Population Genetic Analyses and Trichothecene Genotype Profiling of Causing Wheat Crown Rot in Henan, China.

In China, has emerged as a major pathogen causing Fusarium crown rot (FCR) and caused significant losses. Studies on the pathogen's properties, especially its mating type and trichothecene chemotypes, are critical with respect to disease epidemiology and food/feed safety. There are currently few available reports on these issues. This study investigated the species composition, mating type idiomorphs, and trichothecene genotypes of spp. causing FCR in Henan, China. A significant shift in induced FCR was found in the present study. Of the 144 purified strains, 143 were , whereas only 1 was identified. Moreover, a significant trichothecene-producing capability of strains from Henan was observed in this work. Among the 143 . strains identified, with a 15ADON genotype was found to be predominant (133 isolates), accounting for 92.36% of all strains, followed by with a 3ADON genotype, whereas only one NIV genotype strain was detected. Overall, a relatively well-balanced 1:1 ratio of the population was found in Henan. To the best of our knowledge, this is the first study that has examined the populations responsible for FCR across the Henan wheat-growing region.