Abstract
The influence of rising atmospheric CO2 concentrations and phosphorus nutrition on growth, grain yield and quality of a early maturing rice cultivar (Oryza sativa L. cv. Jarrah) was investigated by growing plants in a range of phosphorus levels at either 350 or 700 μL CO2 L−1 in the growth chambers. Total above ground biomass and grain yield were greater at elevated CO2 concentrations and with increasing phosphorus supply. The CO2 response was evident at all but the lowest phosphorus treatments but its magnitude was greater at moderate phosphorus supplies. The increase in grain yield at high CO2 was due mainly to an enhancement of tiller number. The phosphorus concentration in the foliage was unaffected by CO2 enrichment and the critical concentration of 1.8 g kg−1 dwt was the same as reported for field-grown rice. The concentration of calcium in the foliage was increased by high CO2 and the nitrogen concentration was reduced. Chemical analysis (amylose and mineral concentration) indicated that cooked rice grain from high-CO2-grown plants would be firmer and that concentrations of Zn and Fe, which are important in the diet of humans, will be lower. These results indicate that there is a need to plan for the inevitable rise in global CO2 concentrations by selecting cultivars which will be more productive and yet maintain suitable quality characteristics under elevated CO2 levels.
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Claims 13
Claim · model-written summary
Aboveground biomass was greater under elevated CO2.
Not reportedTaxonComparator
Verbatim
e0“Total above ground biomass and grain yield were greater at elevated CO2 concentrations and with increasing phosphorus supply.”
Claim · model-written summary
Grain yield was greater under elevated CO2.
Not reportedTaxonComparator
Verbatim
e0“Total above ground biomass and grain yield were greater at elevated CO2 concentrations and with increasing phosphorus supply.”
Claim · model-written summary
Aboveground biomass increased with phosphorus supply.
Not reportedTaxon
Verbatim
e0“Total above ground biomass and grain yield were greater at elevated CO2 concentrations and with increasing phosphorus supply.”
Claim · model-written summary
Grain yield increased with phosphorus supply.
Not reportedTaxon
Verbatim
e0“Total above ground biomass and grain yield were greater at elevated CO2 concentrations and with increasing phosphorus supply.”
Claim · model-written summary
The CO2 response was absent at the lowest phosphorus treatments and greater at moderate supply.
Not reportedTaxon
Verbatim
e0“The CO2 response was evident at all but the lowest phosphorus treatments but its magnitude was greater at moderate phosphorus supplies.”
Claim · model-written summary
High CO2 increased tiller number, accounting for much of the grain yield increase.
- Treatment
- high CO2e0
- Outcome
- increase in grain yielde0
- Direction
- increasee0
- Qualifier
- enhancement of tiller numbere0
Not reportedTaxon
Verbatim
e0“The increase in grain yield at high CO2 was due mainly to an enhancement of tiller number.”
Claim · model-written summary
CO2 enrichment did not change foliage phosphorus concentration.
- Taxon
- rice
Oryza sativae0 - Treatment
- CO2 enrichmente0
- Outcome
- phosphorus concentration in the foliagee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phosphorus concentration in the foliage was unaffected by CO2 enrichment and the critical concentration of 1.8 g kg−1 dwt was the same as reported for field-grown rice.”
Claim · model-written summary
The critical foliage phosphorus concentration matched the reported field-grown rice value.
- Taxon
- riceOryza sativae0
- Outcome
- critical concentratione0
- Direction
- samee0
- Value
- 1.8 g kg−1 dwte0
- Comparator
- field-grown ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the critical concentration of 1.8 g kg−1 dwt was the same as reported for field-grown rice.”
Claim · model-written summary
High CO2 increased foliage calcium concentration.
Not reportedTaxonComparator
Verbatim
e0“The concentration of calcium in the foliage was increased by high CO2 and the nitrogen concentration was reduced.”
Claim · model-written summary
High CO2 reduced foliage nitrogen concentration.
Not reportedTaxonComparator
Verbatim
e0“The concentration of calcium in the foliage was increased by high CO2 and the nitrogen concentration was reduced.”
Claim · model-written summary
Cooked grain from high CO2 plants was predicted to be firmer.
- Taxon
- riceOryza sativae0
- Treatment
- high-CO2-grown plantse0
- Outcome
- cooked rice graine0
- Direction
- firmere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chemical analysis (amylose and mineral concentration) indicated that cooked rice grain from high-CO2-grown plants would be firmer”
Claim · model-written summary
Grain zinc and iron concentrations were predicted to be lower under high CO2.
Not reportedTaxon
Verbatim
e0“concentrations of Zn and Fe, which are important in the diet of humans, will be lower.”
Claim · model-written summary
The authors recommend selecting cultivars productive under elevated CO2 that maintain quality.
- Outcome
- selecting cultivarse0
- Qualifier
- more productive and yet maintain suitable quality characteristics under elevated CO2 levelse0
Not reportedTaxon
Verbatim
e0“selecting cultivars which will be more productive and yet maintain suitable quality characteristics under elevated CO2 levels.”
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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.