Journal ArticleDOI
Facultative Symbionts in Aphids and the Horizontal Transfer of Ecologically Important Traits
TLDR
Experiments on pea aphids have demonstrated that facultative symbionts protect against entomopathogenic fungi and parasitoid wasps, ameliorate the detrimental effects of heat, and influence host plant suitability.Abstract:
Aphids engage in symbiotic associations with a diverse assemblage of heritable bacteria. In addition to their obligate nutrient-provisioning symbiont, Buchnera aphidicola, aphids may also carry one or more facultative symbionts. Unlike obligate symbionts, facultative symbionts are not generally required for survival or reproduction and can invade novel hosts, based on both phylogenetic analyses and transfection experiments. Facultative symbionts are mutualistic in the context of various ecological interactions. Experiments on pea aphids (Acyrthosiphon pisum) have demonstrated that facultative symbionts protect against entomopathogenic fungi and parasitoid wasps, ameliorate the detrimental effects of heat, and influence host plant suitability. The protective symbiont, Hamiltonella defensa, has a dynamic genome, exhibiting evidence of recombination, phage-mediated gene uptake, and horizontal gene transfer and containing virulence and toxin-encoding genes. Although transmitted maternally with high fidelity, facultative symbionts occasionally move horizontally within and between species, resulting in the instantaneous acquisition of ecologically important traits, such as parasitoid defense.read more
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Journal ArticleDOI
Microbiome diversity of Aphis glycines with extensive superinfection in native and invasive populations
TL;DR: Divergent selection pressures among natural and laboratory populations were inferred as factors driving the differential bacterial communities observed and will allow for improved comparative aphid-symbiont research and broaden the understanding of the interactions among insects, endosymbionts and their environments.
Journal ArticleDOI
The Crypt-Dwelling Primary Bacterial Symbiont of the Polyphagous Pentatomid Pest Halyomorpha halys (Hemiptera: Pentatomidae)
TL;DR: Investigation of H. halys primary symbiont in DNA extracted from eggs suggested vertical maternal inheritance as the mode of intergenerational transmission and an intimate association between these two organisms.
Journal ArticleDOI
Bacterial communities of the cotton aphid Aphis gossypii associated with Bt cotton in northern China.
TL;DR: The bacterial diversity of the cotton aphid Aphis gossypii associated with Bt cotton in northern China is investigated by targeting the V4 region of the 16S rDNA using the Illumina MiSeq platform, and the first report documenting the facultative symbiont Hamiltonella in A. gOSSypii is documented.
Journal ArticleDOI
From microbiology to cell biology: when an intracellular bacterium becomes part of its host cell.
TL;DR: Understanding these bacteria will require inspiration from eukaryotic cell biology, because a traditional microbiological framework is insufficient for understanding how they work.
Journal ArticleDOI
Multi-scale characterization of symbiont diversity in the pea aphid complex through metagenomic approaches.
Cervin Guyomar,Fabrice Legeai,Emmanuelle Jousselin,Christophe Mougel,Claire Lemaitre,Jean-Christophe Simon +5 more
TL;DR: The pea aphid holobiont is a model system for the study of insect-bacteria symbiosis, which can take several forms, from mutualism to parasitism.
References
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Book
Parasitoids: Behavioral and Evolutionary Ecology
TL;DR: This book synthesizes the work of both schools of parasitoid biology and asks how a consideration of evolutionary biology can help to understand the behavior, ecology, and diversity of the approximately one to two million species of Parasitoids found on earth.
Journal ArticleDOI
Genomics and Evolution of Heritable Bacterial Symbionts
TL;DR: Insect heritable symbionts provide some of the extremes of cellular genomes, including the smallest and the fastest evolving, raising new questions about the limits of evolution of life.
Book
Evolution of sex determining mechanisms
TL;DR: Books, as a source that may involve the facts, opinion, literature, religion, and many others are the great friends to join with.
Journal ArticleDOI
Type III Secretion Machines: Bacterial Devices for Protein Delivery into Host Cells
Jorge E. Galán,Alan Collmer +1 more
TL;DR: Several Gram-negative pathogenic bacteria have evolved a complex protein secretion system termed type III to deliver bacterial effector proteins into host cells that then modulate host cellular functions.