Abstract
The response of plants to elevated atmospheric [CO2] is highly dynamic and influenced by developmental stage, yet its role in photosynthetic acclimation remains underexplored. This study examines the physiological and molecular responses of wheat (Triticum durum, var. Amilcar) to elevated [CO2] (700 ppm vs. 400 ppm) at two distinct developmental stages: the vegetative stage at the end of the elongation stage and the reproductive stage at the beginning of ear emergence (Z39 and Z51, respectively). Wheat plants at the developmental stage Z39, cultivated under elevated [CO2], maintained photosynthetic rates despite a carbohydrate build-up. However, at Z51, photosynthetic acclimation became more evident as the decline in Rubisco carboxylation capacity (Vcmax) persisted, but also stomatal conductance and diffusion were decreased. This was accompanied by the up-regulation of the CA1 and CA2 genes, likely as a compensatory mechanism to maintain CO2 supply. Additionally, hormonal adjustments under elevated [CO2], including increased auxin and bioactive cytokinins (zeatin and isopentenyl adenine), may have contributed to delayed senescence and nitrogen remobilization, sustaining carbon assimilation despite biochemical constraints. These findings highlight the developmental regulation of photosynthetic acclimation, emphasizing the need for the stage-specific assessments of crop responses to future atmospheric conditions.
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Claims 9
Claim · model-written summary
At Z39 under elevated CO2, wheat maintained photosynthetic rates despite carbohydrate buildup.
- Taxon
- Wheat
Triticum aestivume0 - Organ / stage
- Z39e0
- Treatment
- elevated [CO2]e0
- Outcome
- photosynthetic ratese0
- Direction
- maintainede0
- Qualifier
- despite a carbohydrate build-upe0
- Comparator
- 400 ppmt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat plants at the developmental stage Z39, cultivated under elevated [CO2], maintained photosynthetic rates despite a carbohydrate build-up”
t0“(700 ppm vs. 400 ppm)”
Claim · model-written summary
At Z51, Rubisco carboxylation capacity remained reduced under elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Z51e0
- Treatment
- Elevated [CO2]t0
- Outcome
- Rubisco carboxylation capacity (Vcmax)e0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Z51, photosynthetic acclimation became more evident as the decline in Rubisco carboxylation capacity (Vcmax) persisted”
t0“Elevated [CO2] in Durum Wheat”
Claim · model-written summary
At Z51, stomatal conductance and diffusion decreased.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- Z51e0
- Treatment
- Elevated [CO2]t0
- Outcome
- stomatal conductance and diffusione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Z51, photosynthetic acclimation became more evident as the decline in Rubisco carboxylation capacity (Vcmax) persisted, but also stomatal conductance and diffusion were decreased”
t0“Elevated [CO2] in Durum Wheat”
Claim · model-written summary
CA1 and CA2 were upregulated with acclimation at Z51.
- Taxon
- WheatTriticum aestivumt0
- Gene
- CA1 and CA2e0
- Outcome
- up-regulation of the CA1 and CA2 genese0
- Direction
- up-regulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was accompanied by the up-regulation of the CA1 and CA2 genes”
t0“Wheat”
Claim · model-written summary
CA1 and CA2 upregulation likely helped maintain CO2 supply.
- Taxon
- WheatTriticum aestivumt0
- Gene
- CA1 and CA2e0
- Outcome
- maintain CO2 supplye0
- Qualifier
- likely as a compensatory mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“up-regulation of the CA1 and CA2 genes, likely as a compensatory mechanism to maintain CO2 supply”
t0“Wheat”
Claim · model-written summary
Auxin increased under elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- elevated [CO2]e0
- Outcome
- auxine0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hormonal adjustments under elevated [CO2], including increased auxin and bioactive cytokinins (zeatin and isopentenyl adenine)”
t0“Wheat”
Claim · model-written summary
Bioactive cytokinins increased under elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- elevated [CO2]e0
- Outcome
- bioactive cytokinins (zeatin and isopentenyl adenine)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hormonal adjustments under elevated [CO2], including increased auxin and bioactive cytokinins (zeatin and isopentenyl adenine)”
t0“Wheat”
Claim · model-written summary
Hormonal adjustments may have delayed senescence and nitrogen remobilization.
- Taxon
- WheatTriticum aestivumt0
- Compound
- auxin and bioactive cytokinins (zeatin and isopentenyl adenine)e0
- Outcome
- delayed senescence and nitrogen remobilizatione0
- Qualifier
- may have contributede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hormonal adjustments under elevated [CO2], including increased auxin and bioactive cytokinins (zeatin and isopentenyl adenine), may have contributed to delayed senescence and nitrogen remobilization, sustaining carbon assimilation despite biochemical constraints”
t0“Wheat”
Claim · model-written summary
Stage-specific assessments of crop responses to future atmospheric conditions are needed.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- stage-specific assessments of crop responses to future atmospheric conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“emphasizing the need for the stage-specific assessments of crop responses to future atmospheric conditions”
t0“Wheat”
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