Indiscriminate use of antibiotics often results in the development of resistant microbial strains. The
unprecedented increase in cases of antimicrobial drug resistance, the discovery of newer agents, particularly
from natural plant metabolites, are required for the control of such prevalent and recurring infectious diseases
worldwide. This study aimed to evaluate antibacterial and antifungal activities of extracts from different parts
of Tagetes patula, Tagetes erecta, and Tagetes minuta, which are important medicinal plants. Five grams of airdried flower, leaf, and bud (only for T. patula and T. erecta) samples were extracted three times with methanol:
water (4:1) at room temperature in the dark for 24 h. The methanol: water extracts were combined, filtered,
and concentrated to dryness using a rotary evaporator at 40 °C. The extracts were screened for their in vitro
antimicrobial activities against nine indicator strains [three Gram-positive bacteria (Staphylococcus aureus,
Bacillus subtilis, and Enterococcus faecalis), three Gram-negative bacteria (Escherichia coli, Klebsiella
pneumoniae, and Pseudomonas aeruginosa) and three fungi (Candida albicans, Aspergillus niger, and
Phytophthora erythroseptica)] by Agar well diffusion assay. Broth microdilution method was used to determine
minimum inhibition concentrations (MIC) of the extracts that showed antimicrobial activity against Grampositive bacteria and P. erythroseptica. The T. patula leaf extracts led to the highest antibacterial activity
against B. subtilis ATCC 6633 with an inhibition zone of 17 mm and a MIC value of 256 µg/ml. The bud and
flower extracts of T. patula were potent against the same strain at an intermediary level. Also, the T. erecta bud
extracts inhibited the growth of E. faecalis ATCC 29212 at a moderate level. In this study, only the T. patula
flower extracts showed antifungal activity against P. erythroseptica strain with a MIC value of 426.7 µg/ml.
Our findings make an excellent contribution to revealing the antimicrobial activity of T. erecta, T. patula and
T. minuta by comparing the methanol-extracted leaf, bud, and flower parts at a single experimental setup.
Primary Language | English |
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Journal Section | Articles |
Authors | |
Publication Date | June 29, 2021 |
Published in Issue | Year 2021 |
Turkish Journal of Field Crops is published by the Society of Field Crops Science and issued twice a year.
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Ege University, Faculty of Agriculture,Department of Field Crops
Editor in Chief : Prof. Dr. Emre ILKER
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