Abstract
Balancing of leaf carbohydrates is a key process for maximising crop performance in elevated CO2 environments. With the aim of testing the role of the carbon sink-source relationship under different CO2 conditions, we performed two experiments with two barley genotypes (Harrington and RCSL-89) exposed to changing CO2. In Experiment 1, the genotypes were exposed to 400 and 700 ppm CO2. Elevated CO2 induced photosynthetic acclimation in Harrington that was linked with the depletion of Rubisco protein. In contrast, a higher peduncle carbohydrate-storage capacity in RSCL-89 was associated with a better balance of leaf carbohydrates that could help to maximize the photosynthetic capacity under elevated CO2. In Experiment 2, plants that were grown at 400 ppm or 700 ppm CO2 for 5 weeks were switched to 700 ppm or 400 ppm CO2, respectively. Raising CO2 to 700 ppm increased photosynthetic rates with a reduction in leaf carbohydrate content and an improvement in N assimilation. The increase in nitrate content was associated with up-regulation of genes of protein transcripts of photosynthesis and N assimilation that favoured plant performance under elevated CO2. Finally, decreasing the CO2 from 700 ppm to 400 ppm revealed that both stomatal closure and inhibited expression of light-harvesting proteins negatively affected photosynthetic performance and plant growth.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Elevated CO2 induced photosynthetic acclimation in Harrington.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Material
- Harringtone0
- Treatment
- Elevated CO2e0
- Outcome
- photosynthetic acclimatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Elevated CO2 induced photosynthetic acclimation in Harrington”
t0“barley leaves”
Claim · model-written summary
Photosynthetic acclimation in Harrington was linked to Rubisco protein depletion.
- Taxon
- barleyHordeum vulgaret0
- Material
- Harringtone0
- Gene
- Rubisco proteine0
- Outcome
- photosynthetic acclimatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic acclimation in Harrington that was linked with the depletion of Rubisco protein.”
t0“barley leaves”
Claim · model-written summary
Higher peduncle carbohydrate storage capacity in RSCL-89 was associated with better leaf carbohydrate balance.
- Taxon
- barleyHordeum vulgaret0
- Material
- RSCL-89e0
- Organ / stage
- pedunclee0
- Outcome
- better balance of leaf carbohydratese0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a higher peduncle carbohydrate-storage capacity in RSCL-89 was associated with a better balance of leaf carbohydrates”
t0“barley leaves”
Claim · model-written summary
Raising CO2 to 700 ppm increased photosynthetic rates.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Raising CO2 to 700 ppme0
- Outcome
- photosynthetic ratese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raising CO2 to 700 ppm increased photosynthetic rates”
t0“barley leaves”
Claim · model-written summary
Raising CO2 to 700 ppm reduced leaf carbohydrate content.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Raising CO2 to 700 ppme0
- Outcome
- leaf carbohydrate contente0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raising CO2 to 700 ppm increased photosynthetic rates with a reduction in leaf carbohydrate content”
t0“barley leaves”
Claim · model-written summary
Raising CO2 to 700 ppm improved N assimilation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Raising CO2 to 700 ppme0
- Outcome
- N assimilatione0
- Direction
- improvemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raising CO2 to 700 ppm increased photosynthetic rates with a reduction in leaf carbohydrate content and an improvement in N assimilation.”
t0“barley leaves”
Claim · model-written summary
Increased nitrate content was associated with up-regulation of photosynthesis and N-assimilation transcripts.
- Taxon
- barleyHordeum vulgaret0
- Gene
- genes of protein transcripts of photosynthesis and N assimilatione0
- Outcome
- nitrate contente0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in nitrate content was associated with up-regulation of genes of protein transcripts of photosynthesis and N assimilation”
t0“barley leaves”
Claim · model-written summary
Stomatal closure after CO2 reduction negatively affected photosynthetic performance and plant growth.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- decreasing the CO2 from 700 ppm to 400 ppme0
- Outcome
- photosynthetic performance and plant growthe0
- Direction
- negatively affectede0
- Qualifier
- stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing the CO2 from 700 ppm to 400 ppm revealed that both stomatal closure and inhibited expression of light-harvesting proteins negatively affected photosynthetic performance and plant growth.”
t0“barley leaves”
Claim · model-written summary
Inhibited expression of light-harvesting proteins after CO2 reduction negatively affected photosynthetic performance and plant growth.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- decreasing the CO2 from 700 ppm to 400 ppme0
- Gene
- light-harvesting proteinse0
- Outcome
- photosynthetic performance and plant growthe0
- Direction
- negatively affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreasing the CO2 from 700 ppm to 400 ppm revealed that both stomatal closure and inhibited expression of light-harvesting proteins negatively affected photosynthetic performance and plant growth.”
t0“barley leaves”
The same questions in other papers
co2 · physiology: photosynthesis · Hordeum vulgare (barley)Positive and negative results
4 papers in the same direction as this paper · 8 in the opposite direction
- negative
- no effect
- negative
9 papers more in this group
See all 13 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.