Assessment of Antifungal Potentials of Ethanol Extract of <i>Cleistocalyx operculatus</i> Roxb Against <i>Cercospora nicotianae</i> for Pesticidal Applicability: <i>In Vitro</i> and <i>In Silico</i> Screening
DOI:
https://doi.org/10.26538/tjnpr/v8i8.3Keywords:
Antifungal activity, In silico, In vitro, Cercospora nicotianae, Cleistocalyx operculatusAbstract
Cleistocalyx operculatus is ubiquitous and known by folk experiences for its antimicrobial properties, thus promising as a low-cost green pesticide. In this work, the plant ethanol extract was investigated against Cercospora nicotianae, a pathogenic fungus implicated in the leaf spot in Pennywort. Characterisation of the plant extract showed 21 identifiable constituents (1-21), with the major components: 4’,5'-dimethoxy-2'-hydroxy-4-methylchalcone (21; 41.71 %), phytol (15; 8.46 %), and 5.7-dimethoxyflavanone (20; 5.20 %). The in vitro antifungal screening of the extract revealed potent inhibitory capacity up to 7 days after inoculation (concentration = 9.54mg.mL-1 ). The inhibitory potential was predicted by docking simulation, i.e., 19-Q6DQW3 (DS ̅̅̅̅ - 10.7 kcal.mol-1 ; DSmax -12.7 kcal.mol-1 ) > 21-Q6DQW3 (DS ̅̅̅̅ -10.3 kcal.mol-1 ; DSmax -11.9 kcal.mol-1 ) > 20-Q6DQW3 (DS ̅̅̅̅ -10.3 kcal.mol-1 ; DSmax -11.7 kcal.mol-1). The chemical potentiality was derived from quantum calculation, i.e., 22 (-1172.77 a.u.) > 21 ≈ 19 (approx. - 1000 a.u.) > 20 (-ca. -950 a.u.) for chemical stability, and 3 (3.40 Debye), 15 (2.47 Debye), and 5 (2.03 Debye) for physical compatibility. The suitability for biological and pesticidal applications was justified by physicochemical analyses. The results revealed a firm correlation between the extracted major constituents (20 and 21) and the total antifungal activity against C. nicotianae, thus encouraging its local usage.
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