Effects of elevated CO<sub>2</sub>, drought and temperature on the water relations and gas exchange of groundnut<i>(Arachis hypogaea)</i>stands grown in controlled environment glasshouses
Bibliographic record
Abstract
Stands of groundnut ( Arachis hypogaea L. cv. Kadiri‐3) were grown in controlled environment glasshouses at mean atmospheric CO 2 concentrations of 375 or 700 μmol mol −1 and daily mean air temperatures of 28 or 32°C on irrigated or drying soil profiles. Leaf water (Ψ l ) and solute potential (Ψ s ), relative water content (RWC), stomatal conductance (g l ) and net photosynthesis (P n ) were measured at midday for the youngest mature leaf throughout the growing season. Elevated CO 2 and temperature had no detectable effect on the water relations of irrigated plants, but higher values of RWC, Ψ l and Ψ s were maintained for longer under elevated CO 2 during progressive drought. Turgor potential (Ψ p ) reached zero when Ψ l declined to −1.6 to −1.8 MPa in all treatments; turgor was lost sooner when droughted plants were grown under ambient CO 2 . A 4°C increase in mean air temperature had no effect on Ψ s in droughted plants, but elicited a small increase in Ψ l ; midday g l values were lower under elevated than under ambient CO 2 , and Ψ l and g l declined below −1.5 MPa and 0.25 cm s −1 , respectively, as the soil dried. Despite the low g l values recorded for droughted plants late in the season, P n was maintained under elevated CO 2 , but declined to zero 3 weeks before final harvest under ambient CO 2 . Concurrent reductions in g l and increases in water use efficiency under elevated CO 2 prolonged photosynthetic activity during drought and increased pod yields relative to plants grown under ambient CO 2 . The implications of future increases in atmospheric CO 2 for the productivity of indeterminate C 3 crops grown in rainfed subsistence agricultural systems in the semi‐arid tropics are discussed.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".