Effect of potato seed treatment by barley-shochu post-distillation slurry on the bacterial community structures and the abundance of antagonistic bacteria against Streptomyces scabiei on the periderm of seed tubers
2020
Takegoshi, M. ((Kagoshima University, Kagoshima (Japan). The United Graduate School of Agricultural Sciences), (Tsukuba Research Institute, Katakura & Co-op Agri Corporation, Tsukuba, Ibaraki (Japan))) | Ikenaga, M. | Tomihama, T. | Noguchi, K. | Sakai, M.
Potato common scab is an important disease caused by soil- and seed-borne pathogenic Streptomyces species. The seed treatment by post-distillation slurry of barley-shochu gives the trend to reduce the population density of the pathogen in the infected seed tubers and suppress seed-borne common scab. However, the detailed mechanism has not been elucidated. The post-distillation slurry is a liquid fertilizer containing high varieties of organic components, so it can be available nutrients for microorganism in the seed tubers. In this study, we examined the effect of the seed treatment by the post-distillation slurry on the bacterial community structures in the periderm of seed tubers and the stolons infected by pathogenic Streptomyces spp., with amplicon sequencing analysis of 16S ribosomal RNA genes. The post-distillation slurry treatment altered the bacterial composition and led to the largest increase in the relative abundance of Bacillus genus in both seed tubers and stolons. The most abundant species belonging to Bacillus in seed tubers was closely related to Bacillus aryabhattai, which showed antagonistic ability against pathogenic Streptomyces scabiei isolated from the periderm of seed tubers. The results suggested that the seed treatment by the post-distillation slurry induced to increase the indigenous antagonistic B. aryabhattai on seed tuber. Subsequently the species assumed to contribute the suppressing seed-borne common scab by spreading to the stolons.
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