Abstract
SUMMARY Rice plants ( Oryza saliva L., cv. IR30) were grown in paddy culture in outdoor, naturally sunlit, controlled-environment, plant growth chambers at Gainesville, Florida, USA, in 1987. The rice plants were exposed throughout the season to subambient (160 and 250), ambient (330) or superambient (500, 660, 900 μmol CO 2 /mol air) CO 2 concentrations. Total shoot biomass, root biomass, tillering, and final grain yield increased with increasing CO 2 concentration, thegreatest increase occurring between the 160 and 500 μmol CO 2 /mol air treatments. Early in the growing season, root:shoot biomass ratio increased with increasing CO 2 concentration; although the ratio decreased during the growing season, net assimilation rate increased with increasingCO 2 concentration and decreased during the growing season. Differences in biomass and lamina area among CO 2 treatments were largely due to corresponding differences in tillering response. The number of panicles/plant was almost entirely responsible for differences in final grain yield among CO 2 treatments. Doubling the CO2 concentration from 330 to 660 μmol CO 2 /mol air resulted in a 32 % increase in grain yield. These results suggest that important changes in the growth and yield of rice may be expected in the future as the CO 2 concentration of the earth's atmosphere continues to rise.
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Claims 9
Claim · model-written summary
Total shoot biomass, root biomass and tillering of rice increased with increasing CO2 concentration, most between the 160 and 500 μmol CO2/mol air treatments.
- Taxon
- rice
Oryza sativat0 - Treatment
- CO 2 concentratione0
- Outcome
- Total shoot biomass, root biomass, tilleringe0
- Direction
- increasede0
- Qualifier
- greatest increase occurring between the 160 and 500 μmol CO 2 /mol air treatmentse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Total shoot biomass, root biomass, tillering, and final grain yield increased with increasing CO 2 concentration”
e1“thegreatest increase occurring between the 160 and 500 μmol CO 2 /mol air treatments”
Claim · model-written summary
Final grain yield of rice increased with increasing CO2 concentration.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 concentratione0
- Outcome
- final grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Total shoot biomass, root biomass, tillering, and final grain yield increased with increasing CO 2 concentration”
Claim · model-written summary
Early in the growing season the root:shoot biomass ratio of rice increased with increasing CO2 concentration.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 concentratione0
- Outcome
- root:shoot biomass ratioe0
- Direction
- increasede0
- Qualifier
- Early in the growing seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Early in the growing season, root:shoot biomass ratio increased with increasing CO 2 concentration”
Claim · model-written summary
The root:shoot biomass ratio of rice decreased during the growing season.
- Taxon
- riceOryza sativat0
- Outcome
- ratioe0
- Direction
- decreasede0
- Qualifier
- during the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“although the ratio decreased during the growing season”
Claim · model-written summary
Net assimilation rate of rice increased with increasing CO2 concentration.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 concentratione0
- Outcome
- net assimilation ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“net assimilation rate increased with increasingCO 2 concentration and decreased during the growing season”
Claim · model-written summary
Net assimilation rate of rice decreased during the growing season.
- Taxon
- riceOryza sativat0
- Outcome
- net assimilation ratee0
- Direction
- decreasede0
- Qualifier
- during the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“net assimilation rate increased with increasingCO 2 concentration and decreased during the growing season”
Claim · model-written summary
Differences in biomass and lamina area among CO2 treatments were largely due to corresponding differences in tillering response.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 treatmentse0
- Outcome
- Differences in biomass and lamina areae0
- Qualifier
- corresponding differences in tillering responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Differences in biomass and lamina area among CO 2 treatments were largely due to corresponding differences in tillering response”
Claim · model-written summary
The number of panicles per plant was almost entirely responsible for differences in final grain yield among CO2 treatments.
- Taxon
- riceOryza sativat0
- Treatment
- CO 2 treatmentse0
- Outcome
- differences in final grain yielde0
- Qualifier
- number of panicles/plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The number of panicles/plant was almost entirely responsible for differences in final grain yield among CO 2 treatments”
Claim · model-written summary
Doubling the CO2 concentration from 330 to 660 μmol CO2/mol air increased rice grain yield by 32%.
- Taxon
- riceOryza sativat0
- Treatment
- Doubling the CO2 concentration from 330 to 660 μmol CO 2 /mol aire0
- Outcome
- grain yielde0
- Direction
- increasee0
- Value
- 32 %e0
- Comparator
- 330e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Doubling the CO2 concentration from 330 to 660 μmol CO 2 /mol air resulted in a 32 % increase in grain yield”
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
- positive
- positive
120 papers more in this group
See all 124 papers →co2 · yield · Oryza sativa (rice)Positive and negative results
130 papers in the same direction as this paper · 28 in the opposite direction
- negative
- positive
- positive
155 papers more in this group
See all 159 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.