EFFECTS OF NITRATE AND AMMONIUM ON WATER RELATIONS OF TREMBLING ASPEN SEEDLINGS IN SOLUTION CULTURE
Bibliographic record
Abstract
We examined the effects of high concentrations (4, 8, or 16 mM) of nitrate (NO3) and ammonium (NH4) on water relations and growth of trembling aspen seedlings in solution culture. In contrast to 16 mM ammonium, after four weeks of treatments, the 16 mM nitrate treatment resulted in the highest growth rates, root hydraulic conductivity and aquaporin-mediated root water flux. At lower (4 and 8 mM) ammonium concentrations, seedling growth and water relations were comparable to equivalent nitrate concentrations. When after the four weeks of treatments, ammonium concentrations were reduced by 50% (to 2, 4 and 8 mM) for additional 4 weeks, slight increases in seedling growth and water relations as well as decreases in mortality were observed indicating that aspen seedlings were capable of recovery from higher ammonium concentrations. The results indicate that aspen seedlings are tolerant of high nitrate concentrations, but intolerant of high ammonium concentrations. The study also suggested that ammonium was not toxic to aspen seedlings at moderate concentrations and that the seedlings were capable of assimilating and utilizing both ammonium and nitrate as a nitrogen source.
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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".