Accumulation of phenolic compounds in plants and nutrient solution of hydroponically grown peppers inoculated with<i>Pythium aphanidermatum</i>
Notice bibliographique
Résumé
Abstract Root browning is a principal symptom of pythium root rot of pepper (Capsicum annuum) caused by Pythium aphanidermatum, but its biochemistry and physiological importance are poorly understood. Phenolic compounds were quantified over time in hydroponically grown pepper plants that were inoculated with zoospores of P. aphanidermatum or not inoculated (controls). The data were examined in relation to biotrophic colonization of the roots by the pathogen (roots remained white), necrotrophic colonization (roots turned brown), and plant growth. Colonization remained biotrophic in a temperature regime of 22:19 °C (temperature reduced at 2 days after inoculation) but became necrotrophic when the temperature was raised from 22 °C to 28 °C and when plants were kept continuously at 28 °C. Concentrations of free and cell-wall-bound phenolics, respectively, increased two- to three-fold and up to six-fold in inoculated roots compared with noninoculated roots maintained at 28 °C, and after the temperature was raised in the 22:28 °C regime; no differences were found in the 22:19 °C regime. Phenolic accumulation in inoculated roots coincided with, and paralleled, root browning. Pearson correlations of free and bound phenolics in relation to browning of the roots were moderate to high (r p = 0.40–0.90) and high (r p = 0.80–0.93), respectively. Observations of roots stained with p-nitroaniline indicated that phenolic compounds accumulated mainly in the brown as opposed to white roots. Increases in free and bound phenolics in the shoots coincided with phenolic accumulation and browning in the roots, but the leaves remained green. Phenolic compounds accumulated in nutrient solutions of all treatments, but levels were higher for inoculated plants with brown roots compared with those with only white roots and compared with the controls. Pythium aphanidermatum did not significantly affect dry mass of roots and shoots under conditions conducive to biotrophy (22:19 °C), but growth ceased and dry mass often declined when inoculated roots turned brown (28 °C). It is concluded that marked increases in concentrations of phenolics in roots, shoots, and nutrient solutions, and abrupt cessation of growth in hydroponically grown pepper plants inoculated with P. aphanidermatum were associated with the development of root browning.
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 | 0,000 | 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 ».