Rickettsia symbiont in the pea aphid Acyrthosiphon pisum: Novel cellular tropism, effect on host fitness, and interaction with the essential symbiont Buchnera

Makiko Sakurai, Ryuichi Koga, Tsutomu Tsuchida, Xian Ying Meng, Takema Fukatsu*

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

215 被引用数 (Scopus)

抄録

In natural populations of the pea aphid Acyrthosiphon pisum, a facultative bacterial symbiont of the genus Rickettsia has been detected at considerable infection frequencies worldwide. We investigated the effects of the Rickettsia symbiont on the host aphid and also on the coexisting essential symbiont Buchnera. In situ hybridization revealed that the Rickettsia symbiont was specifically localized in two types of host cells specialized for endosymbiosis: secondary mycetocytes and sheath cells. Electron microscopy identified bacterial rods, about 2 μm long and 0.5 μm thick, in sheath cells of Rickettsia-infected aphids. Virus-like particles were sometimes observed in association with the bacterial cells. By an antibiotic treatment, we generated Rickettsia-infected and Rickettsia-eliminated aphid strains with an identical genetic background. Comparison of these strains revealed that Rickettsia infection negatively affected some components of the host fitness. Quantitative PCR analysis of the bacterial population dynamics identified a remarkable interaction between the coexisting symbionts: Buchnera population was significantly suppressed in the presence of Rickettsia, particularly at the young adult stage, when the aphid most actively reproduces. On the basis of these results, we discussed the possible mechanisms that enable the prevalence of Rickettsia infection in natural host populations in spite of the negative fitness effects observed in the laboratory.

本文言語英語
ページ(範囲)4069-4075
ページ数7
ジャーナルApplied and Environmental Microbiology
71
7
DOI
出版ステータス出版済み - 2005/07

ASJC Scopus 主題領域

  • バイオテクノロジー
  • 食品科学
  • 応用微生物学とバイオテクノロジー
  • 生態学

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