Juvenile hormone mediates a trade-off between primary and secondary sexual traits in stalk-eyed flies
Juvenile hormone mediates a trade-off between primary and secondary sexual traits in stalk-eyed flies
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DOI：
10.1111/j.1525-142x.2006.00089.x
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发表时间：
2006-03-01
影响因子：
2.9
通讯作者：
Fry, CL
中科院分区：
文献类型：
--
作者：
Fry, CL
发育中的身体部位之间的权衡可能会导致各种类群中异速生长比例关系的变化。实验证据表明，保幼激素（JH）的循环水平和发育中的身体部位对JH的敏感性可以影响多型昆虫的形态。然而，在何种程度上JH可以调节两个发展的特点，规模不断与身体大小和权衡这些特点之间的很大程度上是未知的。在这里，我提出的证据表明，JH模拟甲氧普烯适用于末龄幼虫的茎眼苍蝇（Cyrtodiopsis dalmanni）可以诱导男性产生较大的眼柄相对于他们的身体大小。睾丸生长，精子转移和卵子成熟的检查表明，JH诱导成年男性，但不是女性的眼跨度和性腺发育之间的权衡。性成熟年龄不受幼虫JH应用于任何性别。总的来说，这些结果与JH介导的资源分配以睾丸为代价的眼跨度是一致的，并表明生产夸大性状的潜在成本。
Trade-offs between developing body parts may contribute to variation in allometric scaling relationships in a variety of taxa. Experimental evidence indicates that both circulating levels of juvenile hormone (JH) and sensitivities of developing body parts to JH can influence morphology in polyphenic insects. However, the extent to which JH may regulate both the development of traits that scale continuously with body size and trade-offs between these traits is largely unknown. Here, I present evidence that the JH analog methoprene applied to final instar larvae of a stalk-eyed fly (Cyrtodiopsis dalmanni) can induce males to produce larger eye-stalks relative to their body size. Examination of testis growth, sperm transfer, and egg maturation indicates that JH induces a trade-off between eye-span and gonad development in adult males, but not females. Age at sexual maturity was unaffected by larval JH applications to either sex. Collectively, these results are consistent with JH-mediated allocation of resources to eye-span at the expense of testes, and indicate potential costs for the production of an exaggerated trait.