Effects of heat stress on gas exchange and photosystem II (PSII) photochemical activity of <i>Phillyrea angustifolia</i> exposed to elevated CO<sub>2</sub> and subsaturating irradiance
Bibliographic record
Abstract
Gas exchange and chlorophyll a fluorescence measurements were performed simultaneously on leaves of Phillyrea angustifolia L. to assess the effects of heat stress (30 min at 40 °C) on photosynthesis and photosystem II (PSII) photochemical efficiency of plants grown at ambient CO 2 and exposed to an elevated CO 2 concentration (800 µmol·mol –1 ) and 300 µmol photons·m –2 ·s –1 . No significant difference was found in the heat-induced decreases of net photosynthesis (P N ), quantum yield of PSII electron transport (Φ PSII ), and maximum PSII photochemical efficiency (F v /F m ) between plants exposed to ambient and elevated CO 2 concentrations, showing that elevated CO 2 was not able to reduce the potential for photoinhibition at high temperatures under moderate light conditions. The heat-induced decrease of P N was higher than that of Φ PSII indicating that reductive power was more utilized in non-assimilatory processes than in CO 2 fixation at both CO 2 treatments. This result suggested that impairment of the Calvin cycle rather than electron transport inhibition was the main cause of the limitation in CO 2 fixation.
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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".