Timing and rate of genome variation in triticale following allopolyploidization
Bibliographic record
Abstract
The timing and rate of genomic variation induced by allopolyploidization in the intergeneric wheat-rye (Triticum spp. - Secale cereale L.) hybrid triticale (x Triticosecale Wittmack) was studied using amplified fragment length polymorphism (AFLP) analyses with 2 sets of primers, EcoRI-MseI (E-M) and PstI-MseI (P-M), which primarily amplify repetitive and low-copy sequences, respectively. The results showed that allopolyploidization induced genome sequence variation in triticale and that a great degree of the genome variation occurred immediately following wide hybridization. Specifically, about 46.3% and 36.2% of the wheat parental band loss and 74.5% and 68.4% of the rye parental band loss occurred in the F1 hybrids (before chromosome doubling) for E-M and P-M primers, respectively. The sequence variation events that followed chromosome doubling consisted of continuous modifications that occurred at a very small rate compared with the rate of variation before chromosome doubling. However, the rate of sequence variation involving the rye parental genome was much higher in the first 5 generations following chromosome doubling than in any subsequent generation. Surprisingly, the highest rate of rye genomic variation occurring after chromosome doubling was in C3 or later, but not in C1. The data suggested that the cytoplasm and the degree of the relationship between the parental genomes were the key factors in determining the direction, amount, timing, and rate of genomic sequence variation occurring during intergeneric allopolyploidization.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 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 | 0.001 |
| 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".