Thermal acclimation of photosynthesis in black spruce [<i>Picea mariana</i> (Mill.) B.S.P.]
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Bibliographic record
Abstract
We investigated the thermal acclimation of photosynthesis and respiration in black spruce seedlings [Picea mariana (Mill.) B.S.P.] grown at 22/14 degrees C [low temperature (LT)] or 30/22 degrees C [high temperature (HT)] day/night temperatures. Net CO(2) assimilation rates (A(net)) were greater in LT than in HT seedlings below 30 degrees C, but were greater in HT seedlings above 30 degrees C. Dark and day respiration rates were similar between treatments at the respective growth temperatures. When respiration was factored out of the photosynthesis response to temperature, the resulting gross CO(2) assimilation rates (A(gross)) was lower in HT than in LT seedlings below 30 degrees C, but was similar above 30 degrees C. The reduced A(gross) of HT seedlings was associated with lower needle nitrogen content, lower ribulose 1.5-bisphosphate carboxylase/oxygenase (Rubisco) maximum carboxylation rates (V(cmax)) and lower maximum electron transport rates (J(max)). Growth treatment did not affect V(cmax) : J(max). Modelling of the CO(2) response of photosynthesis indicated that LT seedlings at 40 degrees C might have been limited by heat lability of Rubisco activase, but that in HT seedlings, Rubisco capacity was limiting. In sum, thermal acclimation of A(net) was largely caused by reduced respiration and lower nitrogen investments in needles from HT seedlings. At 40 degrees C, photosynthesis in LT seedlings might be limited by Rubisco activase capacity, while in HT seedlings, acclimation removed this limitation.
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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) | 0.002 | 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 it