Tritrophic Interactions: Microbe-Mediated Plant Effects on Insect Herbivores

Shikano, Ikkei; Rosa, Cristina; Tan, Ching Wen; Felton, Gary W.

doi:10.1146/annurev-phyto-080516-035319

Cited by 187 publications

(149 citation statements)

References 151 publications

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“…It is known that koinobiont endoparasitoids (such as C. glomerata, C. rubecula and H. ebeninus ) affect physiology and metabolism of their herbivore hosts in ways that benefit the parasitoid offspring (Pennacchio and Strand 2006). Evidence is accumulating that host regulation not only affects the caterpillar host but also extends to the herbivore food plant via alterations of the oral secretions of parasitized caterpillars (Poelman et al 2011; Kaplan et al 2016; Shikano et al 2017; Mason et al 2018). As a conclusion, parasitism can override herbivore identity in terms of plant defense responses and HIPV emission.…”

Section: Discussionmentioning

confidence: 99%

Hyperparasitoids exploit herbivore-induced plant volatiles during host location to assess host quality and non-host identity

et al. 2019

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Although consumers often rely on chemical information to optimize their foraging strategies, it is poorly understood how top carnivores above the third trophic level find resources in heterogeneous environments. Hyperparasitoids are a common group of organisms in the fourth trophic level that lay their eggs in or on the body of other parasitoid hosts. Such top carnivores use herbivore-induced plant volatiles (HIPVs) to find caterpillars containing parasitoid host larvae. Hyperparasitoids forage in complex environments where hosts of different quality may be present alongside non-host parasitoid species, each of which can develop in multiple herbivore species. Because both the identity of the herbivore species and its parasitization status can affect the composition of HIPV emission, hyperparasitoids encounter considerable variation in HIPVs during host location. Here, we combined laboratory and field experiments to investigate the role of HIPVs in host selection of hyperparasitoids that search for hosts in a multi-parasitoid multi-herbivore context. In a wild Brassica oleracea-based food web, the hyperparasitoid Lysibia nana preferred HIPVs emitted in response to caterpillars parasitized by the gregarious host Cotesia glomerata over the non-host Hyposoter ebeninus. However, no plant-mediated discrimination occurred between the solitary host C. rubecula and the non-host H. ebeninus. Under both laboratory and field conditions, hyperparasitoid responses were not affected by the herbivore species (Pieris brassicae or P. rapae) in which the three primary parasitoid species developed. Our study shows that HIPVs are an important source of information within multitrophic interaction networks allowing hyperparasitoids to find their preferred hosts in heterogeneous environments.Electronic supplementary materialThe online version of this article (10.1007/s00442-019-04352-w) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Hyperparasitoids exploit herbivore-induced plant volatiles during host location to assess host quality and non-host identity

et al. 2019

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“…This will allow for a better understanding of the evolutionary dynamics of insectplant interactions, and further our knowledge on how genetic differentiation accumulates throughout the genome over the course of the speciation process (Nosil et al, 2017). Evolutionary genomics of insect-plant interactions should, thus, explicitly consider the diversity, dynamics, and roles of microbial communities associated with insects and their host plants, as their contribution to insect adaptation and diversification has been largely ignored (Kaiser et al, 2010;Gutzwiller et al, 2015;Sugio et al, 2015;Giron et al, 2017;Shikano et al, 2017). Herbivorous insects host microbial communities and there is growing evidence that they expand the insect's ability to exploit plants and modulate plant primary and secondary metabolisms and/or defences against parasites.…”

Section: Future Promises and Challengesmentioning

confidence: 99%

Promises and challenges in insect–plant interactions

Giron

Dubreuil

Bennett

et al. 2018

Entomologia Exp Applicata

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There is tremendous diversity of interactions between plants and other species. These relationships range from antagonism to mutualism. Interactions of plants with members of their ecological community can lead to a profound metabolic reconfiguration of the plants' physiology. This reconfiguration can favour beneficial organisms and deter antagonists like pathogens or herbivores. Determining the cellular and molecular dialogue between plants, microbes, and insects, and its ecological and evolutionary implications is important for understanding the options for each partner to adopt an adaptive response to its biotic environment. Moving forward, understanding how such ecological interactions are shaped by environmental change and how we potentially mitigate deleterious effects will be increasingly important. The development of integrative multidisciplinary approaches may provide new solutions to the major ecological and societal issues ahead of us. The rapid evolution of technology provides valuable tools and opens up novel ways to test hypotheses that were previously unanswerable, but requires that scientists master these tools, understand potential ethical problems flowing from their implementation, and train new generations of biologists with diverse technical skills. Here, we provide brief perspectives and discuss future promise and challenges for research on insect-plant interactions building on the 16th International Symposium on Insect-Plant interactions (SIP) meeting that was held in Tours, France (2-6 July 2017). Talks, posters, and discussions are distilled into key research areas in insect-plant interactions, highlighting the current state of the field and major challenges, and future directions for both applied and basic research.

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“…This prevents the growth inhibition that would normally follow from a variety of both biotic and abiotic impediments (Glick, 1995;Glick et al, 1998;Santoyo et al, 2016). Phytohormones are also used by plants to reduce damage from insect feeding (Shikano et al, 2017).…”

Section: Hypothesis 5: Microbial Diversity Will Increase Overall Planmentioning

confidence: 99%

The Green Roof Microbiome: Improving Plant Survival for Ecosystem Service Delivery

et al. 2018

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Plants are key contributors to ecosystem services delivered by green roofs in cities including stormwater capture, temperature regulation, and wildlife habitat. As a result, current research has primarily focused on their growth in relationship to extensive green roof (e.g., substrates <15 cm depth) ecosystem services. Green roofs are exposed to a variety of harsh abiotic factors such as intense solar radiation, wind, and isolation from ground-level habitats, making survival exceedingly difficult. Plants in natural habitats benefit from a variety of interactions with fungi and bacteria. These plant-microbial interactions improve mechanisms of survival and productivity; however, many green roof substrates are sterilized prior to installation and lack microbial communities with unstudied consequences for green roof plant health and subsequent survival and performance. In this paper, we present six hypotheses on the positive role of microbes in green roof applications. In natural and experimental systems, microbial interactions have been linked to plant (1) drought tolerance, (2) pathogen protection, (3) nutrient availability, (4) salt tolerance, (5) phytohormone production, and (6) substrate stabilization, all of which are desirable properties of green roof ecosystems. As few studies exist that directly examine these relationships on green roofs, we explore the existing ecological literature on these topics to unravel the mechanisms that could support more complex green roof ecosystem and lead to new insight into the design, performance, and broader applications in green infrastructure.

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Tritrophic Interactions: Microbe-Mediated Plant Effects on Insect Herbivores

Cited by 187 publications

References 151 publications

Hyperparasitoids exploit herbivore-induced plant volatiles during host location to assess host quality and non-host identity

Hyperparasitoids exploit herbivore-induced plant volatiles during host location to assess host quality and non-host identity

Promises and challenges in insect–plant interactions

The Green Roof Microbiome: Improving Plant Survival for Ecosystem Service Delivery

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