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- Title
Phylogenetic relationships between the lettuce root rot pathogen Fusarium oxysporum f. sp. lactucae races 1, 2, and 3 based on the sequence of the intergenic spacer region of its ribosomal DNA.
- Authors
Fujinaga, Masashi; Ogiso, Hideki; Shinohara, Hirosuke; Tsushima, Seiya; Nishimura, Norio; Togawa, Masayuki; Saito, Hideki; Nozue, Masayuki
- Abstract
The genetic relationship between the vegetative compatibility groups (VCGs) and between physiological races of Fusarium oxysporum f. sp. lactucae (FOL), the causal pathogen of lettuce root rot, was determined by analyzing the intergenic spacer (IGS) region of its ribosomal DNA. A total of 29 isolates containing a type strain were tested: 24 Japanese isolates, 2 Californian isolates, and 3 Italian isolates. Three races (races 1, 2, and 3) were found in Japan, and race 1 was also distributed in California and Italy. Races 1, 2, and 3 each belonged to a distinct VCG: VCG-1, VCG-2, and VCG-3 (VCG-3-1, VCG-3-3), respectively. Phylogenetic (neighbor-joining) analysis of the IGS sequences revealed that races 1, 2, and 3 coincided with three phylogenetic groups (PG): PG-1, PG-2, and PG-3, respectively. These results indicate that the three races are genetically quite different and have a strong correlation with VCGs and phylogenetic groupings.
- Subjects
FUSARIUM oxysporum; LETTUCE; RECOMBINANT DNA; PLANT phylogeny; PHYLOGENY
- Publication
Journal of General Plant Pathology, 2005, Vol 71, Issue 6, p402
- ISSN
1345-2630
- Publication type
Article
- DOI
10.1007/s10327-005-0226-z