Rôles biologiques des antiports vacuolaires NHX : acquis et perspectives d’amélioration génétique des plantes
Bibliographic record
Abstract
NHX antiporters are membrane proteins that mediate cation and proton exchanges across vacuolar membranes. In particular, they catalyze the Na+–H+exchanges and, consequently, sequester Na+into vacuoles. The latter mechanism protects essential enzymatic reactions in the cytoplasm from toxicity due to excess Na+levels, while adjusting turgor by means of vacuolar Na+as an osmoticum. The function of vacuolar NHX antiporters in plants has been studied primarily in the context of salinity tolerance. The expression of induction of NHX-type genes in response to NaCl treatment was observed for most NHX-type genes characterized, and their overexpression allowed to confer an improved tolerance to salinity, initially in transgenic model plants ( Arabidopsis thaliana (L.) Heynh. and tobacco) and, subsequently, in cultivated plants (tomato, rice, wheat, etc.). As many genes encoding these antiporters have been cloned from both salt-sensitive and salt-tolerant species and because multiple isoforms can be identified in genomes that have been sequenced, it is likely that these antiporters assume functions at various levels beside providing tolerance to salinity. Indeed, in addition to playing a role in other known functions such as pH regulation, ion homeostasis, and osmotic and turgor regulation, they also have an important role in diverse physiological processes, including control of cell growth and proliferation, vesicle biogenesis and trafficking, protein targeting, and more specifically, leaf development, blue-flower coloration, and grape berry maturation. If we take into account the high probability that vacuolar NHX antiporters play a role in multiple physiological processes, it would be possible, by exploiting the available information, to use several molecular methods, such as overexpression or silencing of NHX-type genes, to achieve the selection and improvement of interesting plant characters, including flower coloration, fruit maturation, and tolerance to salinity and drought.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".