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文章摘要:<正>A wide array of biological events in the life history of insects are orchestrated by juvenile hormone （JH） and 20-hydroxyecdysone（20E）[1]. They control embryonic development, molting, metamorphosis, and reproduction. Some processes are governed by one of the two hormones while others rely on both. Larval development and metamorphosis in the tobacco hornworm, Manduca sexta, is a classic example manifesting the coordination of JH and20E. 20E triggers every molt in M. sexta, from larval-larval molt to larval-pupal and pupal-adult molts; the nature of molting is defined by JH [2]. High levels of JH in the early larva instars exert the anti-metamorphic function and 20E initiates a molt that leads to another larger larva. Once the hornworm reaches a critical weight （a body size ‘‘check-point"）, the synthesis of JH is halted.In the absence of JH, 20E instigates the metamorphic program,

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论文分类号:Q968

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