Introgression of allelic diversity from genetically distinct variants of Brassica rapa into Brassica napus canola and inheritance of the B. rapa alleles
Why this work is in the frame
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Bibliographic record
Abstract
Broadening of genetic diversity in spring oilseed Brassica napus L. (AACC, 2n = 38) canola is important for continued improvement of this crop. For this, the vast allelic diversity of the A genome of Brassica rapa L. (AA, 2n = 20) can be utilised. We investigated the prospect of developing canola-quality euploid B. napus lines carrying the alleles of B. rapa from F2 and BC1 (F1 × B. napus) populations of three B. napus × B. rapa interspecific crosses involving one B. napus and three genetically distinct B. rapa parents. In meiosis, the F1 AAC hybrid was expected to show normal segregation for the A genome chromosomes, whereas a range of C chromosomes from zero to nine was expected to be included in the gametes due to random segregation of this haploid set of chromosomes. Subsequent self-pollination, theoretically, should have eliminated the unpaired C chromosomes and resulted in a majority of B. rapa type. However, no B. rapa-type progeny were detected, and all progeny in the F8 conformed to be B. napus type. Correlation between parent and offspring generation, grown in greenhouse or field, was weak to moderate for seed glucosinolate content; however, the simpler genetic control of this trait, involving only the A genome loci, allowed the development of low-glucosinolate lines from this interspecific cross. Of the theoretical number of simple sequence repeat (SSR) marker alleles of B. rapa expected to be present in F4 and F8 populations, about 45% were detected in these populations, suggesting that the loss of these marker alleles occurred prior to the F4 generation. Loss of several SSR loci was also detected in these populations, which probably resulted from homoeologous pairing and rearrangements of the chromosomes of the A and C genomes. Genetic diversity analysis performed on the F8 progeny of two crosses showed that the two populations clustered into distinct groups, which demonstrates that they inherited SSR B. rapa alleles unique to each B. rapa parent. We conclude that B. rapa alleles from diverse sources can be readily incorporated into B. napus progeny by this interspecific crossing method.
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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 | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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 it