Mapping of QTLs associated with adaptation to mega-environments using Canadian x Chinese populations in soybean
Notice bibliographique
Résumé
Soybean ('Glycine max' [L.] Men) breeding programs frequently use elite lines as parents in crosses. The use of exotic germplasm as source of parents has been avoided due to a limited success of developing superior lines from the progeny. The reasons for this include the lack of adaptation of plant introductions (PI) and the difficulty in introgressing specific favourable alleles from the PI without accompanying negative alleles at other loci in the genome. The objectives of this thesis were: (a) to determine whether quantitative trait loci (QTL) appear in specific environments or universally; (b) to determine the existence of epistatic effects and evaluate their effect; (c) to determine which agronomic and morphological traits are correlated with yield; (d) to determine what additional traits were associated with yield QTL; (e) to determine if QTL associated with yield-component traits behave as mega-environment-universal QTL (QTLU) or megaenvironment-specific QTL (QTLSP); (f) to confirm yield and agronomic trait QTL in different genetic backgrounds. Two crosses between a Canadian elite line and a Chinese elite line were performed to develop two recombinant inbred line (RIL) populations, derived from the crosses, OAC Millennium * Heinong 3 8, and Pioneer 9071 * 8902. Both RIL populations were evaluated in multiple field locations in China and Canada from 2004 to 2006. A linkage map was developed based on OAC Millennium * Heinong 3 8 cross and 18 QTL for seed yield were identified. Of the 18, seven QTLU and 11 QTLSP were identified based on their behaviour across mega-environments. Multiple epistatic effects were identified across the map including QTL that are associated with yield and random QTL. Four traits (R1, R5, R8, and plant height), were correlated with seed yield. QTLu and QTLsp were identified for several agronomic traits. Yield QTL were not confirmed in the validation population derived from P9071 * 8902, which could imply that the seed yield QTL from the original population were not stable in this particular genetic background or alleles could be fixed in both parental lines. However, several agronomic trait QTLSP were found and one QTLSP was confirmed in the second population. An improved understanding of the type of QTL action as either universal or mega-environment specific and their interaction reported in this thesis may facilitate a strategic QTL-based introgression of genetic variation from exotic germplasm sources into breeding programs.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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 | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| 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 ».