Action of Douglas Fir Tussock Moth Larvae and Their Microflora on Dietary Terpenes

Andrews, Robert E.; Spence, Kemet D.

doi:10.1128/aem.40.5.959-963.1980

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Experiments aimed at testing a role of gut fungi in breakdown of caffeine in the coffee berry borer Hypothenemus hampei (Coleoptera: Curculionidae) produced negative results, as the isolated fungi were inhibited themselves by caffeine (Vega et al 2003). Earlier experiments on degradation of dietary terpenes in the Douglas-fir tussock moth, Orgyia pseudotsugata, weighed against a regular role of gut bacteria (Andrews & Spence 1980). A similar proposal has been made for gypsy moths: their gut communities sometimes contain Rhodococcus strains, some of which are known to break down plant-derived monoterpene toxins (Broderick et al 2004).…”

Section: Box 1 Is Host Plant Specificity Driven By Symbionts In Aphids?mentioning

confidence: 99%

“…). Earlier experiments on degradation of dietary terpenes in the Douglas‐fir tussock moth, Orgyia pseudotsugata , weighed against a regular role of gut bacteria (Andrews & Spence ). A similar proposal has been made for gypsy moths: their gut communities sometimes contain Rhodococcus strains, some of which are known to break down plant‐derived monoterpene toxins (Broderick et al .…”

Section: Gut Symbiontsmentioning

confidence: 99%

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The impact of microbial symbionts on host plant utilization by herbivorous insects

2013

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Herbivory, defined as feeding on live plant tissues, is characteristic of highly successful and diverse groups of insects and represents an evolutionarily derived mode of feeding. Plants present various nutritional and defensive barriers against herbivory; nevertheless, insects have evolved a diverse array of mechanisms that enable them to feed and develop on live plant tissues. For decades, it has been suggested that insect-associated microbes may facilitate host plant use, and new molecular methodologies offer the possibility to elucidate such roles. Based on genomic data, specialized feeding on phloem and xylem sap is highly dependent on nutrient provisioning by intracellular symbionts, as exemplified by Buchnera in aphids, although it is unclear whether such symbionts play a substantive role in host plant specificity of their hosts. Microorganisms present in the gut or outside the insect body could provide more functions including digestion of plant polymers and detoxification of plant-produced toxins. However, the extent of such contributions to insect herbivory remains unclear. We propose that the potential functions of microbial symbionts in facilitating or restricting the use of host plants are constrained by their location (intracellular, gut or environmental), and by the fidelity of their associations with insect host lineages. Studies in the next decade, using molecular methods from environmental microbiology and genomics, will provide a more comprehensive picture of the role of microbial symbionts in insect herbivory.

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Section: Box 1 Is Host Plant Specificity Driven By Symbionts In Aphids?mentioning

confidence: 99%

Section: Gut Symbiontsmentioning

confidence: 99%

The impact of microbial symbionts on host plant utilization by herbivorous insects

2013

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Gut microbes may facilitate insect herbivory of chemically defended plants

2015

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The majority of insect species consume plants, many of which produce chemical toxins that defend their tissues from attack. How then are herbivorous insects able to develop on a potentially poisonous diet? While numerous studies have focused on the biochemical counter-adaptations to plant toxins rooted in the insect genome, a separate body of research has recently emphasized the role of microbial symbionts, particularly those inhabiting the gut, in plant-insect interactions. Here we outline the "gut microbial facilitation hypothesis," which proposes that variation among herbivores in their ability to consume chemically defended plants can be due, in part, to variation in their associated microbial communities. More specifically, different microbes may be differentially able to detoxify compounds toxic to the insect, or be differentially resistant to the potential antimicrobial effects of some compounds. Studies directly addressing this hypothesis are relatively few, but microbe-plant allelochemical interactions have been frequently documented from non-insect systems-such as soil and the human gut-and thus illustrate their potential importance for insect herbivory. We discuss the implications of this hypothesis for insect diversification and coevolution with plants; for example, evolutionary transitions to host plant groups with novel allelochemicals could be initiated by heritable changes to the insect microbiome. Furthermore, the ecological implications extend beyond the plant and insect herbivore to higher trophic levels. Although the hidden nature of microbes and plant allelochemicals make their interactions difficult to detect, recent molecular and experimental techniques should enable research on this neglected, but likely important, aspect of insect-plant biology.

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Biochemical and taxonomic characterization of bacteria associated with the crucifer root maggot (Delia radicum)

Lukwinski¹,

Hill²,

Khachatourians³

et al. 2006

Can. J. Microbiol.

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The crucifer root maggot, Delia radicum, is an important pest of cruciferous crops; however, little is known about its digestive biochemistry or resident gut microbiota. A culturing approach was used to survey the types of micro organisms associated with eggs, midgut, and faeces of larvae feeding on rutabaga. All bacteria isolated from the midgut and faecal materials were Gram-negative bacilli. Nine types of culturable bacteria were identified within the midgut based on analysis of 60 kDa chaperonin sequences and were generally gamma-Proteobacteria, primarily Enterobacteriaceae. Carbohydrate utilization patterns, select biochemical pathways, and hydrolytic enzymes were examined using the API(R) system for each of the nine groups, revealing an exceptionally broad metabolic and hydrolytic potential. These studies suggest that resident alimentary tract microorganisms have the potential to contribute to host nutrition directly as a food source as well as by providing increased digestive potential.

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Action of Douglas Fir Tussock Moth Larvae and Their Microflora on Dietary Terpenes

Cited by 3 publications

References 11 publications

The impact of microbial symbionts on host plant utilization by herbivorous insects

The impact of microbial symbionts on host plant utilization by herbivorous insects

Gut microbes may facilitate insect herbivory of chemically defended plants

Biochemical and taxonomic characterization of bacteria associated with the crucifer root maggot (Delia radicum)

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