Effects of altitude on tracheid differentiation and lignification of Norway spruce
Bibliographic record
Abstract
The effect of altitude on lignification is important in developing an understanding of what drives natural variation in wood properties. Cambia of two Norway spruce trees, growing at altitudes of 580 and 1260 m a.s.l., were periodically sampled to measure tracheid dimensions and cellular lignin content. The low-elevation tree showed a higher rate of cell division with thicker cell walls and wider growth rings. The maturation phase of tracheids at high elevation was completed by the end of October while low elevation latewood tracheids were still lignifying. As revealed by ultraviolet microscopy, lignin content in single cells, as well as in complete tree-rings, was higher at high elevation. Rank correlation analysis indicated high negative correlation between lignin content of tracheid cell walls and corresponding wall thickness. It is hypothesized that trees growing at higher altitudes compensate for the thinner cell walls with an increased lignin content which helps to maintain mechanical integrity of the xylem.Key words: altitude, lignin, tracheid, wood formation, ultraviolet microscopy.
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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".