论文标题
噬菌体对寄生虫抗性的影响
Bacteriophage effect on parasitism resistance
论文作者
论文摘要
许多研究表明，保护主机$ \ it {acyrthosiphon〜pisum} $（hemiptera，aphididae）免受寄生虫$ \ i \ it {aphidius〜Ervi} $（hymenoptera，braconidae）的互动，并由中学的nam $ fefterny和hamine feed fanderty fef噬菌体$ \ it {apse} $（$ \ it {acyrthosiphon〜pisum} $ secondary endosymbiont）。这种相互作用由内共生体的分子机械产生的毒素组成，该机械由插入的$ \ it {apse} $基因编码。毒素阻止了寄生虫卵的发展，从而为宿主提供保护。但是，这种微观相互作用对宿主 - 寄生虫动力学的影响仍然是一个悬而未决的问题。我们基于噬菌体对寄生虫抗性的影响提出了一个新的数学模型。我们确定寄生虫攻击后噬菌体和宿主存活的垂直传播是潜在的共存驱动因素。另外，我们表明$ \ it {H.〜defensa} $的垂直传输与受保护人口灭绝的时间成正比。我们的结果表明，在寄生虫攻击后，受保护和未受保护的宿主的生存对于理解长宿主寄生虫动力学的平衡至关重要。最后，我们根据$ \ it {A. 〜pisum} $ Biotypes $ \ it {genista〜tinctoria} $和$ \ it {Medicago〜Sativa} $进行的实验说明了我们的模型。
Many studies have shown that the protection of the host $\it{Acyrthosiphon~pisum}$ (Hemiptera, Aphididae) against the parasitoid $\it{Aphidius~ervi}$ (Hymenoptera, Braconidae) is conferred by the interaction between the secondary endosymbiont $\it{Hamiltonella~defensa}$ and the bacteriophage $\it{APSE}$ ($\it{Acyrthosiphon~pisum}$ secondary endosymbiont). This interaction consists of the production of toxins by the endosymbiont's molecular machinery, which is encoded by the inserted $\it{APSE}$ genes. The toxins prevent the development of the parasitoid's egg, conferring protection for the host. However, the effects of this microscopic interaction on host-parasitoid dynamics are still an open question. We presented a new mathematical model based on the bacteriophage effect on parasitism resistance. We identified that the vertical transmission of the bacteriophage and the host survival after the parasitoid attack are potential drivers of coexistence. Also, we showed that the vertical transmission of $\it{H.~defensa}$ is proportional to the time that the protected population became extinct. Our results showed that the protected and unprotected hosts' survival after the parasitoid attack is fundamental to understanding the equilibrium of long host-parasitoid dynamics. Finally, we illustrated our model considering its parameters based on experiments performed with $\it{A.~pisum}$ biotypes $\it{Genista~tinctoria}$ and $\it{Medicago~sativa}$.
