Genetics of Resistance to Stagonospora Nodorum Blotch of Hexaploid Wheat
Bibliographic record
Abstract
The genetic control of resistance to Stagonospora nodorum blotch (SNB), caused by Stagonospora nodorum (Berk.) E. Castell. and E.G. Germano, an important foliar and head disease of wheat (Triticum aestivum L.) in many parts of the world, was investigated in five hexaploid winter wheat and one hexaploid spring wheat genotypes. F1 plant reaction and segregation data for resistance to a single Saskatchewan isolate of S. nodorum from various combinations of F2, random inbred line and doubled haploid (DH) populations of each resistant × susceptible cross indicated that single recessive genes controlled resistance in winter wheat genotypes ‘Red Chief’, ‘Hadden’, ‘Missouri Queen’, ‘Coker 76‐35’ and 81IWWMN 2095, and in spring wheat line 86ISMN 2137. All disease tests were performed on plants at the three‐leaf stage under controlled environmental conditions. Tests of F1, F2, F2:3, and DH populations from resistant × resistant crosses indicated that these six genotypes carried the same gene. The chromosomal location of this gene was determined by cytogenetic analysis with ‘Chinese Spring’ monosomic and ditelosomic lines. Tests of F1 and F2 plants from crosses between Red Chief and Chinese Spring monosomic and ditelosomic lines indicated that the gene shared by these hexaploid wheat genotypes is located on the long arm of chromosome 3A.
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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 | 0.000 | 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".