Identification and molecular characterization of the <i>Brachypodium distachyon NRT2</i> family, with a major role of <i>BdNRT2.1</i>
Bibliographic record
Abstract
The small monocot plant Brachypodium distachyon is rapidly emerging as a powerful model system to study questions unique to the monocot crops. An extensive BLAST search was carried to identify putative orthologues of the Arabidopsis NRT2 genes in the fully sequenced Brachypodium genome. Seven genes encoding putative high-affinity nitrate transporters (BdNRT2) were identified. Transcriptional analysis of individual BdNRT2 gene under various nitrogen sources and levels in the wild-type and a T-DNA mutant of BdNRT2.1 were performed. A transgenic approach was taken to complement the bdnrt2.1 mutant. BdNRT2.1 and BdNRT2.2 were strongly induced by nitrate resupply to nitrogen-starved plants and were classified as inducible genes. BdNRT2.5 was found to be repressed by nitrate resupply whereas other members were constitutively expressed in the root. Interestingly, higher ammonium concentrations also triggered similar gene expression regulation, suggesting BdNRT2 gene expression was also governed by internal nitrogen status, not just external nitrate concentrations. In bdnrt2.1 mutant, the high-affinity transporter system (HATS) was reduced by 30% and BdNRT2.2 and BdNRT2.6 were differentially regulated. This pioneering research demonstrates that genes in the BdNRT2 family have diverse roles, differing from the Arabidopsis AtNRT2 family, in response to various nitrogen conditions. BdNRT2.1 serves as a key member of the family.
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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".