Interspecific crossing between blue‐tailed damselflies Ischnura elegans and I. senegalensis in the laboratory,Entomological Science

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Interspecific crossing between blue‐tailed damselflies Ischnura elegans and I. senegalensis in the laboratory
Entomological Science ( IF 0.7 ) Pub Date : 2020-03-15 , DOI: 10.1111/ens.12408
Genta Okude _{1,

2} , Takema Fukatsu _{1,

2,

3} , Ryo Futahashi ₂

Affiliation

Ischnura species (Odonata) are among the most common damselflies in the world, which often exhibit female color polymorphisms. One morph, called androchrome, is similar to males in its color pattern, whereas the other morphs, generally referred to as gynochromes, exhibit female‐specific colors. In several Ischnura species, the female polymorphism is heritable, although molecular and genetic mechanisms remain largely unknown. The dominant‐recessive patterns of the female color morphs may differ between species. For example, androchromic females are dominant to gynochromic females in Ischnura elegans, whereas androchromic females are recessive in Ischnura senegalensis. Here we report a case of interspecific hybridization between a gynochrome female of I. elegans and a male of I. senegalensis in the laboratory. We obtained 61 hybrid adult offspring, of which all 31 females were of gynochrome morph. DNA analyses of the hybrids confirmed that nuclear DNA sequences were derived from both parent species, whereas mitochondrial DNA sequences were maternally inherited. In the hybrids, the postocular spots of female heads, the shape of male appendages, and the color of female's cerci resembled those of I. elegans, whereas the size of abdominal blue spots was similar to that of I. senegalensis. The shape of prothorax and basal abdominal markings were intermediate in females. The larval developmental traits and the morphological changes in the final larval instar of the hybrids were similar to those of I. senegalensis. To our knowledge, this is the first report of hybrids between two damselfly species with different dominant‐recessive patterns of female color morphs.

中文翻译：

蓝尾豆娘 Ischnura elegans 与 I. senegalensis 在实验室中的种间杂交

Ischnura 物种（Odonata）是世界上最常见的豆娘之一，它们经常表现出雌性颜色多态性。一种称为雄性色素的变体在颜色模式上与雄性相似，而其他变体，通常称为雌性色素，表现出雌性特有的颜色。在几个 Ischnura 物种中，雌性多态性是可遗传的，尽管分子和遗传机制在很大程度上仍然未知。雌性颜色变体的显性-隐性模式可能因物种而异。例如，在 Ischnura elegans 中，雄色雌性对雄色雌性占优势，而在 Ischnura senegalensis 中，雄色雌性是隐性的。在这里，我们报告了实验室中一例 I. elegans 雌性雌性和 I. senegalensis 雄性之间的种间杂交。我们获得了 61 只杂交成年后代，其中31只雌性均为雌雄同体。杂种的 DNA 分析证实核 DNA 序列来自两个亲本物种，而线粒体 DNA 序列是母系遗传的。在杂交种中，雌性头部的眼后斑、雄性附属器的形状和雌性尾尾的颜色与线虫相似，而腹部蓝点的大小与塞内加尔线虫相似。前胸和腹部基部标记的形状在雌性中处于中等水平。杂种的幼虫发育性状和幼虫终龄形态变化与I. senegalensis相似。据我们所知，这是关于雌性颜色变体的显性-隐性模式不同的两个豆娘物种之间杂交的第一份报告。

更新日期：2020-03-15

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