Phylotypes of the potato bacterial wilt pathogen in the Philippines and their relationship to pathogen aggressiveness

Abstract

© 2018, Società Italiana di Patologia Vegetale (S.I.Pa.V.). Three hundred seventy-two Ralstonia solanacearum isolates were collected from potato fields, in the Philippines, and characterized based on phylotypes, distribution and aggressiveness to host plants. Two major genetic group were identified: Phylotype I (Asiaticum), which were predominant in the southern region (Bukidnon), and Phylotype II (Americanum), found mainly in the northern region (Benguet). Phylotypes I and II were both pathogenic to tomato and potato host plants, but Phylotype I induced significantly earlier wilting symptoms to tomato and potato than Phylotype II (P = 0.03 – <0.01). No correlation was found between elevation and phylotype distribution (coefficient = 0.03–0.22). Based on the current taxonomic classification of R. solanacearum species complex, R. pseudosolanacearum and R. solanacearum cause potato bacterial wilt in the Philippines. Implications for quarantine regulations and breeding programs are discussed.

Source or Periodical Title

Journal of Plant Pathology

ISSN

11254653

Page

23-29

Document Type

Article

Subject

Phylotyping, Ralstonia pseudosolanacearum, Ralstonia solanacearum, Soil-borne plant disease, Tomato bacterial wilt

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