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Consequences of coinfection with protective symbionts on the host phenotype and symbiont titres in the pea aphid system

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Insect Science 2017年第5期24卷 798-808页

作者： Melanie Leclair Sarah Polin Thibaut Jousseaume Jean-Christophe Simon Akiko Sugio Stephanie Morliere Takema Fukatsu Tsutomu Tsuchida Yannick Outreman IGEPP Agrocampus Ouest INRA Universite de Rennes 1 Universite Bretagne-Loire Rennes France IGEPP Agrocampus OuestINRA Universit6 de Rennes 1 Le Rheu France Bioproduction Research Institute AIST Tsukuba Japan Graduate School of Science and Engineering University of Toyama Toyama Japan

Symbiotic associations between microbes and insects are widespread, and it is frequent that several symbionts share the same host individual. Hence, interactions can occur between these symbionts, influencing their respective abundance within the host with consequences on its phenotype. Here, we investigate the effects of multiple infections in the pea aphid, Acyrthosiphon pisurn, which is the host of an obligatory and several facultative symbionts. In particular, we study the influence of a coinfection with 2 protective symbionts： Harniltonella defensa, which confers protection against parasitoids, and Rickettsiella viridis, which provides protection against fungal pathogens and predators. The effects of Hamiltonella-Rickettsiella coinfection on the respective abundance of the symbionts, host fitness and efficacy of enemy protection were studied. Asymmetrical interactions between the 2 protective symbionts have been found： when they coinfect the same aphid individuals, the Rickettsiella infection affected Hamiltonella abundance within hosts but not the Hamiltonella-mediated protective phenotype while the Hamiltonella infection negatively influences the Rickettsiella-mediated protective phenotype but not its abundance. Harboring the 2 protective symbionts also reduced the survival and fecundity of host individuals. Overall, this work highlights the effects of multiple infections on symbiont abundances and host traits that are likely to impact the maintenance of the symbiotic associations in natural habitats.

关键词： Acyrthosiphon pisum Hamiltonella defensa host fitness multiple infections protective symbionts symbiont abundance

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Effects of Different Eucalyptus Varieties(Clones) on fitness and Development of Leptocybe invasa Fisher et La Salle

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Plant Diseases and Pests 2014年第2期5卷 13-17页

作者： Kang Wentong Zhang Huafeng Chen Shunli Wei Chujiang Zhang Silu Disease and Pest Control and Quarantine Station of Xiamen Forest Pest Management and Quarantine Bureau of Fujian Province College of Forestry Fujian Agriculture and Forestry University Disease and Pest Control and Quarantine Station of Shaxian

The damage status of L. invasa on different Eucalyptus varieties( clones) were surveyed in the field,and effects of Eucalyptus varieties on fitness,development and reproduction of this pest were studied in the study. Results showed that:( 1) Most of the major Eucalyptus varieties( clones) could be attacked by L. invasa in Fujian Province,and galls formed on E. urophylla × E. camaldulensis DH201-2,E. gradis QG3,E. dunnii,E. urophylla cU6,E. grandis × E. urophylla GL9,E. robusta and E. exserta; L. invasa could develop and complete its life cycle on above varieties.( 2) The damage degree of different Eucalyptus varieties( clones) was different from fitness degree to L. invasa. L. invasa had different selection frequency,fecundity and number of larvae per gall on different Eucalyptus varieties( clones).( 3) In addition to little difference in female ratios,L. invasa feeding different Eucalyptus varieties( clones) had extremely significant differences in the indicators such as number of emerged L. invasa,body mass of female adult,fecundity,longevity,etc.( 4) According to the fitness index( FI),the host plants of L. invasa were divided into 4 types by cluster analysis: suitable host,moderately suitable host,less suitable host and unsuitable host; the fecundity of each female was more than 70 eggs in suitable host,which was adequate to lead to potential population outbreak of the pest. host fitness index could be used as a comprehensive evaluation index for screening of resistant varieties( clones) in production.

关键词： Leptocybe invasa Fisher et La Salle Eucalyptus varieties host fitness Insect resistance

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