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- W2380353372 abstract ":The effects of Triadimefon, an ergosterol biosynthesis-inhibiting fungicide, on development of apple scab pathogen, Venturia inaequalis on the leaves were examined by means of scanning and transmission electron microscopy as well as cytochemical labeling techniques. The results showed that the fungicide retarded the germination of conidia, caused deformation of germ tubes and inhibited formation of appressoria on the leaves treated with fungicide 1 day before inoculation. The application of the fungicide 6 days after inoculation (before symptom appearing) caused the pronounced ultrastructural changes in the subcuticular hyphae and the conidial stroma. These changes included protoplasm necrosis, irregularly thickenings of cell walls and enlargement of vacuoles in the hyphal cells, which disrupt the further development of the pathogen in fungicide-treated leaves. Furthermore, the collapsed or flattened conidia and conidiophore were often detected on the leaves treated with the fungicide 12 days after inoculation (after symptom appearing), and the subcuticular hyphae, conidial stroma and conidiophore also showed markedly alterations in the cytoplasm and cell walls. These results indicated that the fungicide had adverse effects on the continuing sporulation and development of the pathogen. Moreover, cytochemical labeling of ?-1,3-glucan and chitin occurred in the cell walls of the hyphae from the fungicide-treated and the untreated leaves. However, the labeling densities for these two cell wall components were much greater in the cell walls of the hyphae from the fungicide-treated leaves than those from the untreated leaves, indicating the excessive accumulation of ?-1,3-glucan and chitin in the cell walls after fungicide treatment due to the detrimental effects of the fungicide on the structure and functions of the hyphal membrane." @default.
- W2380353372 created "2016-06-24" @default.
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- W2380353372 date "2001-01-01" @default.
- W2380353372 modified "2023-09-25" @default.
- W2380353372 title "EFFECTS OF ERGOSTEROL BIOSYNTHESIS-INHIBITING FUNGICIDE TRIADIMEFON ON THE DEVELOPMENT OF VENTURIA INAEQUALIS ON APPLE LEAVES" @default.
- W2380353372 hasPublicationYear "2001" @default.
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