Abstract
Ralstonia solanacearum is the causal agent of Moko disease in bananas, which in the state of Sergipe in northeastern Brazil causes “Sergipe facies”. This disease induces atypical symptoms similar to those of Bugtok disease in the Philippines. This study was conducted to sequence, assemble, and annotate the genomes of the Sergipe facies-causing isolates SFC and IBSBF2570 (sequevar IIA-53) and compare their genomes with two representative isolates causing Bugtok disease. The genomes were sequenced and assembled, resulting in lengths of 5.58 Mb (SFC) and 5.46 Mb (IBSBF2570) in 185 and 174 contigs, respectively. The isolates of Sergipe facies and Bugtok disease showed similarities in their gene contents. We identified 5,668 information clusters, 3,752 of which were shared by all genomes (core genes). Moreover, 3,585 single-copy genes were identified. Isolates causing Bugtok disease exclusively shared 266 more information clusters than the isolates causing Sergipe facies. These results suggest that Sergipe facies and Bugtok disease isolates show high genomic similarity. However, the similarity is even greater between the Bugtok disease isolates. This may be because of their longer period of interaction compared to Sergipe facies isolates.
Highlights
Ralstonia solanacearum is the causal agent of Moko disease in triploid bananas and Heliconia species (Hayward, 1994)
The isolates causing Moko in bananas were classified as R. solanacearum belonging to phylotype II and subdivided into IIA and IIB (Fegan and Prior, 2006), originating in the Americas (Prior and Fegan, 2005), and sequevars IIA-6, IIA-24, IIA-41, IIA-53, IIB-3, IIB-4, and IIB-25 (Fegan and Prior, 2005; 2006; Albuquerque et al, 2014)
In the state of Sergipe in northeastern Brazil, there is a variant of Moko disease known as “Sergipe facies”
Summary
Ralstonia solanacearum is the causal agent of Moko disease in triploid bananas and Heliconia species (Hayward, 1994). This disease is caused by endemic isolates of R. solanacearum within sequevar IIA-53, which initiate symptoms in the inflorescences and progress to dry rot and fruit deformation without wilting.
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