Ladybirds as a model system for the study of male-killing symbionts
Ladybirds as a model system for the study of male-killing symbionts
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DOI：
10.1007/bf02769875
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发表时间：
1997-01-01
期刊：
影响因子：
--
通讯作者：
Hurst, GDD
中科院分区：
文献类型：
--
作者：
Majerus, MEN;Hurst, GDD
在胚胎发育期间杀死雄性而不是雌性宿主的母系遗传细菌出现在许多食蚜瓢虫中。英文名：Adalia bipunctata（L.）已经表明杀死雄性的病原体是立克次氏体属的一种细菌。在瓢虫科中，雄性杀死细菌的行为的主要优势已经被确定。雄性死亡后，资源重新分配发生通过兄弟姐妹吃卵：雌性新生幼虫感染的母亲获得一个显着的生存优势，吃索马的死亡男性兄弟姐妹。此外，受感染的雌性的后代由于在受感染的窝中吃的卵孵化率较低而遭受同类相食的风险降低。二点的可能窝藏雄性杀手的物种可能会在窝中产卵，显示同胞卵相食，并表现出较高的新生儿死亡率。最近的工作表明，雄性杀手发生在一些其他食蚜瓢虫与预测的特征。分子遗传学分析已经初步鉴定出三种与杀雄相关的细菌共生体，它们来自三个遗传学上遥远的细菌类群。因此，我们认为，在具有这些功能的瓢虫，杀雄可能会演变在一个分类学上不同的范围内的遗传bacteries.The影响的杀雄细菌的存在下，宿主瓢虫的人口统计学，并对主机线粒体DNA的变异进行了讨论。食蚜瓢虫被提议作为一个模式系统，研究与男性杀手感染的演变和后果。
Maternally inherited bacteria that kill male but not female hosts during embryogenesis occur in a number of aphidophagous coccinellids. Work on English Adalia bipunctata (L.), has shown the causative agent of male-killing to be a member of the bacterial genus Rickettsia. In coccinellids, the primary advantage of male-killing behaviour to the bacterium has been identified. Following male death, resource reallocation occurs through sibling egg cannibalism: female neonate larvae of infected mothers gain a significant survival advantage by eating the soma of their dead male siblings. In addition, daughters of infected females suffer a reduced risk of cannibalism as a result of the lower egg hatch I ate in infected clutches.Predictions as to which species of coccinellid are liable to harbour male-killers may be made on the basis of the selective advantages of male-killing identified in A. bipunctata. Species which may harbour male-killers are likely to lay eggs in clutches, show sibling egg cannibalism, and exhibit high neonate mortality.Recent work has shown male-killing to occur in a number of other aphidophagous coccinellids with the predicted characteristics. Molecular genetic analysis has putatively identified three bacterial symbionts associated with male-killing, coming from three phylogenetically distant bacterial taxa. We therefore suggest that within coccinellids that possess these features, male-killing may evolve in a taxonomically diverse range of inherited bacteria.The implications of the presence of male-killing bacteria on the population demography of host coccinellids, and on host mitochondrial DNA variability an discussed. The aphidophagous coccinellids are proposed as a model system for studying the evolution and consequences of infection with male-killers.