| Summary: | 博士 === 國立中興大學 === 昆蟲學系 === 94 === In this study were to examine the interactions between plants, plant pathogens and insect herbivores. The tomato (Lycopersicon esculentum) was used as the model plant, and tomato’s pathogens (Fusarium oxysporum f. sp. lycopersici, Ralstonia solanacearum, and Cucumber mosaic virus) and cutworm (Spodopters litura) were used as materials of phytopathogens and herbivores. The effects of phytopathogens and herbivores on the defense responses include quantities of total protein and total phenol and the activities of polyphenol oxidase and peroxidase of the tomato were assayed in damaged leaflets and compared with untreated leaflets. The nutrition index of insect herbivores, such as duration, approximate digestibility, total consumption, efficiency of conversion of digested food, efficiency of conversion of ingested food, relative growth rate, relative consumption rate, feeding preference of larvae, and oviposition preference of female moth, were compared between treatments. The results showed a significant increase in the compound quantity and enzyme activity of all differently treated tomatoes, as compared to untreated control. Furthermore, cutworm had decreased approximate digestibility, total consumption, relative growth rate, and relative consumption rate reared on tomato plants that were pervious treated by pathogens or herbivores. According to the phytochemical analysis and larvae preference, we consider that the total phenol and polyphenol oxidase may affect development of armyworm. No significant difference was observed in feeding preference and oviposition preference of cutworm. In this experiment, we clearly indicated the indirect interaction of tomato, plant pathogens, and herbivores.
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