Identification of Maize Aquaporin Gene ZmPIP4c as a Signature of C4 Traits
Bibliographic record
Abstract
As a water transmembrane transporter, aquaporin can not only transport water in plants, but also transport small molecules such as CO 2 and H 2 O 2 , thus affecting physiological processes such as photosynthesis and so on. Although photosynthesis is critical to plant growth, the photosynthetic mechanisms of C 3 plants are different from that of C 4 plants as compared with C 3 leaves, C 4 leaves have typical Kranz structure and possess larger and well-developed bundle sheath cells which is favorable for water storage. We therefore performed bioinformatic and gene expression analyses on C 4 maize aquaporin, and identified a gene called ZmPIP4c which shows high specific expression in bundle sheath cells in leaves. thus is conducive to water transport into sheath cells and to balance the water supply in mesophyll cells. Further expression analysis on the ZmPIP4c along leaf gradient revealed that the expression trend of this gene was not only consistent with that of C 4 marker gene - NAD-malic enzyme gene ( NAD-ME ), a gene usually used to screen C 4 photosynthesis related transcripts, but also consistent with other C 4 genes such as phosphoenolpyruvate carboxylase gene ( PEPC ) and carbonic anhydrase gene ( CA ). The expressions of these genes all showed gradual increase from leaf base to leaf tip, suggesting that ZmPIP4c is a signature of C 4 traits. In addition, ZmPIP4c , NAD-ME , PEPC and CA also showed similar expression trends under the regulation of circadian rhythm, indicating that ZmPIP4c can provide optimal water environment for the efficient operation of C 4 cycle in bundle sheath cells under light, and avoid energy and water waste under dark. Moreover, the expressions of ZmPIP4c gene and of mesophyll-specifically-expressed genes, PEPC and CA , were all down-regulated under salt stress. As there exists water conduction signal between bundle sheath cells and mesophyll cells, down-regulation of ZmPIP4c gene may change the inner water solution environment within mesophyll cells, thereafter affecting the expresions of PEPC and CA genes. In brief, our study on ZmPIP4c gene of maize provides us a signature gene to study new C 4 traits that have not been reported yet, and helps us to understand the molecular mechanism how the cell-specific aquaporin gene mediates the C 4 cycle.
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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".