Puccinia tritici-golanensis, a new wheat leaf rust pathogen from Yonatan region of the Golan Heights, Puccinia tritici-duri and Puccinia triticina typified, and their phylogenetic relationships
Bibliographic record
Abstract
Abstract The fungi causing diseases of cereal crops and other grasses, known as the brown leaf rusts, have historically been classified in the Puccinia recondita (sensu lato) species complex. Despite a long history of taxonomic effort, the recognition of the many included discrete taxa has been challenged due to overlapping morphological characters and primary grass hosts. More recent studies employing DNA sequence analyses identified multiple phylogenetic lineages in the complex, with two corresponding to species important to agricultural production, Puccinia triticina and P. recondita sensu stricto, on wheat and rye respectively. In this study, a second wheat-associated species, Puccinia tritici-duri , as yet known only from the Mediterranean region, and a new species recently discovered in the Golan Heights on wild emmer wheat, were examined and compared with P. triticina . We conducted detailed morphological examinations of telial and uredinial stages, DNA sequence analyses of the ribosomal DNA internal transcribed spacer region and elongation factor 1-α, and greenhouse inoculation experiments using a broad selection of Triticum and Aegilops telial hosts. The results demonstrated that the three wheat-associated species are distinct, placed in three unrelated lineages within the P. recondita complex. They confirm an overlap in host associations, which varied depending on species or cultivar. Based on the combined evidence, we formally propose the new species as Puccinia tritici-golanensis and provide comprehensive notes for the other two species, supported by descriptions and illustrations.
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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) | 0.000 | 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 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".