Abstract
Thymol, the key component of the thyme oil and its derivatives were evaluated for their structure activity relationship as fungicide against Rhizoctonia solani. Since plant-based chemicals are considered as “Generally Recognized as Safe” (GRAS) chemicals, there is great potential to use those and synthetic derivatives against R. solani and other fungal pathogens, in vitro, and in the greenhouse or field conditions. Among the six thymol derivatives evaluated, thymol acetate was considered as the most suitable commercially viable plant-based fungicide due to its superior efficacy as well as lowest residue.
Highlights
Agricultural plants are susceptible to several economically important soilborne fungal diseases
The present study investigated the antifungal effectiveness of thymol and its six synthetic derivatives against the common soilborne plant pathogenic fungus R. solani with respect to in vitro growth inhibition and biocontrol efficiencies in the greenhouse to suppress cucumber seedling damping off caused by the pathogen
A highly virulent and damping-off causing soilborne fungus R. solani anastomosis group (AG) 4, isolate Rs 23A [6] was used for antifungal bioassay thymol derivatives
Summary
Agricultural plants are susceptible to several economically important soilborne fungal diseases. Soilborne fungal pathogens, including R. solani have been traditionally controlled using chemicals, some of which deplete natural resources, inconsistent in efficacy and toxic to the environment. Plants are inexhaustible reservoirs of secondary metabolites, some of which are antimicrobial in nature and are believed to function as a natural defense mechanism against pests and pathogens Several of these chemicals are less phytotoxic and biodegradable. The present study investigated the antifungal effectiveness of thymol and its six synthetic derivatives against the common soilborne plant pathogenic fungus R. solani with respect to in vitro growth inhibition and biocontrol efficiencies in the greenhouse to suppress cucumber seedling damping off caused by the pathogen. (SAR) of thymol derivatives is important for development of more effective antifungal formulations for the control of soilborne plant pathogens
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