Fungal Diseases

Journal of General Plant Pathology

, Volume 75, Issue 2, pp 125-130

Genetic diversity and pathogenicity of Fusarium oxysporum isolated from wilted Welsh onion in Japan

  • Maha Laksha Mudiyanselage Chandrika DissanayakeAffiliated withThe United Graduate School of Agricultural Sciences, Tottori University
  • , Rumi KashimaAffiliated withDepartment of Biological and Environmental Sciences, Faculty of Agriculture, Yamaguchi University
  • , Shuhei TanakaAffiliated withDepartment of Biological and Environmental Sciences, Faculty of Agriculture, Yamaguchi University
  • , Shin-ichi ItoAffiliated withDepartment of Biological and Environmental Sciences, Faculty of Agriculture, Yamaguchi University Email author 

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Abstract

Thirty isolates of Fusarium oxysporum from wilted Welsh onion plants were examined for their diversity in nucleotide sequences of the ribosomal DNA (rDNA) intergenic spacer (IGS) region and for pathogenicity with regard to five Welsh onion cultivars. Phylogenetic analysis based on the IGS sequences revealed polyphyletic origins of the isolates and a relationship between phylogeny and pathogenicity; low virulence isolates differed genetically from those with high and moderate virulence. Mating type analysis revealed that all F. oxysporum isolates were MAT1-1 idiomorphs, suggesting that the pathogens may be clonal in the fields examined.

Keywords

Allium fistulosum Fusarium wilt Mating type Phylogeny