Molecular and metabolic investigation into the fungal-fungal interaction between the soilborne plant pathogen «Rhizoctania solani» and the mycoparasite «Stachybotrys elegans»
Notice bibliographique
Résumé
Mycoparasitism, the direct attack of one fungus on another, is a complex process that involves sequential events, including recognition, attack and subsequent penetration and killing of the host. The cellular interaction between Stachybotrys elegans a mycoparasite of the soilborne plant pathogen Rhizoctonia solani begins with molecular and chemical interactions that lead to expression of several genes or components of signaling pathways, and secretion of many metabolite biomarkers. Transcriptional changes of several mycoparasitism-induced genes (oxidoreductase, cytochrome P450 monooxygenase, carboxylesterase, and O-methyltransferase) during an extended period of interaction were associated with the formation of excessive coils and infection pegs which are required for limiting the growth of the pathogen. Hyphae and sclerotia of R. solani triggered different expression patterns of these genes, which is a clear indication that multiple regulatory mechanisms might be involved during the mycoparasitic process. In response to attack, hyphal and sclerotial cells of R. solani had elevated expression of pyridoxal reductase, a precursor of vitamin B6 or its derivatives which are known as antioxidants and quenchers of reactive oxygen species. The high elevated expression of some genes belonging to the mycoparasite and the host suggests that these genes play an important role during the mycoparasitic process and host defense, respectively. As a first step toward understanding the molecular basis of signal transduction during the cross talk between S. elegans and R. solani, the cloning and complete characterization of smkA, the first MAP kinase (MAPK/ERK1/2) gene from S. elegans was accomplished. At the transcriptional level, smkA was significantly induced in response to hyphal parasitism compared to parasitized sclerotia. However, under starvation condition, smkA levels were significantly induced at a later stage of growth. Western blot analysis against ERK1/2 showed an increase in their phosphorylated forms when S. elegans was grown under starvation condition compared to that detected in response to mycoparasitism. A higher abundance of phosphorylated ERK1/2 at the third day of interaction compared to that estimated under starvation condition was detected by applying LC–MS/MS. Direct Infusion Orbitrap MS (DI-MS) and robust bioinformatics tools highlighted a total of 486 metabolites as biomarkers in parasitized cells of R. solani, and in cells from monocultures of R. solani. Carboxylic acids and alkaloids were the predominant chemical groups in parasitized cells compared to those in R. solani monocultures indicating their role in the mycoparasitism. The increase in relative intensity of R. solani-derived indole biomarker, 11-hydroxycanthin-6-one, is indicative of a defense reaction against S. elegans. This study provides new knowledge that can be exploited for plant disease management strategies and for research dealing with biotechnology such as genetic engineering and/or biomarker-assisted plant breeding.
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 | 0,000 | 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) | 0,001 | 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 ».