Abstract
The soil-borne pathogens Rhizoctonia solani and Sclerotium rolfsii have emerged as major pathogens of radish (Raphanus sativus) worldwide. The induction of soil suppressive of radish root rot disease was evaluated in soil repeatedly inoculated with R. solani, nonpathogenic binucleate Rhizoctonia sp. AG-A W1 (BNR) and S. rolfsii. The repeated inoculations of soil with R. solani and BNR significantly suppressed the disease severity of R. solani and S. rolfsii compared to the control. In contrast, the repeated inoculation of soil with S. rolfsii significantly suppressed only the pathogen, S. rolfsii. The community structure was examined using PCR-DGGE (polymerase chain reaction denaturing gradient gel electrophoresis) method. The bands of Trichoderma sp. were observed in the first, second and third inoculations of the soil with BNR. Similarly, bands of Trichoderma sp. were observed in the second and third inoculations of the soil with S. rolfsii and R. solani. Compared to the control, disease severity was significantly reduced in the soil repeatedly inoculated with S. rolfsii and R. solani . In conclusion, Trichoderma species were accumulated in specific patterns depending on the applied fungal inoculum in the suppressive soil.
Highlights
Crops are seriously affected by soil-borne plant pathogens
Disease severity values were significantly reduced in soil that was repeatedly inoculated with R. solani and S. rolfsii
Disease severity values in soil repeatedly inoculated with S. rolfsii were
Summary
Crops are seriously affected by soil-borne plant pathogens. Root rot is a common disease found in the soil of high-humidity locations. Rhizoctonia solani and Sclerotium rolfsii are the most dangerous pathogens for radish root rot disease. R. solani, a phytopathogenic fungus, is categorized into anastomosis groups (AGs) based on their hyphal anastomosis reactions [1]. Brown blotches, damping off in seedlings and root rot are a few of the economically important plant diseases caused by the fungus. R. solani strains vary in their host specificity and virulence levels toward their plant hosts. The pathogen S. rolfsii infects around 500 plant species and causes significant losses in global crop production. S. rolfsii is found all over the globe; it is most common in tropical and subtropical environments [2]
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