ISSN 2169-303X
International Journal of Medicinal Plants Research ISSN 2169-303X Vol. 9 (8), pp. 001-007, August, 2020. © International Scholars Journals
Full Length Research Paper
Correlation between chemical composition and antifungal properties of essential oils of Callistemon rigidus and Callistemon citrinus of Cameroon against Phaeoramularia angolensis
Pierre MD Jazet1,2, Léopold N Tatsadjieu3*, Bernadin D Ndongson1, Jean Kuate4 , Paul H Amvam Zollo1and Chantal Menut5
1ENSAI, University of Ngaoundéré, Ngaoundéré, Cameroon.
2Faculty of Science, University of Douala, Douala, Cameroon.
3IUT, University of Ngaoundéré, Ngaoundéré, Cameroon.
4Institute of Agricultural Research for Development (IRAD), Yaoundé, Cameroon.
5UMR 5032 – ENSCM 8, Rue de l’ école normale, 34296 Montpellier Cedex 5.
Accepted 16 April, 2020
Abstract
Leaf essential oils of Callistemon rigidus and Callistemon citrinus obtained by steam-distillation were assigned for their antifungal activity against Phaeoramularia angolensis. The oils of C. rigidus and C. citrinus were dominated by the presence of 1,8-cineole (79.1% and 73.8% respectively). Fractions 6 and 5 isolated from C. rigidus and C. citrinus respectively were rich in1,8-cineole (100% and 91.4% respectively). The determination of the antifungal activity of the essential oils was done by the agar medium assay. Total inhibition was obtained with the concentrations of 6500 ppm and 6000 ppm for C. rigidus and C. citrinus essential oils respectively. Fraction 12 of C. citrinus rich in -terpineol and terpinen-4-ol (88.7% and 10% respectively) was the most active showing total inhibition against Phaeoramularia angolensis at 1500 ppm. The two essential oils used showed fungicidal properties against P. angolensis and could constitute an alternative to synthetic fungicides usually used for citrus fruit crops.
Key words: Essential oil, Callistemon citrinus, Callistemon rigidus, essential oil composition, Phaeoramularia angolensis, antifungal activity.