Juvenile hormone in relation to the larval-pupal transformation of the cecropia silkworm.
Juvenile hormone in relation to the larval-pupal transformation of the cecropia silkworm.
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保幼激素与天蚕幼虫-蛹转化的关系。
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
L. Riddiford
中科院分区：
文献类型：
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作者：
L. Riddiford
1. 在纺丝开始前，将天蚕幼体激素或类似幼体激素的混合物局部施用于5龄天蚕幼体，形成保留蛹的幼虫表皮结构。即使每天使用高剂量也不会导致幼虫多余的蜕皮。棉被在纺纱前2 ~ 4天对幼激素（JH）最为敏感。在成茧过程中，幼虫被膜和内脏对外源JH.4不敏感。在蛹前期，被膜仍不敏感，但局部应用JH.5可延缓内脏的幼虫-蛹转化。在蛹前期应用的幼激素阻止了正常的“关闭”在蛹蜕皮前大脑的促胸性活动。因此，蛹在5天内没有滞育，而是开始了成虫发育。后来的成虫外表正常，但保留了蛹或蛹-成虫表面。
1. Pupae retaining larval integumentary structures were formed after topical applications of Cecropia juvenile hormone or a mixture of juvenile hormone analogues to fifth instar Cecropia larvae prior to the initiation of spinning. Even daily applications of high doses did not result in a supernumerary larval molt.2. The integument was most sensitive to juvenile hormone (JH) two to four days prior to spinning.3. During the period of cocoon spinning, both the larval integument and viscera were insensitive to exogenous JH.4. During the prepupal period, the integument remained insensitive but the larval-pupal transformation of the viscera was retarded by topical application of JH.5. Juvenile hormone applied during the prepupal period prevented the normal "shutting-off" of the prothoracicotropic activity of the brain prior to pupal ecdysis. Consequently, the pupae did not diapause but initiated adult development within 5 days. The subsequent adults were normal externally but retained pupal or pupal-adult visce...