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Outline
L-carvone, a volatile monoterpene compound, widely present in herbaceous plants, such as Labiatae and Umbelliferae, exhibits excellent antifungal effects against common plant pathogens. To further clarify the fumigation antifungal activity of L-carvone on wheat Fusarium crown rot (FCR) pathogens and investigate its inhibitory mechanism, this experiment employed the mycelial growth rate method to determine the fumigation inhibitory activity of L-carvone against four FCR pathogens. The infection ability and morphological changes of Fusarium pseudograminearum mycelium after fumigation with L-carvone were observed and analyzed to explore its antifungal mechanism. The results showed that L-carvone exhibited strong fumigation inhibitory effects on all the tested FCR pathogens; the EC50 (the concentration of the agent that achieves a 50% inhibition rate against the tested pathogen) for F. asiaticum, Bipolaris sorokiniana, F. pseudograminearum, and F. proliferatum were 2.13, 6.12, 7.20, and 19.05 μL·L-1, respectively. After fumigation treatment with L-carvone, the hyphae of F. pseudocercosporum exhibited abnormalities, breakage, and leakage of protoplasm, with a significant increase in extracellular relative conductivity, reaching up to 232.07%. Leakage of nucleic acids and proteins increased, with absorbance values at 260 and 280 nm reaching 2.20 and 1.33, respectively. PI staining results indicated that the cell membrane integrity of F. pseudocercosporum was disrupted and permeability was enhanced after fumigation treatment with L-carvone. The study demonstrated that L-carvone had a good control effect on FCR.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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