Juvenile leaves of <i>Rhus glabra</i> have higher photosynthetic thermal tolerance than mature leaves
Bibliographic record
Abstract
We have previously shown that juvenile leaves of Rhus glabra L. growing in a field setting were consistently 2–3 °C warmer than mature leaves during periods of high irradiance. An experiment was done to test the hypothesis that these differences in leaf temperature lead to increased photosynthetic temperature tolerance in juvenile leaves when compared with cooler, mature leaves. Significant differences were found between the leaf stages with detached juvenile leaves having a slightly higher T15 (the temperature causing a 15% drop in maximum photochemical efficiency) than mature leaves (43.5 vs. 41.1 °C). Additionally, measurement of the effect of temperature on actual quantum yield (ΦPSII) showed maximum activity at 35 °C for mature leaves, whereas juvenile leaves exhibited a broader temperature response with similar activities between 30 and 40 °C. The 2 °C difference in T15 roughly coincided with observed average differences between juvenile and mature leaf temperature we observed in the field, indicating that higher juvenile leaf temperature is a factor in promoting their enhanced temperature tolerance.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".