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La division cellulaire est un processus biologique fondamental régi par des réseaux moléculaires initiés dans les méristèmes apicaux des plantes. L'acide ascorbique (AsA), communément appelé vitamine C, est un modulateur moléculaire crucial impliqué dans la prolifération cellulaire. Dans cette étude, nous avons utilisé l'application de l'AsA à Arabidopsis et quatre mutants de la voie de l'AsA pour étudier l'influence de l'AsA sur le méristème racine apical (RAM) et la croissance des racines. Le traitement des semences de Col-0 de type sauvage avec de l'AsA avant le semis a montré une augmentation significative de l'activité de division cellulaire de la RAM, du taux de croissance des racines et de la longueur des racines par rapport aux semences non traitées. Les semis du mutant de la voie AsA, vtc1-1, ont montré une réduction significative du niveau d'AsA et une augmentation significative du nombre de cellules inactives dans la RAM par rapport au Col-0. La prolifération cellulaire était réduite dans les mutants de la voie AsA vtc1-1, dhar1, vtc5-1, apx1, respectivement. Cependant, la croissance des racines ne diminuait significativement que dans vtc1-1 par rapport à Col-0. De plus, il a été démontré que les niveaux de peroxyde d'hydrogène (H2O2) augmentaient dans les mutants de la voie AsA, le niveau le plus élevé d'H2O2 étant observé dans vtc1-1. Il a également été démontré que AsA avait une influence indirecte sur l’induction de la division périclinale puisqu’un niveau réduit avait été trouvé dans vtc1-1. Par conséquent, dans cette étude, nous avons constaté que l’AsA avait une influence sur la prolifération cellulaire et la croissance des racines et il a été démontré que VTC1 était un modulateur clé des taux de H2O2. Ces découvertes ouvrent la porte à de nouvelles études pour révéler l'implication de l'AsA dans la prolifération cellulaire et l'interaction entre l'AsA et H2O2 sur la polarité cellulaire dans la RAM et potentiellement dans le méristème apical de la pousse.
Source: https://www.ncbi.nlm.nih.gov/pubmed/29929127