Substantial role for carbonic anhydrase in latitudinal variation in mesophyll conductance of <i>Populus trichocarpa</i> Torr. & Gray
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Bibliographic record
Abstract
Abstract In Populus trichocarpa (black cottonwood), net photosynthesis ( A n ) varies with latitude and, in northern genotypes, is supported by higher stomatal conductance ( g s ). We report here a parallel cline in mesophyll conductance ( g m ) and link this variation to carbonic anhydrase (CA) activity. Using concurrent carbon isotope discrimination and chlorophyll fluorescence methods, we examined the effects of acetazolamide, an inhibitor of CA, on g m in six representative genotypes (three from either end of the north‐south cline). Acetazolamide reduced CA activity, g m , g s , chloroplast CO 2 concentration ( C c ) and A n at normal CO 2 (400 μ mol mol −1 ), the latter being reversible at saturating CO 2 . Absolute reductions in A n , g m and CA activity were greater in northern genotypes than in southern genotypes ( P < 0.025) but percent reductions were similar. In contrast, northern genotypes showed lower percent reduction in C c compared to southern genotypes ( P < 0.025). The northern genotypes had greater CA activity relative to both leaf area (two‐fold) and mass (1.8‐fold) ( P < 0.016). The relationship between CA activity and g m was similar whether the variation was inherent or inhibitor induced. We suggest that greater CA activity contributes to higher g m in northern P. trichocarpa genotypes, but other diffusion pathway components may also be involved.
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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 it