期刊
PLANT DISEASE
卷 89, 期 3, 页码 237-240出版社
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PD-89-0237
关键词
Lactuca sativa
Fwarium oxysporum f. sp. lactucae, the causal agent of Fusarium wilt of lettuce, has been reported in three continents in the last 10 years. Forty-seven isolates obtained from infected plants and seed in Italy. the United States, Japan, and Taiwan were evaluated for pathogenicity and vegetative compatibility. Chlorate-resistant, nitrate-nonutilizing mutants were used to determine genetic relatedness among isolates from different locations. Using the vegetative compatibility group (VCG) approach, all Italian and American isolates, type 2 Taiwanese isolates, and a Japanese race I were assigned to the major VCG 0300. Taiwanese isolates type I were assigned to VCG 0301. The hypothesis that propagules of Fusariuln oxysporuni f. sp. lactilcae that caused epidemics on lettuce in 2001-02 in Italian fields might have spread via import and use of contaminated seeds is discussed.
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