...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Variation in resistance to parasitism in aphids is due to symbionts not host genotype
【24h】

Variation in resistance to parasitism in aphids is due to symbionts not host genotype

机译：蚜虫对寄生虫的抵抗力变化是由于共生体不是宿主基因型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Natural enemies are important ecological and evolutionary forces, and heritable variation in resistance to enemies is a prerequisite for adaptive responses of populations. Such variation in resistance has been previously documented for pea aphids (Acyrthosiphon pisum) attacked by the parasitoid wasp Aphidius ervi. Although the variation was presumed to reflect genotypic differences among the aphids, another potential source of resistance to A. ervi is infection by the facultative bacterial symbiont Hamiltonelia defensa. Here, we explored whether variation among symbiont isolates underlies variation among A. pisum clones in resistance to A. ervi. Although maternally transmitted, H. defensa is sometimes horizontally transferred in nature and can be experimentally established in clonal aphid lineages. We established five H. defensa isolates in a common A. pisum genetic background. All of the five isolates tested, including one originating from another aphid species, conferred resistance. Furthermore, isolates varied in levels of resistance conferred, ranging from 19% to nearly 100% resistance. In contrast, a single H. defensa isolate established in five different aphid clones conferred similar levels of resistance; that is, host genotype did not influence resistance level. These results indicate that symbiont-mediated resistance to parasitism is a general phenomenon in A. pisum and that, at least for the isolates and genotypes considered, it is the symbiont isolate that determines the level of resistance, not aphid genotype or any interaction between isolate and genotype. Thus, acquisition of a heritable symbiont appears to be a major mode of adaptation to natural enemy pressure in these insects.
机译：天敌是重要的生态和进化力量，抵抗力的可遗传变化是种群适应性反应的前提。这种抵抗力的变化先前已被寄生虫黄蜂Aphidius ervi攻击的豌豆蚜虫（Acyrthosiphon pisum）所记录。尽管该变异被认为反映了蚜虫之间的基因型差异，但是对A. ervi的抗药性的另一个潜在来源是兼性细菌共生哈密尔顿氏菌的感染。在这里，我们探讨了共生菌分离株之间的变异是否在pi。A. pisum克隆对A. ervi。尽管是母体传播的，但防御性嗜血杆菌有时在自然界中是水平转移的，并且可以通过实验在克隆的蚜虫谱系中建立。我们在常见的A. pisum遗传背景中建立了五个H. defensa分离株。测试的所有五种分离物均具有抗药性，其中一种来自另一种蚜虫。此外，分离株的抗性水平也有所不同，范围从19％到近100％。相比之下，在五个不同的蚜虫克隆中建立的单个防御链球菌分离株具有相似的抗性水平。也就是说，宿主基因型不影响抗性水平。这些结果表明共生体介导的对寄生虫的抗性是皮毛曲霉的普遍现象，并且至少对于所考虑的分离物和基因型，共生分离物决定了抗性水平，而不是蚜虫基因型或分离物之间的任何相互作用。和基因型。因此，获得可遗传的共生体似乎是适应这些昆虫中天敌压力的主要方式。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号