Identification and Molecular Mapping of the Powdery Mildew Resistance Gene in Wheat Cultivar Yumai 66
Bibliographic record
Abstract
Powdery mildew,caused by Blumeria graminis f.sp.tritici,is one of the most important diseases of wheat(Triticum aestivum L.)worldwide.Breeding for resistance is the most economical and effective method for controlling the disease.Yumai 66,a common wheat cultivar derived from a wheat-triticale cross,is resistant to a wide spectrum of wheat powdery mildew isolates from both China and Canada.In the present study,genetic analysis indicated that Yumai 66 carried a single dominant gene for resistance to powdery mildew,designated tentatively PmYm66.The segregating F2 populations and their F3 progenies of the crosses Yumai 66/Mingxian 169 and Yumai 66/ND3509 were used for bulked segregation analysis (BSA).Four molecular markers were associated with PmYm66 in an order of EST48–EST83 (EST84)–Xksum193–PmYm66.These SSR and EST markers were assigned to the distal bin of chromosome 2AL by means of Chinese Spring nullisomic-tetrasomic,ditelisomic,and deletion lines.The reaction types of Yumai 66 to 21 B.graminis f.sp.tritici isolates from China was different from that of Pm4a and Pm4b located on chromosome 2AL.
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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 | 0.000 | 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) | 0.001 | 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".