Genomic constitution and phylogenetic position of several New Zealand Triticeae species revealed by two single copy nuclear genes
Bibliographic record
Abstract
Three genera of Triticeae, Elymus, Stenostachys and Australopyrum, are described in the New Zealand flora. Cytological analyses suggested that five basic genomes (St, H, Y, P and W) donated by different diploid species in different combinations exist in the genera Elymus and Stenostachys, whereas Australopyrum species contain the W genome only. Morphological and cytogenetic data suggested that the genome constitution for both E. apricus and E. multiflorus is StYW. Chloroplast DNA and ITS data supported the genome constitution of these Elymus species, but the HW genome constitution was assigned to the Stenostachys species. In this study, sequences of two single copy nuclear genes, RPB2 and DMC1, were used to confirm or refute the genome constitutions of the two Stenostachys species and the two Elymus species from New Zealand, and to analyse their phylogenetic relationships with other Elymus species. Our RPB2 and DMC1 data confirmed that the genome constitution of hexaploid E. apricus is StWY, and tetraploid S. gracilis is HW. The presence of the StW genome in hexaploid E. multiflorus, and the W genome in tetraploid S. laevis is also confirmed. No obvious St genome differentiation between New Zealand and non-New Zealand species is observed. The H genomes in the S. gracilis and S. laevis are closely related to the H genome from North American species, indicating that the H genomes in these two New Zealand species might originate from North American Hordeum species.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.001 | 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 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".