Phylogeny of tribe Brassiceae (Brassicaceae) based on chloroplast restriction site polymorphisms and nuclear ribosomal internal transcribed spacer and chloroplast<i>trn</i>L intron sequences
Bibliographic record
Abstract
Using sequence data from the ITS region (internal transcribed spacers ITS-1 and ITS-2 of nuclear DNA and the 5.8 rRNA gene), chloroplast DNA (cpDNA) sequence data from the trnL intron, and cpDNA restriction site polymorphism data, we examined the evolutionary relationships of the tribe Brassiceae (Brassicaceae). A group of approximately 50 genera, it is distinguished by the presence of conduplicate cotyledons and (or) heteroarthrocarpic fruit. cpDNA restriction site data and ITS, trnL, and combined ITS/trnL sequence data were obtained for 22, 104, 94, and 87 taxa in the tribe, respectively. Results from maximum parsimony analyses of the cpDNA and ITS and ITS/trnL sequence data showed a monophyletic origin for the tribe, with the inclusion of controversial members Calepina, Conringia, and Orychophragmus. ITS- and ITS/trnL-based clades corresponded to taxonomic subtribes: Vellinae, Zillinae, and Savignyinae; but as with previous cpDNA studies, there was little support for subtribes Brassicinae, Raphaninae, and Moricandiinae. Although there was no support for the Rapa/Oleracea or Nigra cpDNA lineages, many cpDNA subclades within each of them were evident in the ITS- and ITS/trnL-based phylogeny. The trnL sequence data provided little or no resolution of tribal or subtribal limits. The ITS data indicated polyphyletic origins for Brassica, Diplotaxis, and Erucastrum.Key words: Brassiceae, Calepina, Conringia, Orychophragmus, ITS, trnL, cpDNA restriction site polymorphisms.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".