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

Masashi Fujinaga,Hideki Ogiso,Hirosuke Shinohara,Seiya Tsushima, Norio Nishimura,Masayuki Togawa,Hideki Saito,Masayuki Nozue

Journal of General Plant Pathology Mol Plant Microbe Interact Phytopathology Mol Plant Microbe Interact Evolution Annu Rep Kanto Plant Prot Soc J Gen Plant Pathol Plant Dis Phytoparasitica Plant Pathol Bull Plant Dis Mycol Res Jpn J Phytopathol J Gen Plant Pathol Phytopathology J Mol Evol Phytopathology Plant Dis Trans Mycol Soc Jpn Iran J Plant Pathol Ann Phytopathol Soc Jpn Phytopathology Kyushu Plant Prot Res Shokubutsu Boueki (Plant Protection) J Gen Plant Pathol Can J Bot Mol Bio Evol Nucleic Acids Res（2005）

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摘要

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.

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关键词

Fusarium oxysporum f. sp. lactucae,Lactuca sativa

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