Confirmation of the pathogenicity of Aphanomyces cochlioides originating from a hydroponic system in soil-cultivated quinoa and sugar beet seedlings

Abstract

The potential pathogenic risk of Aphanomyces cochlioides originating from hydroponically grown quinoa on soil-cultivated plants was evaluated. A. cochlioides is widely recognized as one of the causal agents of sugar beets under soil conditions. However, the pathogenicity of the A. cochlioides strain isolated from quinoa in hydroponic conditions on soil-cultivated plants has not been studied. Therefore, the pathogenicity of A. cochlioides on quinoa and sugar beets under soil conditions was confirmed through pot inoculation tests. The results of the inoculation tests demonstrated that the A. cochlioides strain originating from hydroponically grown quinoa can cause severe damping-off of quinoa and sugar beets under soil conditions. The present study confirmed that hydroponic-origin A. cochlioides can act not only under hydroponic conditions but also soil conditions.