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Antifungal activity of slightly acidic hypochlorous water on a rice pathogenic fungus Fusarium fujikuroi

Rice is a major crop that widely cultivated in southern area of Korea. However, a significant decrease in grain yield and economic loss by rice bakanae disease have been recently reporte...

Antifungal activity of slightly acidic hypochlorous water on a rice pathogenic fungus Fusarium fujikuroi

Rice is a major crop that widely cultivated in southern area of Korea. However, a significant decrease in grain yield and economic loss by rice bakanae disease have been recently reported. Rice bakanae is mainly seed borne caused by the infection of rice pathogenic fungus Fusarium fujikuroi. Typical symptom of rice bakanae is abnormal elongation of rice seedlings induced by fungal production of gibberellin hormone. In this study, we aimed to evaluate the antimicrobial activity of slightly acidic hypochlorous water(SAHW) upon F. fujikuroi and to develop the eco-friendly strategy for controling bakanae disease since it is known that SAHW has potent antimicrobial activity upon pathogenic bacteria and fungi but not harmful to human and animal cell. Treatment with 0.25 ppm SAHW resulted in completely inhibition of spore germination and hyphal growth of F. fujikuroi. Moreover, the number of viable cells was rapidly reduced by at least 99.9% within 5 min. By treatment with 0.5 ppm SAHW for 1 hr, the rice seeds were completely disinfected from microbial contamination during seed germination in tissue culture media. The growth of F. fujikuroi from the infected seeds was not observed after treatment with 0.5 ppm SAHW. These results indicated that SAHW is an effective disinfectant to control the rice bakanae disease caused by F. fujikuroi infection.

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