Timing of stress and yield determination in maize (Zea Mays L.)
Notice bibliographique
Résumé
Yield loss in maize (Zea mays L.) is well known to be caused by abiotic and biotic stresses. Previous studies have focused, primarily, on the determination of yield loss as a result of stress occurring during the critical reproductive stages, that is, around silking and the grain fill period. No studies have assessed yield loss caused by differing stresses that occur early during the vegetative phase. Studies were conducted during 2012-13 under controlled and field conditions at two locations in Ontario, Canada. Early season stresses (i.e., up to V9 stage of growth) included drought, light quality (red to far red) and early high-plant density while high plant density was considered a season long stress. In this thesis, the hypothesis was tested that if yield is reduced in response to early season stress, then, resource capture and resource utilization will be reduced proportionally. The relationship between plant dry matter and floret number follows the classic relationship with a minimum dry matter level required and a plateau. Not all stresses impacted these relationships in the same manner. These results confirm that floret number in maize is established well in advance of flowering and also suggests that floret number is related to plant dry weight sampled between V7 to V9-10 stage of growth. Yield loss in the drought and early high-plant density stress treatments, was caused by reductions in dry matter accumulation and kernel number. Growth rates around silking were reduced and flowering delayed in response to early season stress which explained reductions in kernel set. While ASI was only lengthened by early high density, HI remained unchanged in response to early season stress. Season-long high plant density stress resulted in reduced plant dry matter, and kernel number. Plants presenting low dry matter accumulation in each stage of growth exhibited lower floret and kernel number. Barren plants at maturity showed very low or no dry matter accumulation during the grain filling period. Overall, early season stress reduced resource capture only, while season long stress defined as high plant density reduced both resource capture and utilization.
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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 | 0,000 | 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 | 0,000 | 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 ».