Potato-Infecting Ralstonia solanacearum Strains in Iran Expand Knowledge on the Global Diversity of Brown Rot Ecotype of the Pathogen

Nasim Sedighian, S. Mohsen Taghavi, Habiballah Hamzehzarghani, J.M. van der Wolf, Emmanuel Wicker, Ebrahim Osdaghi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Bacterial wilt and brown rot disease caused by Ralstonia solanacearum species complex (RSSC) is one of the major constraints of potato (Solanum tuberosum) production around the globe. During 2017-2018 an extensive field survey was conducted in six potato-growing provinces of Iran to monitor the status of bacterial wilt disease. Pathogenicity and host range assays using 59 bacterial strains isolated in Iran showed that they were pathogenic on eggplant, red nightshade, pepper, potato and tomato, while nonpathogenic on common bean, cowpea, cucumber, sunflower, zinnia and zucchini. PCR-based diagnosis revealed that the strains belong to the phylotype IIB/sequevar 1 (IIB/I) lineage of the RSSC. Furthermore, a five-gene multilocus sequence analysis and typing (i.e. egl, fliC, gyrB, mutS, rplB) confirmed the phylogenetically near-homogeneous nature of the strains within IIB/I lineage. Four sequence types were identified among 58 IIB/1 strains isolated in Iran. Phylogenetically near-homogeneous nature of the strains in Iran raise questions about the mode of inoculum entry of the bacterial wilt pathogen into the country (one-time introduction vs. multiple introductions), while the geographic origin of the Iranian R. solanacearum strains remains undetermined. Furthermore, sequence typing showed that there were shared alleles (haplotypes) and sequence types among the strains isolated in geographically distant areas in Iran, suggesting intra-national transmission of the pathogen in the country.
Original languageEnglish
Pages (from-to)1647-1656
JournalPhytopathology
Volume110
Issue number10
DOIs
Publication statusPublished - 13 May 2020

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