”
t0“Rice Roots”
Claim · model-written summary
Earlier ambient-plot succession and similar members occurred in both warmer and cooler years.
- Taxon
- RiceOryza sativat0
- Interactor
- methanogenic archaeal communitiese0other
- Outcome
- similar phylogenetic members between the plotse0
- Qualifier
- both warmer (1999) and cooler (2003) weathere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Faster succession of methanogenic archaeal communities in the ambient plot and similar phylogenetic members between the plots were observed in rice roots in years with both warmer (1999) and cooler (2003) weather”
t0“Rice Roots”
The same questions in other papers
co2 · quality: postharvest · Oryza sativa (rice)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.