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- W3164051011 abstract "Abstract Streptomyces species are the causal agents of several scab diseases on potato tubers. A new type of scab symptom, caused by Streptomyces species, was observed in South Africa from 2010 onwards. The disease was initially thought to be caused by a single Streptomyces species, however, subsequent isolations from similar symptoms on other potato tubers revealed diversity of the Streptomyces isolates. The objective of this study was to characterise these isolates in order to determine which species are involved in the disease. This was done by sequencing and phylogenetic analyses of the 16S rDNA as well as five housekeeping genes, investigation of growth on different culture media, standard phenotypic tests and scanning electron microscopy of culture morphology. The presence of the pathogenicity island (PAI) present in plant pathogenic Streptomyces species was also investigated. The genomes of eight isolates selected from the three main clades identified, were sequenced and annotated to further clarify species boundaries. Two isolates of each of the three main clades were also inoculated onto susceptible potato cultivars in order to establish the pathogenicity of the species. The results of the phylogenetic and genome analyses revealed that there are three main species involved, namely, S. werraensis , S. pseudogriseolus and a novel Streptomyces species that is described here as Streptomyces resiliuntiscabiei sp. nov. The glasshouse trial results showed that all three of the Streptomyces species are capable of producing fissure scab symptoms. None of the Streptomyces isolates from fissure scab contained the full PAI and the mechanism of disease initiation still needs to be determined." @default.
- W3164051011 created "2021-06-07" @default.
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- W3164051011 date "2021-05-24" @default.
- W3164051011 modified "2023-09-27" @default.
- W3164051011 title "Streptomyces Species Associated with Fissure Scab of Potato in South Africa Including Description of S. Resiliuntiscabiei Sp. Nov." @default.
- W3164051011 doi "https://doi.org/10.21203/rs.3.rs-326303/v1" @default.
- W3164051011 hasPublicationYear "2021" @default.
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