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Le thé est une boisson non alcoolisée importante dans le monde entier. La qualité du thé est déterminée par de nombreux métabolites secondaires présents dans les feuilles de thé récoltées, notamment les polyphénols de thé, la théanine, la caféine et l'acide ascorbique (AsA). Le métabolisme de l'AsA dans les feuilles de thé récoltées est affecté par la température de stockage et de transport. Cependant, les mécanismes moléculaires sous-jacents au métabolisme de l'AsA dans les feuilles de thé récoltées exposées à différentes conditions de température de stockage et de transport restent flous. Nous avons effectué ici une RP-HPLC pour détecter les changements dynamiques de la teneur en AsA dans les feuilles de thé soumises à des traitements à température élevée (38 ° C), basse (4 ° C) ou à la température ambiante (25 ° C). La distribution et les niveaux d'AsA dans les feuilles de thé traitées ont été analysés à l'aide de méthodes de caractérisation cytologique-anatomique. Les protéines CsAPX1 et CsDHAR2 exprimées de manière différentielle, qui sont impliquées dans la voie de recyclage de l'AsA, ont été identifiées à partir des données protéomiques correspondantes à l'aide de iTRAQ. Nous avons également analysé les profils d'expression de 18 gènes impliqués dans le métabolisme de l'AsA, notamment CsAPX1 et CsDHAR2. AsA était principalement distribué dans des cellules de mésophylle de feuilles de thé. Les traitements à haute et basse température ont régulé positivement les protéines CsAPX1 et CsDHAR2 et induit l'expression des gènes CsAPX et CsDHAR2. Ces résultats indiquent que les protéines CsAPX1 et CsDHAR2 pourraient jouer un rôle essentiel dans le recyclage de l’AsA dans les feuilles de thé. Nos résultats fournissent une base pour une étude approfondie du métabolisme de l'AsA dans les feuilles de thé pendant le stockage et le transport, et ils favoriseront une meilleure saveur du thé dans la production de thé.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30302261