Fusarium Head Blight Reaction of Langdon Durum‐<i>Triticum dicoccoides</i> Chromosome Substitution Lines
Bibliographic record
Abstract
Fusarium head blight (FHB), caused by Fusarium graminearum Schwabe, is a serious disease problem on durum wheat (Triticum turgidum L. var. durum) in the USA. To date, the resistance to FHB available in hexaploid wheat (T. aestivum L.) sources has not been transferred successfully to tetraploid durum. In the 1980s, USDA geneticist L.R. Joppa produced a set of disomic lines [LDN(DIC)] derived from wild emmer (T. turgidum L. var. dicoccoides). Each line had a different pair of chromosomes from T. dicoccoides substituted for the corresponding ‘Langdon’ durum chromosomes. The purpose of this study was to determine if any of the LDN(DIC) lines showed useful levels of resistance to FHB. We tested these lines for FHB response by inoculation with F. graminearum in the greenhouse. Inoculation was accomplished via the single spikelet method, in which a droplet of conidiospore suspension is placed into one spikelet per spike followed by mist–high humidity for 3 d to establish infection. After 21 d, spikes were scored for extent of FHB symptoms and the average disease severity of the lines compared. A low disease severity score in this test indicated the presence of resistance to FHB in that line. Each test was replicated and the tests were done five times. In each test, some lines differed significantly. One line, LDN(DIC‐3A), was consistently less susceptible and another line, LDN(DIC‐2A), was consistently more susceptible than the parent Langdon durum, which itself showed an intermediate FHB reaction. Several other LDN(DIC) lines showed a trend either for increased or reduced susceptibility to FHB. Since each line differs by a single chromosome pair, the results suggest that genes affecting FHB resistance are present on several different T. dicoccoides or Langdon durum chromosomes.
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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) | 0.002 | 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".