Comparison of the performance of bromoxynil-resistant and susceptible near-isogenic populations of oilseed rape
Bibliographic record
Abstract
Bromoxynil herbicide resistance is the newest type of broad-spectrum, non-selective herbicide resistance to be introduced into oilseed rape (Brassica napus L.). This herbicide resistance is conferred by a single transgene (the oxy gene), taken from a soil bacterium, which confers the ability to metabolize hydroxybenzonitrile herbicides such as bromoxynil. The level of resistance to bromoxynil herbicide in oilseed rape is high, but it is not known whether there are any performance changes associated with the oxy transgene or with the derived herbicide resistance. To determine if there are changes in performance related to the oxy transgene, or the derived herbicide resistance, two near-isogenic transgenic bromoxynil-resistant populations, with two different forms of the oxy gene, Westar 235 and Westar 237, were developed at the University of Manitoba, grown in the field in Manitoba for several years and evaluated for comparative performance. Westar 235 and Westar 237 near-isogenic populations, either sprayed with bromoxynil at 280 g a.i. ha–1 or left unsprayed, were compared with the non-transgenic near-isogenic population cultivar, Westar, in Winnipeg, Carman, and Portage la Prairie from 1994 to 1997. There were no consistent differences in the performance of the sprayed or unsprayed transgenic near-isogenic populations in comparison to Westar for any trait. The few significant and minimal differences that were found were evenly divided between positive effects and negative effects of the oxy gene and derived herbicide resistance. There were no significant effects of spraying bromoxynil herbicide detected in paired comparisons of Westar 235 and Westar 237 sprayed versus Westar 235 and Westar 237 unsprayed, respectively. The effects of the oxy transgenes and the effects of bromoxynil spraying of herbicide-resistant lines were negligible, indicating that there is little, if any biological cost associated with the bromoxynil resistance transgenes or related herbicide resistance. Key words: Transgenic oilseed rape, Brassica napus, biological cost
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".