Photosynthesis, immediate export and carbon partitioning in source leaves of C<sub>3</sub>, C<sub>3</sub>‐C<sub>4</sub> intermediate, and C<sub>4</sub><i>Panicum</i> and <i>Flaveria</i> species at ambient and elevated CO<sub>2</sub> levels
Bibliographic record
Abstract
ABSTRACT Immediate export in leaves of C 3 ‐C 4 intermediates were compared with their C 3 and C 4 relatives within the Panicum and Flaveria genera. At 35 Pa CO 2 , photosynthesis and export were highest in C 4 species in each genera. Within the Panicum , photosynthesis and export in ‘type I’ C 3 ‐C 4 intermediates were greater than those in C 3 species. However, ‘type I’ C 3 ‐C 4 intermediates exported a similar proportion of newly fixed 14 C as did C 4 species. Within the Flaveria , ‘type II’ C 3 ‐C 4 intermediate species had the lowest export rather than the C 3 species. At ambient CO 2 , immediate export was strongly correlated with photosynthesis. However, at 90 Pa CO 2 , when photosynthesis and immediate export increased in all C 3 and C 3 ‐C 4 intermediate species, proportionally less C was exported in all photosynthetic types than that at ambient CO 2 . All species accumulated starch and sugars at both CO 2 levels. There was no correlation between immediate export and the pattern of 14 C‐labelling into sugars and starch among the photosynthetic types within each genus. However, during CO 2 enrichment, C 4 Panicum species accumulated sugars above the level of sugars and starch normally made at ambient CO 2 , whereas the C 4 Flaveria species accumulated only additional starch.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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; both teacher heads agree on what is shown here.
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".