Abstract
The effects of CO2 enrichment on growth and N allocation of rice (Oryza sativa L.) were examined. The plants were grown hydroponically in growth chambers with a 14-h photoperiod (1000 [mu]mol quanta m-2 s-1) and a day/night temperature of 25/20[deg]C. From the 28th to 70th d after germination, the plants were exposed to two CO2 partial pressures, namely 36 and 100 Pa. The CO2 enrichment increased the final biomass, but this was caused by a stimulation of the growth rate during the first week of the exposure to elevated CO2 partial pressures. The disappearance of the initial stimulation of the growth rate was associated with a decreased leaf area ratio. Furthermore, CO2 enrichment decreased the investment of N in the leaf blades, whereas the N allocation into the leaf sheaths and roots increased. Thus, the decrease in leaf N content by CO2 enrichment was not due to dilution of N caused by a relative increase in the plant biomass but was due to the change in N allocation at the whole-plant level. We conclude that the growth responses of rice to CO2 enrichment are mainly controlled by leaf area expansion and N allocation into leaf blades at the whole-plant level.
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Claims 7
Claim · model-written summary
CO2 enrichment increased final rice biomass.
- Taxon
- rice
Oryza sativat0 - Treatment
- CO2 enrichmente0
- Outcome
- final biomasse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CO2 enrichment increased the final biomass”
t0“Rice”
Claim · model-written summary
CO2 enrichment stimulated growth rate during its first week.
- Taxon
- riceOryza sativat0
- Treatment
- elevated CO2 partial pressurese0
- Outcome
- growth ratee0
- Direction
- stimulatione0
- Qualifier
- first weeke0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a stimulation of the growth rate during the first week of the exposure to elevated CO2 partial pressures”
t0“Rice”
Claim · model-written summary
Loss of the initial growth stimulation was associated with decreased leaf area ratio.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaf area ratioe0
- Outcome
- growth ratee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The disappearance of the initial stimulation of the growth rate was associated with a decreased leaf area ratio”
t0“Rice”
Claim · model-written summary
CO2 enrichment decreased nitrogen investment in leaf blades.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaf bladese0
- Treatment
- CO2 enrichmente0
- Outcome
- investment of Ne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 enrichment decreased the investment of N in the leaf blades”
t0“Rice”
Claim · model-written summary
CO2 enrichment increased nitrogen allocation into leaf sheaths and roots.
- Taxon
- riceOryza sativat0
- Organ / stage
- leaf sheaths and rootse0
- Treatment
- CO2 enrichmente0
- Outcome
- N allocatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO2 enrichment decreased the investment of N in the leaf blades, whereas the N allocation into the leaf sheaths and roots increased”
t0“Rice”
Claim · model-written summary
The reduced leaf nitrogen content was attributed to whole-plant nitrogen reallocation.
- Taxon
- riceOryza sativat0
- Treatment
- CO2 enrichmente0
- Outcome
- decrease in leaf N contente0
- Qualifier
- change in N allocation at the whole-plant levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in leaf N content by CO2 enrichment was not due to dilution of N caused by a relative increase in the plant biomass but was due to the change in N allocation at the whole-plant level”
t0“Rice”
Claim · model-written summary
Leaf area expansion and leaf blade nitrogen allocation mainly controlled rice growth responses to CO2.
- Taxon
- riceOryza sativae0
- Treatment
- CO2 enrichmente0
- Outcome
- growth responsese0
- Qualifier
- leaf area expansion and N allocation into leaf blades at the whole-plant levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the growth responses of rice to CO2 enrichment are mainly controlled by leaf area expansion and N allocation into leaf blades at the whole-plant level”
The same questions in other papers
co2 · growth · Oryza sativa (rice)Positive and negative results
99 papers in the same direction as this paper · 23 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
120 papers more in this group
See all 124 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.