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- W4366334547 abstract "Abstract Chrysanthemum black spot disease caused by Alternaria alternate infestation is a widespread and extremely destructive foliar disease of chrysanthemums. Therefore, it is necessary to breeding germplasm resources of disease-resistant chrysanthemum to deal with this problem, and the identification of the disease-resistant chrysanthemum-related genera is of great significance to improve the targeted traits of chrysanthemums. This study was aimed at evaluating the disease resistance of chrysanthemum-related genera by using two different artificial inoculation methods and through the analysis of the physical and chemical defense mechanisms of plants. Here, according to the disease index, we divided 14 germplasms into three grades: 2 disease-resistant germplasms, 11 moderately sensitive germplasms, and 1 sensitive germplasm. We found that the trichomes density and wax content on the leaf surface of the disease-resistant germplasms were significantly higher than those of the sensitive germplasm, while the stomatal aperture and size of the resistant material were smaller than that of the sensitive germplasm. In addition, we found that the leaf extract of the disease-resistant germplasm effectively inhibited the growth rate of A. alternate mycelium on the plate, and GC-MS components found that the leaves of resistant germplasm contained more volatile antifungal organic compounds, of which falcarinoland Germacrene D might play an important role in resistance to chrysanthemum black spot disease. In summary, the physiochemical defense mechanisms explored in this study provided a reference for resolving disease resistance in chrysanthemums, and the resistant germplasm identified can be used as parents for hybrid breeding or grafting rootstocks for improved resistance in chrysanthemums." @default.
- W4366334547 created "2023-04-20" @default.
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- W4366334547 date "2023-04-18" @default.
- W4366334547 modified "2023-10-16" @default.
- W4366334547 title "Identification of resistance to black spot disease and potential defense mechanisms in Chrysanthemum-related genera" @default.
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- W4366334547 doi "https://doi.org/10.21203/rs.3.rs-2791629/v1" @default.
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