Rapid genomic changes in interspecific and intergeneric hybrids and allopolyploids of Triticeae
Bibliographic record
Abstract
Allopolyploidy is preponderant in plants, which often leads to speciation. Some recent studies indicate that the process of wide hybridization and (or) genome doubling may induce rapid and extensive genetic and epigenetic changes in some plant species and genomic stasis in others. To further study this phenomenon, we analyzed three sets of synthetic allopolyploids in the Triticeae by restriction fragment length polymorphism (RFLP) using a set of expressed sequence tags (ESTs) and retrotransposons as probes. It was found that 40-64.7% of the ESTs detected genomic changes in the three sets of allopolyploids. Changes included disappearance of parental hybridization fragment(s), simultaneous appearance of novel fragment(s) and loss of parental fragment(s), and appearance of novel fragment(s). Some of the changes occurred as early as in the F1 hybrid, whereas others occurred only after allopolyploid formation. Probing with retrotransposons revealed numerous examples of disappearance of sequences. No gross chromosome structural changes or physical elimination of sequences were found. It is suggested that DNA methylation and localized recombination at the DNA level were probably the main causes for the genomic changes. Possible implications of the genomic changes for allopolyploid genome evolution are discussed.
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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".