This study was aimed to evaluate the in vitro antifungal activity of the essential oil and its compositions of Polygonum odoratum Lour. against rice pathogenic fungi. The oil displayed potential antifungal activities in vitro as percentage of mycelia inhibition (and spore germination) against Rhizoctonia solani and Bipolaris oryzae as 77% (75%) and 60% (92%) inhibition with IC50 0.066 and >2.5 mg/mL, respectively. Chemical analysis of the essential oil by GC/MS allotted identification of dodecanal (54%), decanal (15%), trans-caryophyllene (8%), cyclododecane (7%), and a-humerene (5%) as main compounds. Especially, dodecanal most strongly and least inhibited the growth of R. solani and B. oryzae, with IC50 0.851 and >3.0 mg/mL, respectively. This essential oil and its major compositions could be used as further fungicidal agents against other plant diseases.

Potent compositions from the essential oil of <i>Polygonum odoratum</i> Lour. against pathogenic rice fungi

248th National Meeting (2014)

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Potent compositions from the essential oil of Polygonum odoratum Lour. against pathogenic rice fungi