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Journal of Chemical Ecology

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https://www.readbyqxmd.com/read/28634722/three-novel-bile-alcohols-of-mature-male-sea-lamprey-petromyzon-marinus-act-as-chemical-cues-for-conspecifics
#1
Ke Li, Anne M Scott, Joseph J Riedy, Skye Fissette, Zoe E Middleton, Weiming Li
Sea lamprey, Petromyzon marinus, rely heavily on chemical cues that mediate their life history events, such as migration and reproduction. Here, we describe petromyzone A-C (1-3), three novel bile alcohols that are highly oxidized and sulfated, isolated from water conditioned with spermiated male sea lamprey. Structures of these compounds were unequivocally established by spectroscopic analyses and by comparison with spectra of known compounds. Electro-olfactogram recordings showed that 1 at 10(-11) M was stimulatory to the adult sea lamprey olfactory epithelium, while 2 and 3 were stimulatory at 10(-13) M...
June 20, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28620771/oviposition-preference-for-young-plants-by-the-large-cabbage-butterfly-pieris-brassicae-does-not-strongly-correlate-with-caterpillar-performance
#2
Minghui Fei, Jeffrey A Harvey, Yi Yin, Rieta Gols
The effects of temporal variation in the quality of short-lived annual plants on oviposition preference and larval performance of insect herbivores has thus far received little attention. This study examines the effects of plant age on female oviposition preference and offspring performance in the large cabbage white butterfly Pieris brassicae. Adult female butterflies lay variable clusters of eggs on the underside of short-lived annual species in the family Brassicaceae, including the short-lived annuals Brassica nigra and Sinapis arvensis, which are important food plants for P...
June 15, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28601940/the-male-produced-aggregation-pheromone-of-a-strawberry-sap-beetle-lobiopa-insularis-coleoptera-nitidulidae
#3
Antonioni A C Moliterno, Camila B C Martins, Daiane Szczerbowski, Maria Aparecida C Zawadneak, Paulo H G Zarbin
The nitidulid beetle Lobiopa insularis is an important pest of strawberry crops in the United States and Brazil. Both larvae and adults feed on ripe strawberries, causing 20-70% loss in production during serious infestations. Aiming at the development of efficient, clean, and highly specific pest management systems, semiochemicals, especially pheromones, are particularly useful. Analyses of the extracts of both males and females obtained from aeration of live beetles showed the presence of three male specific compounds, 2-nonanone, 2-undecanone, and 2-undecanol (in an enantiomeric ratio of S:R = 3...
June 10, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28601939/n-pentacosane-acts-as-both-contact-and-volatile-pheromone-in-the-tea-weevil-myllocerinus-aurolineatus
#4
Xiaoling Sun, Xinzhong Zhang, Guangyuan Wu, Xiwang Li, Fenngjing Liu, Zhaojun Xin, Jin Zhang
Insect cuticular hydrocarbons (CHCs) play important roles in chemical communication, as well as having ecological and physiological roles. The use of CHCs for mate recognition has been shown in many insect genera, but little is known about their use in the tea weevil Myllocerinus aurolineatus. Here, we provide evidence that CHCs on the surface of sexually mature M. aurolineatus females act as contact sex pheromones, facilitating mate recognition and eliciting copulatory behavior in male weevils. Using gas chromatography-mass spectrometry, we identify n-pentacosane and n-heptacosane as two potential contact pheromone components...
June 10, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28600687/carnivore-attractant-or-plant-elicitor-multifunctional-roles-of-methyl-salicylate-lures-in-tomato-defense
#5
Elizabeth Rowen, Michael Gutensohn, Natalia Dudareva, Ian Kaplan
Synthetic plant volatile lures attract natural enemies, but may have non-target effects due to the multifunctional nature of volatile signals. For example, methyl salicylate (MeSA) is used to attract predators, yet also serves as a signaling hormone involved in plant pathogen defense. We investigated the consequences of deploying MeSA lures to attract predators for tomato (Solanum lycopersicum) defense against herbivores. To understand the spatial distribution of the lure's effect, we exposed tomatoes in the field to MeSA along a linear distance gradient and induced defenses by simulating feeding by hornworm caterpillars in a fully crossed factorial design (+/- MeSA, +/- herbivory)...
June 9, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28589423/the-perennial-penstemon-variation-in-defensive-chemistry-across-years-populations-and-tissues
#6
Caitlin A Kelly, M Deane Bowers
Plants produce a variety of secondary metabolites that function as a defense against their natural enemies. Production of these secondary metabolites is genetically controlled, but is also phenotypically plastic and varies in response to both biotic and abiotic factors. Therefore, plant species may vary widely in their chemical defenses and such variation can be evident at temporal, spatial and tissue levels. Focusing on the chemical defenses of a native Colorado wildflower, Penstemon virgatus, we assessed the variation in iridoid glycoside (IG) content across two non-consecutive growing seasons, six natural populations and three tissue types: leaves, stems and flowers...
June 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28585091/a-generalist-herbivore-copes-with-specialized-plant-defence-the-effects-of-induction-and-feeding-by-helicoverpa-armigera-lepidoptera-noctuidae-larvae-on-intact-arabidopsis-thaliana-brassicales-plants
#7
M P Zalucki, J M Zalucki, L E Perkins, K Schramm, D G Vassão, J Gershenzon, D G Heckel
Plants of the Brassicaceae are defended from feeding by generalist insects by constitutively-expressed and herbivory-induced glucosinolates (GS). We induced Arabidopsis plants 1, 16 and 24 h prior to allowing neonate larvae of the generalist Helicoverpa armigera to feed on whole plants for 72 h. These plants were subsequently retested with another group of neonates for a further 72 h. We used wild-type A. thaliana Col-0, and mutant lines lacking indolic GS, aliphatic GS or all GS. We hypothesized that larvae would not grow well on defended plants (WT) compared to those lacking GS, and would not grow well if plants had been primed or fed on for longer, due to the expected induced GS...
June 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28536987/sexual-deception-in-the-eucera-pollinated-ophrys-leochroma-a-chemical-intermediate-between-wasp-and-andrena-pollinated-species
#8
Monica Cuervo, Demetra Rakosy, Carlos Martel, Stefan Schulz, Manfred Ayasse
Ophrys flowers mimic sex pheromones of attractive females of their pollinators and attract males, which attempt to copulate with the flower and thereby pollinate it. Virgin females and orchid flowers are known to use the same chemical compounds in order to attract males. The composition of the sex pheromone and its floral analogue, however, vary between pollinator genera. Wasp-pollinated Ophrys species attract their pollinators by using polar hydroxy acids, whereas Andrena-pollinated species use a mixture of non-polar hydrocarbons...
May 23, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28526946/evolutionary-ecology-of-multitrophic-interactions-between-plants-insect-herbivores-and-entomopathogens
#9
Ikkei Shikano
Plants play an important role in the interactions between insect herbivores and their pathogens. Since the seminal review by Cory and Hoover (2006) on plant-mediated effects on insect-pathogen interactions, considerable progress has been made in understanding the complexity of these tritrophic interactions. Increasing interest in the areas of nutritional and ecological immunology over the last decade have revealed that plant primary and secondary metabolites can influence the outcomes of insect-pathogen interactions by altering insect immune functioning and physical barriers to pathogen entry...
May 19, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28500569/comparison-of-the-chemical-compositions-of-the-cuticle-and-dufour-s-gland-of-two-solitary-bee-species-from-laboratory-and-field-conditions
#10
Theresa L Pitts-Singer, Marcia M Hagen, Bryan R Helm, Steven Highland, James S Buckner, William P Kemp
Species-specific biochemistry, morphology, and function of the Dufour's gland have been investigated for social bees and some non-social bee families. Most of the solitary bees previously examined are ground-nesting bees that use Dufour's gland secretions to line brood chambers. This study examines the chemistry of the cuticle and Dufour's gland of cavity-nesting Megachile rotundata and Osmia lignaria, which are species managed for crop pollination. Glandular and cuticular lipid compositions were characterized and compared to each other and according to the nesting experience of adult females...
May 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28500568/female-sex-pheromone-of-the-cone-moth-dioryctria-mendacella-investigation-of-synergism-between-type-i-and-type-ii-pheromone-components
#11
David R Hall, Dudley Farman, Juan C Domínguez, Juan A Pajares
Polyunsaturated hydrocarbons (Type II pheromone components) have been reported to be synergists for unsaturated acetates, alcohols or aldehydes (Type I components) in the sex pheromones of several species of Lepidoptera. However, there is some debate over whether the active components are the hydrocarbons themselves or more volatile degradation products. Extracts of pheromone glands of adult females of the cone moth, Dioryctria mendacella (Lepidoptera: Pyralidae), contain (Z,E)-9,11-tetradecadienyl acetate (ZE9,11-14:Ac) and at least ten times as much (Z,Z,Z,Z,Z)-3,6,9,12,15-pentacosapentaene (ZZZZZ3,6,9,12,15-25:H)...
May 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28478546/the-extended-community-level-effects-of-genetic-variation-in-foliar-wax-chemistry-in-the-forest-tree-eucalyptus-globulus
#12
Benjamin Gosney, Julianne O'Reilly-Wapstra, Lynne Forster, Carmen Whiteley, Brad Potts
Genetic variation in foundation trees can influence dependent communities, but little is known about the mechanisms driving these extended genetic effects. We studied the potential chemical drivers of genetic variation in the dependent foliar community of the focal tree Eucalyptus globulus. We focus on the role of cuticular waxes and compare the effects to that of the terpenes, a well-studied group of secondary compounds known to be bioactive in eucalypts. The canopy community was quantified based on the abundance of thirty-nine distinctive arthropod and fungal symptoms on foliar samples collected from canopies of 246 progeny from 13 E...
May 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28477139/caterpillar-induced-plant-volatiles-attract-adult-tortricidae
#13
D M Suckling, A M El-Sayed
Binary and ternary combinations of volatile organic compounds identified earlier from caterpillar-infested apple foliage caught more than one thousand individuals of both sexes of several adult tortricid leafroller species in several days of trials conducted in apple orchards in southern British Columbia. A series of combinations with phenylacetonitrile, benzyl alcohol, and/or 2-phenylethanol and acetic acid enabled substantial catches of both sexes of eye-spotted budmoth, Spilonota ocellana, oblique-banded leafroller, Choristoneura rosaceana and three-lined leafroller, Pandemis limitata...
May 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28466378/a-native-parasitic-plant-systemically-induces-resistance-in-jack-pine-to-a-fungal-symbiont-of-invasive-mountain-pine-beetle
#14
Jennifer G Klutsch, Ahmed Najar, Patrick Sherwood, Pierluigi Bonello, Nadir Erbilgin
Conifer trees resist pest and pathogen attacks by complex defense responses involving different classes of defense compounds. However, it is unknown whether prior infection by biotrophic pathogens can lead to subsequent resistance to necrotrophic pathogens in conifers. We used the infection of jack pine, Pinus banksiana, by a common biotrophic pathogen dwarf mistletoe, Arceuthobium americanum, to investigate induced resistance to a necrotrophic fungus, Grosmannia clavigera, associated with the mountain pine beetle, Dendroctonus ponderosae...
May 2, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28455797/the-fungus-raffaelea-lauricola-modifies-behavior-of-its-symbiont-and-vector-the-redbay-ambrosia-beetle-xyleborus-glabratus-by-altering-host-plant-volatile-production
#15
Xavier Martini, Marc A Hughes, Nabil Killiny, Justin George, Stephen L Lapointe, Jason A Smith, Lukasz L Stelinski
The redbay ambrosia beetle Xyleborus glabratus is the vector of the symbiotic fungus, Raffaelea lauricola that causes laurel wilt, a highly lethal disease to members of the Lauraceae family. Pioneer X. glabratus beetles infect live trees with R. lauricola, and only when tree health starts declining more X. glabratus are attracted to the infected tree. Until now this sequence of events was not well understood. In this study, we investigated the temporal patterns of host volatiles and phytohormone production and vector attraction in relation to laurel wilt symptomology...
April 28, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28455796/effect-of-brood-pheromone-on-survival-and-nutrient-intake-of-african-honey-bees-apis-mellifera-scutellata-under-controlled-conditions
#16
Fabien J Démares, Abdullahi A Yusuf, Susan W Nicolson, Christian W W Pirk
The influence of pheromones on insect physiology and behavior has been thoroughly reported for numerous aspects, such as attraction, gland development, aggregation, mate and kin recognition. Brood pheromone (BP) is released by honey bee larvae to indicate their protein requirements to the colony. Although BP is known to modulate pollen and protein consumption, which in turn can affect physiological and morphological parameters, such as hypopharyngeal gland (HPG) development and ovarian activation, few studies have focused on the effect of BP on nutritional balance...
April 28, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28405915/does-aphid-infestation-interfere-with-indirect-plant-defense-against-lepidopteran-caterpillars-in-wild-cabbage
#17
Yehua Li, Berhane T Weldegergis, Surachet Chamontri, Marcel Dicke, Rieta Gols
Attraction of parasitoids to plant volatiles induced by multiple herbivory depends on the specific combinations of attacking herbivore species, especially when their feeding modes activate different defense signalling pathways as has been reported for phloem feeding aphids and tissue feeding caterpillars. We studied the effects of pre-infestation with non-host aphids (Brevicoryne brassicae) for two different time periods on the ability of two parasitoid species to discriminate between volatiles emitted by plants infested by host caterpillars alone and those emitted by plants infested with host caterpillars plus aphids...
April 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28393296/localization-of-defensive-chemicals-in-two-congeneric-butterflies-euphydryas-nymphalidae
#18
Peri A Mason, M Deane Bowers
Many insect species sequester compounds acquired from their host plants for defense against natural enemies. The distribution of these compounds is likely to affect both their efficacy as defenses, and their costs. In this study we examined the distribution of sequestered iridoid glycosides (IGs) in two congeneric species of nymphalid butterfly, Euphydryas anicia and E. phaeton, and found that the pattern of localization of IGs differed between the two species. Although IG concentrations were quite high in the heads of both species, the relative concentrations in wings and abdomens differed substantially...
April 10, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28386801/diploid-male-production-results-in-queen-death-in-the-stingless-bee-scaptotrigona-depilis
#19
Ayrton Vollet-Neto, Ricardo C Oliveira, Sharon Schillewaert, Denise A Alves, Tom Wenseleers, Fabio S Nascimento, Vera L Imperatriz-Fonseca, Francis L W Ratnieks
As in most Hymenoptera, the eusocial stingless bees (Meliponini) have a complementary sex determination (CSD) system. When a queen makes a "matched mating" with a male that shares a CSD allele with her, half of their diploid offspring are diploid males rather than females. Matched mating imposes a cost, since diploid male production reduces the colony workforce. Hence, adaptations preventing the occurrence or attenuating its effects are likely to arise. Here we provide clear evidence that in the stingless bee Scaptotrigona depilis, the emergence of diploid males induces queen death, and this usually occurs within 10-20 days of the emergence of diploid male offspring from their pupae...
April 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28386800/chemical-ecology-of-stingless-bees
#20
Sara Diana Leonhardt
Stingless bees (Hymenoptera, Apidae: Meliponini) represent a highly diverse group of social bees confined to the world's tropics and subtropics. They show a striking diversity of structural and behavioral adaptations and are important pollinators of tropical plants. Despite their diversity and functional importance, their ecology, and especially chemical ecology, has received relatively little attention, particularly compared to their relative the honeybee, Apis mellifera. Here, I review various aspects of the chemical ecology of stingless bees, from communication over resource allocation to defense...
April 6, 2017: Journal of Chemical Ecology
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