Characterization of Genetic Sources Associated with Restorability and Seed Dimension in Arkansas Restorer Rice Lines
Notice bibliographique
Résumé
Hybrid rice (Oryza sativa L.) breeding offers a significant opportunity to enhance rice production, and the cultivation of a male sterile line is the most important factor in the success of cross-breeding. One of the key elements of hybrid rice production is to develop a restorer line that is assigned as the male parent. The restorer lines provide viable pollen for fertilization of the male sterile plant due to the presence of a restorer gene (Rf) in their genomes. Any superior restorer line applied to hybrid rice production must contain genes/quantitative trait loci (QTL) associated with the desirable agronomic traits in its genome. The objectives in this study were to 1) identify the genetic source of restorability in two Arkansas-developed restorer lines, 367R and 396R, and 2) identify QTLs associated with seed dimensions in two restorer lines. The study was performed at the University of Arkansas System Division of Agriculture, Rice Research and Extension Center, Stuttgart, Arkansas. Three populations resulting from crosses between 367R and Arkansas advanced lines RU1501139, and 396R crossed with Tropical Japonica cultivar “Newbonnet (PI474580) or Arkansas advanced line RU1501047 were developed. Five F3 plants from each F2:3 line were selected for testcross with an Arkansas developed cytoplasmic male sterile (CMS) line 873A. Five testcross F1 plants resulting from each selected pollen donor plant were grown in the greenhouse. Pollen fertility was tested via a pollen stain procedure (Virmani et al, 1997). The results showed that 367R contains one restorer gene and 396R possesses two restorer genes within their genomes. The genotypic analysis showed that there are two major QTLs, in chromosome (“chr” hereafter) 10, which is co-localized with two previously reported QTLs where Rf4 and Rf5 genes were mapped. For the second part of this study, the parental lines were evaluated for grain length, width, thickness, 100-seed weight, and heading date. The population 367R × RU1501139 (“Population-A”, hereafter) was selected for evaluation of grain length, thickness, and length/width ratio. A total of 300 F3 seeds from F2 plants grown in greenhouse conditions were harvested, cleaned and evaluated using the WinSEEDLE TM image analyzer (Regent Instruments Inc., Canada). A total of 17 QTLs for grain dimensions were identified. Two QTLs in chr. 3 and one each QTL in chr. 7 and 11 were associated with grain length, while two QTLs located in chrs. 3 and 7 were associated with grain length/width ratio. Three QTLs located in chrs. 5, 6, and 8 were associated with grain thickness, while nine grain weight QTLs were identified that included four QTLs in chr. 12, two QTLs in chrs. 1 and 10, and one QTL in chr. 3. These results can be used for developing superior restorer lines and applied to hybrid rice production via marker-assisted selection.
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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 | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 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 ».