Suppressants of Gut Bacteria in the Boll Weevil from the Cotton Plant12

Hedin, P. A.; Lindig, O. H.; Sikorowski, P. P.; Wyatt, Michael G.

doi:10.1093/jee/71.3.394

Cited by 18 publications

(4 citation statements)

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“…26 Similarly, in a bioassay study with the generalist Spodoptera exigua. β-caryophyllene had a highly significant effect on mortality, 27 correlates with reduction in the level of lepidopteran herbivory in several populations of the tropical leguminous tree Hymenaea stigonocarpa 28 and attracts adult predatory green lacewings, Chrysopa carnea, 29 while Bernhad Weissbecker et al 30 demonstrated that the two-spotted predaceous stinkbug, Perillus bioculatus, was attracted towards the sesquiterpenes β-caryophyllene, germacrene D, bicyclogermacrene and α-humulene in volatiles released from damaged potato plant by Colorado potato beetle. By separating apolar terpenoid hydrocarbons from more polar compounds using column chromatography on silica, Wegener et al 31 showed that a volatile blend containing α-elemene, δ-cadinene, α-humulene, germacrene D and (E,E)-α-farnesene, emitted in jasmonate-induced elm leaves, was exploited by the specialist parasitoid Oomyzus gallerucae in locating its host, the elm leaf beetle Xanthogaleruca luteola.…”

Section: Resultsmentioning

confidence: 99%

Chemical composition of the essential oils of Lantana camara L. occurring in south China

Sundufu

Shoushan

2004

Flavour & Fragrance J

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Steam-distilled volatile oils from the leaves and flowers of Lantana camara L. were analysed by GC and GC-MS. The oils are characterized by a high percentage of sesquiterpenes. The main components detected are germacrene D (15.85%), β-caryophyllene (12.35%), α-humulene (9.31%) and germacrene-B (6.19%). 1,8-Cineole (4.61%), an oxygenated monoterpene is also reported. Experimental Plant Material and Extraction of VolatilesAerial parts of L. camara were collected from the campus of South China Agricultural University, Guangzhou, People's Republic of China, in August-September. Fresh leaves, flowers and thin branches were cut into 1-2 cm pieces, air-dried for 7 days at room temperature and steam-distilled for 5 h furnishing 0.13-0.2% (v/w) oils. The oils were dried over anhydrous Na 2 SO 4 and kept refrigerated until used. Analysis of the Essential OilsComponents of the volatile oil were separated on a Finnigan TRACE 2000 GC-MS instrument (FinniganSpectronex, USA), equipped with two fused-silica column (30 mm × 0.25 mm i.d.), coated with DB-1 (df = 0.25 µm); temperature programme, from 60°C (for 2 min) to 80°C at 3°C/min; 80-120°C at 6°C/min (held 0 min); 120-140°C at 3°C/min (held 0 min); then to 230°C at 10°C/min (held 0 min) and later, 240°C (held 1 min); injector temperature, 220°C; ion source temperature, 200°C; EI, 70 eV; carrier gas, He, 1 ml/min; injection volume, l µl; split, 1:20; mass range, 35-450 amu.

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Section: Resultsmentioning

confidence: 99%

Chemical composition of the essential oils of Lantana camara L. occurring in south China

Sundufu

Shoushan

2004

Flavour & Fragrance J

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“…were also reported as the most abundant genera in the weevil Rhynchoporus ferrugines olivers (Tagliavia et al, 2014; Montagna et al, 2015). The eleven OTUs mentioned above are members of families already reported in insect microbiomes (Hedin et al, 1978; Campbell et al, 1992; Priya et al, 2012; Prabhakar et al, 2013; Montagna et al, 2015; Xu et al, 2015; Franzini et al, 2016). …”

Section: Discussionmentioning

confidence: 96%

“…In A. grandis , most studies have focused on bio-control strategies but their microbiota has been poorly assessed (Sikorowski, 1975; Hedin et al, 1978; Firmino et al, 2013; Salvador et al, 2014). …”

Section: Introductionmentioning

confidence: 99%

Effect of Different Lignocellulosic Diets on Bacterial Microbiota and Hydrolytic Enzyme Activities in the Gut of the Cotton Boll Weevil (Anthonomus grandis)

et al. 2016

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Cotton boll weevils, Anthonomus grandis, are omnivorous coleopteran that can feed on diets with different compositions, including recalcitrant lignocellulosic materials. We characterized the changes in the prokaryotic community structure and the hydrolytic activities of A. grandis larvae fed on different lignocellulosic diets. A. grandis larvae were fed on three different artificial diets: cottonseed meal (CM), Napier grass (NG) and corn stover (CS). Total DNA was extracted from the gut samples for amplification and sequencing of the V3-V4 hypervariable region of the 16S rRNA gene. Proteobacteria and Firmicutes dominated the gut microbiota followed by Actinobacteria, Spirochaetes and a small number of unclassified phyla in CM and NG microbiomes. In the CS feeding group, members of Spirochaetes were the most prevalent, followed by Proteobacteria and Firmicutes. Bray–Curtis distances showed that the samples from the CS community were clearly separated from those samples of the CM and NG diets. Gut extracts from all three diets exhibited endoglucanase, xylanase, β-glucosidase and pectinase activities. These activities were significantly affected by pH and temperature across different diets. We observed that the larvae reared on a CM showed significantly higher activities than larvae reared on NG and CS. We demonstrated that the intestinal bacterial community structure varies depending on diet composition. Diets with more variable and complex compositions, such as CS, showed higher bacterial diversity and richness than the two other diets. In spite of the detected changes in composition and diversity, we identified a core microbiome shared between the three different lignocellulosic diets. These results suggest that feeding with diets of different lignocellulosic composition could be a viable strategy to discover variants of hemicellulose and cellulose breakdown systems.

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“…In other cases, the delivery of toxic protein via plant tissues will increase the mortality rate for herbivores compared to that experienced when anti-bacterial secondary compounds fed upon by the herbivore inhibit toxin production in the gut (Reichelderfer, 1991). Hedin et al (1978) found that cotton extracts suppressed the growth of B. thuringiensis.…”

Section: Susceptibility Of Lepidopteran Species To Bt Toxinsmentioning

confidence: 99%

Btcrops: Predicting effects of escaped transgenes on the fitness of wild plants and their herbivores

Letourneau

Robinson

Hagen

2003

Environ. Biosafety Res.

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One prominent concern about genetically modified crops is the possibility of environmental impacts from the movement of fitness-enhancing traits to wild plant populations. Decisions to deregulate Bt crops in the USA have relied strongly on arguments that these crops will not interbreed with wild relatives in the permitted growing regions. Limited attention therefore has been directed to analyses of the consequences of gene flow. To provide a transparent evaluation process for risks associated with insecticidal transgene escape, we crafted a series of questions designed to guide this aspect of the risk assessment. We then explored the current knowledge base available for answering such risk-related questions for three Bt crops (cotton, rapeseed, and rice). First, we generated a list of wild relatives of these crops. A definitive list of potential transgene recipients is not yet possible for some crops. Sufficient data are not available for some crops to eliminate certain related plant species from consideration of fertile hybrid formation, thus making lists for these crops subject to speculation. Second, we queried the HOSTS database (UK) to obtain a worldwide listing of lepidopteran species that feed on these crops and their wild relatives, and to determine the host range of the larvae. To our knowledge, this list of 502 lepidopteran species is the first such list published for these crops and wild crop relatives. Third, we used a data set maintained by the Canadian Forest Service to assess Bt toxin susceptibility for these lepidopterans. Only 3% of those species have been tested for susceptibility; and the literature suggests that generalizations about susceptibility among taxa are difficult due to the variability within families. Fourth, we consulted the literature to interpret what is known about the ability of lepidopterans to regulate plant fitness or invasiveness. We could not eliminate the possibility of ecological release due to plant resistance against lepidopterans. In fact, there is strong experimental evidence that lepidopteran herbivores do limit the distribution and/or abundances of at least some wild plant species. Neither could we eliminate the possibility that non-target lepidopterans might have important functions in the ecosystem as pollinators or alternate hosts to natural enemies of pest species. This study suggests that crucial data are lacking for the development of a credible scientific basis to confirm or deny environmental risks associated with the escape of Bt transgene constructs to wild relatives. Given the absence of information on the identity, level of susceptibility, and ecological roles of lepidopterans exploiting specific wild relatives of Bt crops, we suggest that new efforts be directed to assessing possible consequences of lepidopteran mortality on resistant wild relatives.

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Suppressants of Gut Bacteria in the Boll Weevil from the Cotton Plant12

Cited by 18 publications

References 0 publications

Chemical composition of the essential oils of Lantana camara L. occurring in south China

Chemical composition of the essential oils of Lantana camara L. occurring in south China

Effect of Different Lignocellulosic Diets on Bacterial Microbiota and Hydrolytic Enzyme Activities in the Gut of the Cotton Boll Weevil (Anthonomus grandis)

Btcrops: Predicting effects of escaped transgenes on the fitness of wild plants and their herbivores

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