Abstract
Although several studies have examined intra-specific variability in growth and yield to projected atmospheric CO2 concentration, [CO2], few have considered concurrent increases in air temperature and [CO2], and none have compared the relative responses of cultivated and wild, weedy crop lines. In the current study we quantified the growth and seed yield response of three cultivated ('Rondo', 'Clearfield 161', 'M204') and one wild (red) rice line ('Stuttgart-S' or 'Stg-S'), grown at ambient or +200µmolmol-1 [CO2] at one of three day/night temperatures (29/21, 31/23 or 33/25°C). Averaged among all cultivars, [CO2] increased biomass and seed yield, but conversely, increasing air temperature reduced the [CO2] response of both parameters. Among the cultivated and weedy rice tested, 'Rondo' and 'Stg-S' showed significant increases in aboveground biomass and seed yield with elevated [CO2] at 29/21°C; however, only 'Stg-S', the weedy rice line, demonstrated a significant increase with [CO2] at all growth temperatures. A regression analysis for this line indicated that the relative increase in seed yield with [CO2] and air temperature was positively associated with panicle and tiller number, but negatively correlated with the percentage of immature seed. An analysis of all lines indicated that the ratio of tiller production between CO2 treatments at 30 days after sowing (DAS) was a significant predictor of seed yield response to increasing [CO2] for all temperatures. These results suggest that: (i) inclusion of wild lines may broaden genotypic or phenotypic variation and assist in selection to temperature/[CO2]; and (ii) early differences in tiller formation may be an effective means to facilitate screening for CO2 sensitive rice genotypes.
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Claims 10
Claim · model-written summary
Across cultivars, elevated CO2 increased biomass and seed yield.
- Taxon
- rice
Oryza sativat0 - Treatment
- [CO2]e0
- Outcome
- biomass and seed yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Averaged among all cultivars, [CO2] increased biomass and seed yield”
t0“rice lines”
Claim · model-written summary
Higher temperature reduced the CO2 response of biomass and seed yield.
- Taxon
- riceOryza sativat0
- Treatment
- increasing air temperaturee0
- Outcome
- [CO2] response of both parameterse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing air temperature reduced the [CO2] response of both parameters”
t0“rice lines”
Claim · model-written summary
Rondo biomass and seed yield increased significantly with elevated CO2 at 29/21°C.
- Taxon
- riceOryza sativat0
- Material
- 'Rondo'e0
- Treatment
- elevated [CO2]e0
- Outcome
- aboveground biomass and seed yielde0
- Direction
- increasese0
- Qualifier
- 29/21°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Rondo' and 'Stg-S' showed significant increases in aboveground biomass and seed yield with elevated [CO2] at 29/21°C”
t0“rice lines”
Claim · model-written summary
Stg-S biomass and seed yield increased significantly with elevated CO2 at 29/21°C.
- Taxon
- riceOryza sativat0
- Material
- 'Stg-S'e0
- Treatment
- elevated [CO2]e0
- Outcome
- aboveground biomass and seed yielde0
- Direction
- increasese0
- Qualifier
- 29/21°Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“'Rondo' and 'Stg-S' showed significant increases in aboveground biomass and seed yield with elevated [CO2] at 29/21°C”
t0“rice lines”
Claim · model-written summary
Only Stg-S increased significantly with elevated CO2 at all growth temperatures.
- Taxon
- riceOryza sativat0
- Material
- 'Stg-S'e0
- Treatment
- [CO2]e0
- Outcome
- significant increasee0
- Direction
- increasee0
- Qualifier
- all growth temperaturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only 'Stg-S', the weedy rice line, demonstrated a significant increase with [CO2] at all growth temperatures”
t0“rice lines”
Claim · model-written summary
In Stg-S, the relative seed yield increase was positively associated with panicle and tiller number.
- Taxon
- riceOryza sativat0
- Organ / stage
- panicle and tillere0
- Outcome
- relative increase in seed yielde0
- Direction
- positively associatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative increase in seed yield with [CO2] and air temperature was positively associated with panicle and tiller number”
t0“rice lines”
Claim · model-written summary
In Stg-S, the relative seed yield increase was negatively associated with immature seed percentage.
- Taxon
- riceOryza sativat0
- Organ / stage
- immature seede0
- Outcome
- relative increase in seed yielde1
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negatively correlated with the percentage of immature seed”
e1“the relative increase in seed yield with [CO2] and air temperature”
t0“rice lines”
Claim · model-written summary
The between-CO2-treatment ratio of tiller production at 30 DAS significantly predicted seed yield response at all temperatures.
- Taxon
- riceOryza sativat0
- Treatment
- CO2 treatmentse0
- Outcome
- seed yield response to increasing [CO2]e0
- Qualifier
- at 30 days after sowing (DAS)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of tiller production between CO2 treatments at 30 days after sowing (DAS) was a significant predictor of seed yield response to increasing [CO2] for all temperatures”
t0“rice lines”
Claim · model-written summary
The authors suggest including wild lines to broaden variation and aid selection for temperature and CO2 response.
- Taxon
- riceOryza sativat0
- Outcome
- inclusion of wild lines may broaden genotypic or phenotypic variation and assist in selection to temperature/[CO2]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inclusion of wild lines may broaden genotypic or phenotypic variation and assist in selection to temperature/[CO2]”
t0“rice lines”
Claim · model-written summary
The authors suggest early tiller differences may help screen CO2-sensitive rice genotypes.
- Taxon
- rice genotypesOryza sativae0
- Outcome
- early differences in tiller formation may be an effective means to facilitate screening for CO2 sensitive rice genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“early differences in tiller formation may be an effective means to facilitate screening for CO2 sensitive rice genotypes”
The same questions in other papers
co2 · yield · Oryza sativa (rice)Positive and negative results
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