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Updated: Jan 28, 2026

Improved UPLC-UV Method for the Quantification of Vitamin C in Lettuce Varieties Lactuca sativa L. and Crop Wild Relatives Lactuca spp.
Published on: June 30, 2020
Vegetative Compatibility Groups of Fusarium oxysporum f. sp. lactucae from Lettuce
Matias Pasquali1, Flavia Dematheis1, Giovanna Gilardi1
1Di.Va.P.R.A. and Centre of Competence for the Innovation in the Agro-Environmental Field (AGROINNOVA), via Leonardo da Vinci, 44 10095 Grugliasco (TO), Italy.
Abstract:
Fusarium 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 1 were assigned to the major VCG 0300. Taiwanese isolates type 1 were assigned to VCG 0301. The hypothesis that propagules of Fusarium oxysporum f. sp. lactucae 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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