4.1 Article

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

期刊

JOURNAL OF GENERAL PLANT PATHOLOGY
卷 75, 期 2, 页码 125-130

出版社

SPRINGER JAPAN KK
DOI: 10.1007/s10327-009-0152-6

关键词

Allium fistulosum; Fusarium wilt; Mating type; Phylogeny

资金

  1. Nissan Seed Foundation

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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.

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