Physiologic specialization of wheat leaf rust [<i>Puccinia triticina</i>] in Canada in 2000
Notice bibliographique
Résumé
Virulence in the wheat leaf rust [Puccinia triticina] population was surveyed throughout Canada in 2000, as part of an ongoing effort to monitor changes that could affect Canadian wheat. Twenty-three virulence phenotypes, differentiated on 16 wheat lines with single resistance genes, were detected from 122 infected-leaf collections. Virulence phenotypes MBDS (54.1%), TGBJ (21.6%), and THBJ (5.7%) were most frequently identified. The overall distribution of virulence phenotypes in Canada in 2000 was similar to that in 1999, although seven virulence phenotypes (MBPS, PBDG, PBDQ, SBDG, SGBJ, TBPS, and TGMJ) found in 2000 were not present in either 1998 or 1999. There were four virulence phenotypes (MBDS, 50.0%; TKBJ, 25.0%; THBJ, 12.5%; and THMJ, 12.5%) detected among eight isolates from Ontario. Virulence phenotypes TKBJ and THMJ were relatively rare in other regions. Of 21 virulence phenotypes detected among 339 isolates from Manitoba and Saskatchewan, the most common were MBDS (56.0%), TGBJ (22.4%), and THBJ (5.6%). From Alberta, there were six virulence phenotypes among 19 isolates and the most common were PBDG (42.1%), MBDS (21.1%), and TGBJ (15.8%). While each region had unique virulence phenotypes, the virulence phenotypes MBDS and THBJ were common to all regions. The percentage of virulence to resistance gene Lr16 was 35.5%, which is similar to that in 1999 (35.3%). Twenty-three of the 27 isolates virulent to Lr16 that were tested on adult plants were also virulent to Lr13 and would be virulent to the predominant wheat cultivar in western Canada, 'AC Barrie', which contains these resistance genes. Less than 1% of the isolates in Canada were virulent to wheat lines containing either Lr9, Lr11, or Lr18 while more than 95% were virulent to wheat lines containing either Lr1, Lr3, Lr10, or Lr14a. Frequency of virulence was intermediate for resistance genes Lr2a, Lr2c, Lr16, Lr24, Lr26, Lr3ka, Lr17, Lr30, and LrB. From a subset of 49 isolates, representing 21 of the 23 virulence phenotypes identified in 2000, 40 were virulent to both the adult-plant genes Lr12 and Lr13. Of the 49 isolates, none were virulent to the seedling resistance genes Lr19, Lr21, Lr29, and Lr32, all were virulent to Lr20 and Lr15, while some were virulent to Lr2b, Lr3bg, Lr14b, Lr23, Lr25, and Lr28.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,002 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».