Characterizing the factors contributing to intraspecific pollen-mediated gene flow between cropped and volunteer spring wheat (Triticum aestivum L.)
Notice bibliographique
Résumé
Transgenic crops have been widely adopted throughout many parts of the world.Their popularity is not without concern regarding the ecological and agricultural quandaries associated with their cultivation.Several traits have recently been incorporated into hexaploid wheat (Trticum aestivunt L.) using recombinant DNA technology and therefore, the resulting transgenic lines may require segregation from non-transgenic wheats to satisfy international markets.However, segregation may be complicated by the underlying biological characteristics of wheat plants that collectively allow for the transfer of genes between cropped and volunteer spring wheat populations.To this end, the objectives of this thesis were: i) to identify ahybridization window in spring wheat crops that would facilitate temporal isolation, thus minimizing flowering synchrony and pollen-mediated gene flow (PMGF); ii) to determine whether increasing crop density of spring wheat crops which are taller than volunteer genotypes could reduce flowering synchrony and PMGF between the two populations and; iii) to ascertain whether a relationship exists between flowering synchrony and PMGF such that flowering synchrony could be used to predict PMGF.Synchrony of flowering and PMGF were always greatest when seedling emergence timing of volunteers coincided with the wheat crop.Flowering synchrony ranged between 0%o and 86% depending on emergence timing, and a distinct hybridization window 125_ GDD in length was indentified in which seedling emergence of volunteer wheat plants would result in PMGF regardless of volunteer density.Volunteers emerging after the wheat crop (which cannot be selectively controlled) contributed substantially to PMGF and although plant height appeared to have some merit in reducing flowering synchrony, it had no influence on PMGF.Increasing crop density, on the other hand, resulted in an exponential decline in PMGF in all siteyears.However, further reductions above the recommended planting rate of 250 plants --t *e.e not realized.Overall, this research suggests that the potential for PMGF between volunteer wheat plants and a wheat crop is real and perhaps absolute.Nevertheless, results presented in this thesis lend support for the possibility of coexistence between transgenic and non-transgenic wheat within an appropriate framework that includes the establishment of realistic thresholds for admixture.
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 distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| 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 | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 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 tête enseignante, 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 ».