الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Avocado (Persea americana Mill., F. Lauraceae) is an evergreen tree, native to Central America and cultivated in both tropical and Mediterranean regions including Egypt. The nutritional and medicinal uses of avocado have been confirmed through numerous studies. In this respect, seven avocado cultivars grown in Egypt (one pure Mexican and six Mexican-Guatemalan hybrids) were investigated in view to provide genetic, botanical, phytochemical and biological criteria for inter-cultivar discrimination. The Duke (pure Mexican cultivar) was the most genetically distant as demonstrated by DNA fingerprinting while high similarities were observed between the remaining cultivars. Different botanical and phytochemical features were detected among leaves and fruits of the investigated samples offering suitable criteria for inter-cultivar differentiation. The investigation of the composition and antimicrobial activity of the essential oils of four of the cultivars (selected based on highest essential oil yield) revealed variability in both composition and bioactivity. A total of 20 constituents were identified with estragole, methyl eugenol and Ý-pinene as major. Chemometric analysis performed on the GC/FID and GC/MS data indicated close similarity between the essential oils of Bacon and Ettinger cultivars, while that of the Duke was the most distant. This classification was further supported by comparative DNA fingerprinting using RAPD technique. Essential oils of all cultivars showed good antimicrobial activities against Streptococcus mutans and Salmonella typhimurium (IC50 values, 0.4-20 oL/mL)