Effects of juvenile hormone on ecdysone-dependent development in the tobacco hornworm, Manduca sexta.
Effects of juvenile hormone on ecdysone-dependent development in the tobacco hornworm, Manduca sexta.
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保幼激素对烟草天蛾（Manduca sexta）蜕皮激素依赖性发育的影响。
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
Carroll M. Williams
中科院分区：
文献类型：
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作者：
L. Safranek;B. Cymborowski;Carroll M. Williams
1. 保幼激素延迟或阻止颈部结扎的第四龄烟草天蛾幼虫和停止取食前第五龄颈部结扎的变态发生。2．流浪期开始后，JH 恰恰产生了相反的效果，因为它加速了变态的开始。对于游走的幼虫和蛹来说都是这种情况，无论它们是完整的还是经过大脑切除或颈部结扎。3。这些发现表明，JH 在控制变态过程中发挥着先前未曾预料到的转变作用。4．四龄幼虫在脑切除后不会进一步发育，除非它们也通过颈部结扎有效地切除了乳腺。显然，JH的分泌和抑制作用在无脑四龄幼虫中持续存在。5．相比之下，无脑的五分之一通常能够启动变态，尽管他们的CA持续存在。每天使用 JH 可以阻止发育。效果消失...
1. Juvenile hormone delayed or prevented the onset of metamorphosis by neck-ligated fourth-instar tobacco hornworm larvae and by fifth instars neck-ligated prior to the cessation of feeding.2. After the onset of the wandering period J H had precisely the opposite effects in that it accelerated the onset of metamorphosis. This was the case both for wandering larvae and for pupae, irrespective of whether they were intact or subjected to brain removal or neck ligation.3. These findings point to a previously unsuspected shifting role of JH in the control of metamorphosis.4. Fourth-instar larvae underwent no further development after brain removal unless they were also effectively allatectomized by neck ligation. Evidently the secretion and inhibitory action of JH persists in brainless fourth-instar larvae.5. Brainless fifths, by contrast, were often able to initiate metamorphosis despite the continued presence of their CA. Development could be prevented by daily application of JH. The disappearance of effecti...