F. graminearum is distributed worldwide and an important plant pathogen that causes the disease FHB (Fusarium head blight) such as rice, wheat and corn. In addition, the fungi produces mycotoxins (e.g. Trichothecenes, Zearalenone) in infected plants. RNA Interference (RNAi) participates in growth, p...
F. graminearum is distributed worldwide and an important plant pathogen that causes the disease FHB (Fusarium head blight) such as rice, wheat and corn. In addition, the fungi produces mycotoxins (e.g. Trichothecenes, Zearalenone) in infected plants. RNA Interference (RNAi) participates in growth, physiological processes, gene regulation, genomic stability and immune response in several fungus. The objective of this study was to determine the roles of RNAi pathway in sexual reproduction which is an essential process for plant disease development by F. graminearum. In this study, we analyzed the function of the genes involved in RNAi pathway using targeted gene deletion and BiFC between FgSMS-2 and FgDCL-1 in F. graminearum. A targeted deletion of both FgQDE-3 and FgQDE-1 caused the deletion strain (ΔFgQDE-3;ΔFgQDE-1) defective in ascospore maturation and the ΔFgQDE-3;ΔFgRecQ-2 strains showed severe growth defect compared with wild-type. These results indicate that FgQDE-3 and FgQDE-1 plays an important role in regulating the meiosis and post meiotic cell division for ascospore production. FgQDE-3 and RecQ-2 involved in the process of growth and physiological processes. During the ascus/ascospore development, FgSMS-2 and FgDCL-1 interacts in the cytoplasm, and its interaction is confirmed to be specifically expressed during the sexual development early stage.Together with the Fusarium graminearum species complex, F. culmorum is a major member of the causal agents of Fusarium head blight on cereals such as wheat, barley and corn. It causes significant yield and quality losses and results in the contamination of grain with mycotoxins that are harmful to humans and animals. In Korea, F. culmorum is listed as a quarantine fungal species since it has yet to be found in the country. In this paper, we report that two isolates (J1 and J2) of F. culmorum were collected from the air at a rice paddy field in Korea. Species identification was confirmed by phylogenetic analysis using multilocus sequence data derived from five genes encoding translation elongation factor, histone H3, phosphate permease, a reductase, and an ammonia ligase and by morphological comparison with reference strains. Both diagnostic PCR and chemical analysis confirmed that these F. culmorum isolates had the capacity to produce nivalenol, the trichothecene mycotoxin, in rice substrate. In addition, both isolates were pathogenic on wheat heads and corn stalks. This is the first report on the occurrence of F. culmorum in Korea.
F. graminearum is distributed worldwide and an important plant pathogen that causes the disease FHB (Fusarium head blight) such as rice, wheat and corn. In addition, the fungi produces mycotoxins (e.g. Trichothecenes, Zearalenone) in infected plants. RNA Interference (RNAi) participates in growth, physiological processes, gene regulation, genomic stability and immune response in several fungus. The objective of this study was to determine the roles of RNAi pathway in sexual reproduction which is an essential process for plant disease development by F. graminearum. In this study, we analyzed the function of the genes involved in RNAi pathway using targeted gene deletion and BiFC between FgSMS-2 and FgDCL-1 in F. graminearum. A targeted deletion of both FgQDE-3 and FgQDE-1 caused the deletion strain (ΔFgQDE-3;ΔFgQDE-1) defective in ascospore maturation and the ΔFgQDE-3;ΔFgRecQ-2 strains showed severe growth defect compared with wild-type. These results indicate that FgQDE-3 and FgQDE-1 plays an important role in regulating the meiosis and post meiotic cell division for ascospore production. FgQDE-3 and RecQ-2 involved in the process of growth and physiological processes. During the ascus/ascospore development, FgSMS-2 and FgDCL-1 interacts in the cytoplasm, and its interaction is confirmed to be specifically expressed during the sexual development early stage.Together with the Fusarium graminearum species complex, F. culmorum is a major member of the causal agents of Fusarium head blight on cereals such as wheat, barley and corn. It causes significant yield and quality losses and results in the contamination of grain with mycotoxins that are harmful to humans and animals. In Korea, F. culmorum is listed as a quarantine fungal species since it has yet to be found in the country. In this paper, we report that two isolates (J1 and J2) of F. culmorum were collected from the air at a rice paddy field in Korea. Species identification was confirmed by phylogenetic analysis using multilocus sequence data derived from five genes encoding translation elongation factor, histone H3, phosphate permease, a reductase, and an ammonia ligase and by morphological comparison with reference strains. Both diagnostic PCR and chemical analysis confirmed that these F. culmorum isolates had the capacity to produce nivalenol, the trichothecene mycotoxin, in rice substrate. In addition, both isolates were pathogenic on wheat heads and corn stalks. This is the first report on the occurrence of F. culmorum in Korea.
Keyword
#붉은곰팡이 RNA 간섭 조절 경로 유전자
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