Photoprotection, not increased growth, characterizes the response of Engelmann spruce (<i>Picea engelmannii</i>) seedlings to high light, even when resources are plentiful
Bibliographic record
Abstract
• To investigate the effects of resource limitation on the use of light by Engelmann spruce seedlings (Picea engelmannii), we examined the effects of nitrogen (N) supply on growth and physiological acclimation. • Seedlings were grown under a factorial combination of two levels of light (100%, 33% full light) and two levels of N-supply (100 mg l−1 and 10 mg l−1). Biomass, foliage physiology, and pigment composition were measured. • No significant differences were found in growth or photosynthetic capacity between seedlings grown under high and low light, regardless of whether seedlings were grown under conditions of high or low N-supply. Both a decrease in the capacity for light capture and an increase in the capacity for thermal dissipation of excess absorbed light occurred with growth at high relative to low light as well as at low relative to high N-supply. • Damage to foliage from excess light appeared to be avoided through a combination of downward adjustments in chlorophyll and upward adjustments in photoprotective xanthophyll cycle carotenoids.
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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) | 0.001 | 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 | 0.000 |
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 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".