Gas exchange by pods and subtending leaves and internal recycling of CO 2 by pods of chickpea ( Cicer arietinum L.) subjected to water deficits
Bibliographic record
Abstract
Terminal drought markedly reduces leaf photosynthesis of chickpea ( Cicer arietinum L.) during seed filling. A study was initiated to determine whether photosynthesis and internal recycling of CO 2 by the pods can compensate for the low rate of photosynthesis in leaves under water deficits. The influence of water deficits on the rates of photosynthesis and transpiration of pods and subtending leaves in chickpea (cv. Sona) was investigated in two naturally‐lit, temperature‐controlled glasshouses. At values of photosynthetically active radiation (PAR) of 900 μmol m −2 s −1 and higher, the rate of net photosynthesis of subtending leaves of 10‐d‐old pods was 24 and 6 μmol m −2 s −1 in the well‐watered (WW) and water‐stressed (WS) plants when the covered‐leaf water potential (Ψ) was −0.6 and −1.4 MPa, respectively. Leaf photosynthesis further decreased to 4.5 and 0.5 μmol m −2 s −1 as Ψ decreased to −2.3 and −3.3 MPa, respectively. At 900–1500 μmol m −2 s −1 PAR, the net photosynthetic rate of 10‐d‐old pods was 0.9–1.0 μmol m −2 s −1 in the WW plants and was −0.1 to −0.8 μmol m −2 s −1 in the WS plants. The photosynthetic rates of both pods and subtending leaves decreased with age, but the rate of transpiration of the pods increased with age. The rates of respiration and net photosynthesis inside the pods were estimated by measuring the changes in the internal concentration of CO 2 of covered and uncovered pods during the day. Both the WW and WS pods had similar values of internal net photosynthesis, but the WS pods showed significantly higher rates of respiration suggesting that the WS pods had higher gross photosynthetic rates than the WW pods, particularly in the late afternoon. When 13 CO 2 was injected into the gas space inside the pod, nearly 80% of the labelled carbon 24 h after injection was observed in the pod wall in both the WW and WS plants. After 144 h the proportion of 13 C in the seed had increased from 19% to 32% in both treatments. The results suggest that internal recycling of CO 2 inside the pod may assist in maintaining seed filling in water‐stressed chickpea.
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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".