Abstract
The influence of elevated CO2 on the development of the shoot apex and on subsequent vegetative growth and grain yield was investigated using rice (Oryza sativa L. cv Jarrah) grown in flooded soil at either 350 or 700 [mu]L CO2 L-1. At 8 d after planting (DAP), elevated CO2 increased the height and diameter of the apical dome and lengths of leaf primordia and tiller buds but had no effect on their numbers. By 16 DAP, there were five tiller buds in the apex at 700 [mu]L CO2 L-1 compared with only three tiller buds at 350 [mu]L CO2 L-1. These changes in development of the shoot apex at high CO2 were forerunners to faster development of the vegetative shoot at elevated CO2 between 11 and 26 DAP as evidenced by increases in the relative growth rates of the shoot and tillers. Accelerated development at high CO2 was responsible for the 42% increase in tiller number at the maximum tillering stage and the 57% enhancement of grain yield at the final harvest. The link between high CO2 effects on development during the first 15 DAP and final tiller number and grain yield was demonstrated by delaying exposure of plants to high CO2 for 15 d. The delay totally inhibited the tillering response to high CO2, and the increase in grain yield of 20% arose from a greater number of grains per panicle. Consequently, it can be concluded that accelerated development in the shoot apex early in development is crucial for obtaining maximum increases in grain yield at elevated atmospheric CO2 concentrations.
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Claims 9
Claim · model-written summary
height and diameter of the apical dome and lengths of leaf primordia and tiller buds increased under elevated CO2.
- Taxon
- Rice
Oryza sativat0 - Treatment
- elevated CO2e0
- Outcome
- height and diameter of the apical dome and lengths of leaf primordia and tiller budse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO2 increased the height and diameter of the apical dome and lengths of leaf primordia and tiller buds but had no effect on their numbers”
t0“Rice”
Claim · model-written summary
numbers no effect under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- numberse0
- Direction
- no effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had no effect on their numbers”
t0“Rice”
Claim · model-written summary
tiller buds five under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- tiller budse0
- Direction
- fivee0
- Value
- five tiller budse0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were five tiller buds in the apex at 700 [mu]L CO2 L-1 compared with only three tiller buds at 350 [mu]L CO2 L-1”
t0“Rice”
Claim · model-written summary
relative growth rates of the shoot and tillers increases under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- relative growth rates of the shoot and tillerse0
- Direction
- increasese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in the relative growth rates of the shoot and tillers”
t0“Rice”
Claim · model-written summary
tiller number increase under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- tiller numbere0
- Direction
- increasee0
- Value
- 42%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“42% increase in tiller number”
t0“Rice”
Claim · model-written summary
grain yield enhancement under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- grain yielde0
- Direction
- enhancemente0
- Value
- 57%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“57% enhancement of grain yield”
t0“Rice”
Claim · model-written summary
tillering response inhibited under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- tillering responsee0
- Direction
- inhibitede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The delay totally inhibited the tillering response to high CO2”
t0“Rice”
Claim · model-written summary
grain yield increase under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- grain yielde0
- Direction
- increasee0
- Value
- 20%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in grain yield of 20%”
t0“Rice”
Claim · model-written summary
Greater grain number per panicle explained the 20% yield increase after delayed CO2 exposure.
- Taxon
- RiceOryza sativat0
- Organ / stage
- grains per paniclee0
- Outcome
- increase in grain yielde0
- Value
- 20%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in grain yield of 20% arose from a greater number of grains per panicle”
t0“Rice”
The same questions in other 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
- no effect
- negative
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.