Stay B, Woodhead A P
Department of Biology, University of Iowa, Iowa City 52242.
Gen Comp Endocrinol. 1990 Jan;77(1):127-35. doi: 10.1016/0016-6480(90)90213-6.
In Diploptera punctata, female corpora allata (CA) show a cycle of juvenile hormone (JH) synthesis in response to oocyte development. Whether the smaller male CA can also respond to the ovary was investigated. One or two pairs of male CA were implanted into allatectomized females during the period corresponding to egg growth. Low rates and no cycle of JH synthesis occurred in CA of sham-operated males or in male CA implanted into males or ovariectomized females. On the contrary, male CA, either one or two pairs, implanted into females with ovaries showed a cycle of increase and decrease in JH synthesis similar in pattern to that of female glands implanted into females. However, the peak of JH synthesis for a single pair of male CA occurred 1 day later than the peak for two pairs of male CA or one pair of female CA. Also the maximum rates of synthesis of one or two pairs of male CA were lower than those of female glands. However, rates of JH synthesis per cell and per unit volume of corpus allatum tissue were higher for one pair of male CA than for one pair of female CA. Thus, the intrinsic difference between male and female CA appears to be their size rather than rate of JH synthesis and ability to respond to ovarian stimuli.
在点刻蠊中，雌性咽侧体（CA）会根据卵母细胞的发育呈现出保幼激素（JH）合成的周期性变化。研究了较小的雄性咽侧体是否也能对卵巢做出反应。在与卵生长相对应的时期，将一对或两对雄性咽侧体植入去咽侧体的雌性体内。假手术雄性的咽侧体或植入雄性或去卵巢雌性体内的雄性咽侧体中，JH合成速率较低且无周期性变化。相反，植入有卵巢的雌性体内的一对或两对雄性咽侧体，其JH合成呈现出与植入雌性体内的雌性腺体相似的增减周期。然而，一对雄性咽侧体的JH合成峰值比两对雄性咽侧体或一对雌性咽侧体的峰值晚1天出现。而且，一对或两对雄性咽侧体的最大合成速率低于雌性腺体。不过，一对雄性咽侧体每细胞和每单位体积咽侧体组织的JH合成速率高于一对雌性咽侧体。因此，雄性和雌性咽侧体之间的内在差异似乎在于它们的大小，而非JH合成速率以及对卵巢刺激的反应能力。
