Are there genetic trade-offs between immune and reproductive investments in Tribolium castaneum?
Are there genetic trade-offs between immune and reproductive investments in Tribolium castaneum?
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赤拟谷盗的免疫和生殖投资之间是否存在遗传权衡？
DOI：
10.1016/j.meegid.2013.06.007
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Hangartner S
中科院分区：
文献类型：
--
作者：
Hangartner S
寄生虫对宿主施加强烈的选择来保护自己，这预计会导致与繁殖等其他适应性特征的权衡。在这里，我们使用经过实验进化的赤拟谷盗来测试生殖性状和免疫力之间的遗传权衡。这些品系通过不同的性别比例（偏雌性、平等性和偏雄性）而经历了不同的性选择强度。经过 56 代后，这些品系出现了显着分化，那些经历了高度性选择的品系进化出了在繁殖成功方面更具竞争力的雄性，以及对多重交配更具抵抗力的雌性。经过两代宽松选择后，对所有选定品系进行了免疫测量（酚氧化酶（PO）活性）和宿主对微孢子虫白色微孢子虫的抗性评估。与我们的预期相反，我们没有发现任何证据表明生殖投资和免疫之间存在遗传权衡。 PO 和 Nosema 抗性在品系之间没有差异，尽管它们由于性选择和冲突的变化而在生殖投入方面存在差异。然而，总体而言，我们发现雌性具有较高的 PO 活性，并且在无微孢子虫对照治疗中比雄性存活时间更长，这表明雌性通常比雄性在对照条件下对 PO 和存活投入更多。这一结果符合贝特曼原则，即雌性通过提高免疫力和寿命来获得健康，而雄性通过提高交配成功率来获得健康。
Parasites impose strong selection on hosts to defend themselves, which is expected to result in trade-offs with other fitness traits such as reproduction. Here we test for genetic trade-offs between reproductive traits and immunity usingTribolium castaneumlines that were subject to experimental evolution. The lines have been exposed to contrasting sexual selection intensities via different sex ratios (female-biased, equal and male-biased). After 56 generations, the lines have significantly diverged and those experiencing high sexual selection have evolved males who are superior competitors for reproductive success, and females who are more resistant to multiple mating. All selected lines were assessed for both an immune measurement (phenoloxidase (PO) activity) and host resistance to the microsporidianNosema whiteiafter two generations of relaxed selection. In contrast to our expectations we did not find any evidence for a genetic trade-off between investment in reproduction and immunity. Both PO andNosemaresistance did not differ between lines, despite their divergences in reproductive investment due to variation in sexual selection and conflict. Nevertheless, overall we found that females had higher PO activities and in theNosemafree control treatment survived longer than males, suggesting that females generally invest more in PO and survival under control conditions than males. This result fits the Bateman’s principle, which states that females gain fitness through increased immunity and longevity, while males gain fitness through increased mating success.
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