Cold acclimation inhibits CO<sub>2</sub>-dependent stimulation of photosynthesis in spring wheat and spring rye
Bibliographic record
Abstract
We assessed the effects of short-term elevated CO 2 on the light-saturated rates of photosynthesis (A sat ) of spring (‘SR4A’, ‘Katepwa’) and winter (‘Musketeer’, ‘Norstar’) wheat ( Triticum aestivum L.) and rye ( Secale cereale L.) cultivars grown at ambient CO 2 (380 µmol C·mol –1 ) at either 20/16 °C (nonacclimated, NA) or 5/5 °C (cold acclimated, CA). In spring wheat–rye, cold acclimation decreased CO 2 -stimulation of A sat by 45%–60% relative to NA controls following a short-term (80 h) shift of plants from ambient to elevated CO 2 (700 µmol C·mol –1 ). In contrast, in winter wheat–rye, cold acclimation enhanced CO 2 -stimulation of A sat by 15%–35% relative to NA controls upon a shift to elevated CO 2 . The stimulation observed for CA spring cultivars was about 60% less than that of CA winter cultivars. We conclude that a short-term exposure of spring cultivars to elevated CO 2 cannot compensate for the cold acclimation-induced inhibition of A sat . Cold acclimation of spring cultivars appeared to exacerbate Rubisco CO 2 substrate limitations present under ambient CO 2 . Furthermore, CA spring cultivars were unable to adjust their short-term temperature sensitivity of A sat under elevated CO 2 compared with the winter cultivars.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".