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. Pour-la-première-fois, Catharanthus roseus and Vernonia amygdalina (Del.) a été réalisée Un total de 23 souches de champignons endophytes ont été isolées à partir des plantes après la stérilisation de surface puis les différentes analyses biologiques ont été effectuées. Les extraits bruts d'acétate d'éthyle de 21 endophytes ainsi que de leurs plantes hôtes ont été évalués pour leur teneur en phénols totaux et leur activité antioxydante en utilisant respectivement la méthode colorimértrique Folin-Ciocalteu et le piégeage des radicaux libres par la méthode 1,1,-diphényl-2-picrylhydrazil (DPPH) in vitro Une évaluation générale de la cytotoxicité de 16 endophytes sélectionnés ainsi que de leurs plantes hôtes a été réalisée selon le test MTT sur trois types de cellules cancéreuses : carcinome du sein humain (MCF7), adénocarcinome du côlon (HT29 et HCT116) Ces extraits ont été aussi testés, selon la méthode de dilution en bouillon, sur deux souches bactériennes représentatives, Escherichia coli et la souche résistante à la méthicilline de Staphylococcus aureus. La teneur en phénols totaux (89,9 ±7,1 mg Equivalent d'Acide Gallique EAG/g) ainsi que l'activité antioxydante (IC 50 : 18±0,1 µg/mL) les plus élevées ont été observées pour l'endophyte, Aspergillus terreus 2 isolé à partir des graines de T. foenum-graecum. Byssochlamys spectabilis a montré l'activité cytotoxique la plus importante (1,51 ± 0,2 µg/mL), suivi par Cladosporium cladosporioides 2 (10,5 ± 1,5 µg/mL), puis par Alternaria sp Seules six souches ont montré une activité contre S. aureus avec des valeurs de MIC qui se situent entre 0,125 et 2 mg/mL dont: Alternaria alternata (0,125 mg/mL), Alternaria sp 10 composés purs (0,3 à 40 mg) ont été isolés à partir des extraits bruts d'acétate d'éthyle de Curvularia papendorfii, Euphorbia prostrata Byssochlamys spectabilis µM et une très faible activité antibactérienne contre S. aureus. Ces deux composés ne présentent pas d'activité antioxydante, pp.15-18