Visual Detection and Avoidance of Pathogenic Bacteria by Aphids

Hendry, Tory A.; Ligon, Russell A.; Besler, Kevin; Fay, Rachel L.; Smee, Melanie R.

doi:10.1016/j.cub.2018.07.073

Cited by 22 publications

(36 citation statements)

References 39 publications

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“…insects can detect pathogens and avoid them [7], it remains unclear whether social insects can reliably detect pathogens at a potential nesting site and avoid them. Queens of wood ant were attracted to fungal pathogens during the initial stage of colony founding [8].…”

Section: Plos Pathogensmentioning

confidence: 99%

“…In particular, for social insects that nest in soil, pathogens are a significant danger that varies greatly from place to place [ 3 – 6 ]. Though some insects can detect pathogens and avoid them [ 7 ], it remains unclear whether social insects can reliably detect pathogens at a potential nesting site and avoid them. Queens of wood ant were attracted to fungal pathogens during the initial stage of colony founding [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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The nesting preference of an invasive ant is associated with the cues produced by actinobacteria in soil

et al. 2020

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Soil-dwelling animals are at risk of pathogen infection in soils. When choosing nesting sites, animals could reduce this risk by avoiding contact with pathogens, yet there is currently little evidence. We tested this hypothesis using Solenopsis invicta as a model system. Newly mated queens of S. invicta were found to nest preferentially in soil containing more actinobacteria of Streptomyces and Nocardiopsis and to be attracted to two volatiles produced by these bacteria, geosmin and 2-methylisoborneol. Actinobacteria-rich soil was favored by S. invicta and this soil contained fewer putative entomopathogenic fungi than adjacent areas. Queens in such soil benefited from a higher survival rate. In culture, isolated actinobacteria inhibited entomopathogenic fungi, suggested that their presence may reduce the risk of fungal infection. These results indicated a soil-dwelling ant may choose nest sites presenting relatively low pathogen risk by detecting the odors produced by bacteria with anti-fungal properties.

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Section: Plos Pathogensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The nesting preference of an invasive ant is associated with the cues produced by actinobacteria in soil

et al. 2020

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“…Previous studies have shown that aphids can become infected from epiphytic bacteria on leaf 189 surfaces (Stavrinides et al 2009;Hendry et al 2018). Consequently, we hypothesized that the 190 mortality of aphids feeding on epiphytically infected plants should be similar to that which we see 191 when feeding bacteria suspended in artificial diet to aphids, yet likely take longer to achieve as 192 aphids would be less likely to become rapidly or heavily infected.…”

Section: Impact Of Aphid Presence On Plants 164mentioning

confidence: 99%

Insects as phyllosphere microbiome engineers: effects of aphids on a plant pathogen

Smee

Real-Ramírez

Hendry

2019

Preprint

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Insect herbivores are common in the phyllosphere, the above-ground parts of plants, and encounter diverse plant-associated bacteria there, yet how these organisms interact remains largely unknown. Strains of the bacterium Pseudomonas syringae grow well epiphytically and have been shown to grow within and kill hemipteran insects like the pea aphid, Acyrthosiphon pisum. Aphids are hypothesized to be an alternative host for these epiphytic bacteria but it is unclear if aphids provide fitness benefits to these bacterial pathogens. To determine if epiphytic bacteria could be adapted for infecting aphids, we characterized 21 strains of P. syringae for epiphytic ability and virulence to pea aphids and found that the two traits were positively correlated. For a subset of strains, we tested if the bacteria derived a fitness benefit from the presence of aphids. Some strains benefited significantly, with up to 18.9% higher population densities when aphids were present, and lower starting population density was predictive of higher benefit from aphid presence. However, further investigation found that honeydew, the sugary waste product of aphids, and not growth in aphids, increased P. syringae growth on leaves. This suggests that aphids may be important microbiome engineers in the phyllosphere, but evolutionarily dead-ends for epiphytic bacteria.

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“…Along with chemical contributions to floral phenotype, microbes can modify the visual characteristics of flowers directly (e.g. potentially as a result of pigment production or fluorescence from bacterial pyoverdine; Hendry et al ., ) or indirectly (e.g. by inducing changes in petal colors or their longevity; Engelhard, ; Jennersten, ).…”

Section: Floral Extended Phenotypementioning

confidence: 99%

Gazing into the anthosphere: considering how microbes influence floral evolution

Rebolleda‐Gómez

Forrester²,

Russell³

et al. 2019

New Phytologist

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Summary The flower is the hallmark of angiosperms and its evolution is key to their diversification. As knowledge of ecological interactions between flowers and their microbial communities (the anthosphere) expands, it becomes increasingly important to consider the evolutionary impacts of these associations and their potential eco‐evolutionary dynamics. In this Viewpoint we synthesize current knowledge of the anthosphere within a multilevel selection framework and illustrate the potential for the extended floral phenotype (the phenotype expressed from the genes of the plant and its associated flower microbes) to evolve. We argue that flower microbes are an important, but understudied, axis of variation that shape floral trait evolution and angiosperm reproductive ecology. We highlight knowledge gaps and discuss approaches that are critical for gaining a deeper understanding of the role microbes play in mediating plant reproduction, ecology, and evolution.

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Visual Detection and Avoidance of Pathogenic Bacteria by Aphids

Abstract: Highlights d Pea aphids avoid feeding on leaves with pathogenic bacteria on their surface d Pea aphids use vision in the presence of ultraviolet light to avoid pathogenic bacteria d Avoidance is mediated by visual detection of fluorescence from bacterial pyoverdine

Cited by 22 publications

References 39 publications

The nesting preference of an invasive ant is associated with the cues produced by actinobacteria in soil

The nesting preference of an invasive ant is associated with the cues produced by actinobacteria in soil

Insects as phyllosphere microbiome engineers: effects of aphids on a plant pathogen

Gazing into the anthosphere: considering how microbes influence floral evolution

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