Browsing by Author "MAALEM NOUR EL HOUDA"

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    Floristic biodiversity and valorization of bioresources in Belezma National Park (wilaya of Batna)
    (University of M'Sila, 2024) MAALEM NOUR EL HOUDA
    This study focused on the evaluation of the floristic biodiversity of the Belezma National Park, the chemical characterization of Thymus algeriensis and Santolina rosmarinifolia and the study of the biological activities of their essential oils and their methanolic extract. In total, 18 stations were sampled over a two-year period (2022-2023) using a systematic sampling method, in order to identify the plant species that make up the floristic procession of the Park. The results of the floristic study of the Park demonstrate a floristic diversity, 288 species belonging to 47 different botanical families and encompassing 194 genus. Among the 288 species inventoried, we have made a rediscovery of a species of great importance at the level of Algeria in general and the Park in particular: the rediscovery of Tulipa sylvestris subsp. primulina (Baker) Maire & Weiller. It is a rare and endemic Algerian-Moroccan species. In terms of species representation, the Asteraceae, Fabaceae, and Apiaceae families are the most represented, with 20.27%, 10.83%, and 8.04%, respectively. Hemicryptophytes account for 37.5% of the study region's vegetation. In terms of biogeographic origin, the majority of these species (51 %) are of Mediterranean origin. The essential oils of T. algeriensis Boiss. & Reut. and S. rosmarinifolia L. obtained by hydrodistillation were analyzed by GC-MS. The chemical analysis showed that the essential oil of Thymus algeriensis contains 89 chemical components including (+)-2-bornanone (12.54%), eucalyptol (8.65%), (1R)-2,6,6 trimethyldicyclo[3.1.1]hept-2-Eni (8.48%), acetate alpha-terpineyl (6.58%) and linalool (6.23%) are the main constituents of essential oil. The essential oil of S. rosmarinifolia consists of 96 compounds, the main components of which are Bicyclo[3.1.1]heptane, 6,6-dimethyl-2-methylene (18.39%), Eucalyptol (15.78%), 2(10)- Pinene (10.67%), (-)-Germacrene D (5.88%). The essential oils and the methanolic extracts tested showed significant antibacterial activity against Escherichia coli, and Staphylococcus aureus, and weak antibacterial activity against Pseudomonas aeruginosa. These oils and these extracts have a significant antioxidant capacity; as measured by the DPPH test.