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Journal of Chemical Ecology | Page 2

Qinjian Pan, Ikkei Shikano, Kelli Hoover, Tong-Xian Liu, Gary W Felton
Although the tritrophic interactions of plants, insect herbivores and their natural enemies have been intensely studied for several decades, the roles of entomopathogens in their indirect modulation of plant-insect relationships is still unclear. Here, we employed a sublethal dose of a baculovirus with a relatively broad host range (AcMNPV) to explore if feeding by baculovirus-challenged Helicoverpa zea caterpillars induces direct defenses in the tomato plant. We examined induction of plant defenses following feeding by H...
May 25, 2019: Journal of Chemical Ecology
Katharina Brandt, Stefan Dötterl, Roman Fuchs, Daniela Maria do Amaral Ferraz Navarro, Isabel Cristina Sobreira Machado, Daniel Dobler, Oliver Reiser, Manfred Ayasse, Paulo Milet-Pinheiro
Different enantiomers of chiral compounds within floral perfumes usually trigger distinct responses in insects; however, this has frequently been neglected in studies investigating semiochemicals in plant-pollinator interactions. Approximately 1000 neotropical plants produce floral perfumes as the only reward for pollinators, i.e. male euglossine bees. The chiral compound carvone epoxide is a key component of the scent bouquet of many perfume-rewarding plants that are pollinated by males of Eulaema. Here, we tested the biological activity of the four carvone epoxide stereoisomers to four Eulaema species occurring in the Atlantic Rainforest of NE-Brazil...
May 21, 2019: Journal of Chemical Ecology
Jean-Marc Lassance, Glenn P Svensson, Mikhail V Kozlov, Wittko Francke, Christer Löfstedt
Animal classification is primarily based on morphological characters, even though these may not be the first to diverge during speciation. In many cases, closely related taxa are actually difficult to distinguish based on morphological characters alone, especially when there is no substantial niche separation. As a consequence, the diversity of certain groups is likely to be underestimated. Lepidoptera -moths and butterflies- represent the largest group of herbivorous insects. The extensive diversification in the group is generally assumed to have its origin in the spectacular radiation of flowering plants and the resulting abundance of ecological niches...
June 2019: Journal of Chemical Ecology
Christian Schiebe, C Rikard Unelius, Suresh Ganji, Muhammad Binyameen, Göran Birgersson, Fredrik Schlyter
Bark beetles kill apparently vigorous conifers during epidemics by means of pheromone-mediated aggregation. During non-endemic conditions the beetles are limited to use trees with poor defense, like wind-thrown. To find olfactory cues that help beetles to distinguish between trees with strong or weak defense, we collected volatiles from the bark surface of healthy felled or standing Picea abies trees. Furthermore, living trees were treated with methyl jasmonate in order to induce defense responses. Volatiles were analyzed by combined gas chromatography and electroantennographic detection (GC-EAD) on Ips typographus antennae...
May 4, 2019: Journal of Chemical Ecology
Linnea R Meier, Jocelyn G Millar, Judith A Mongold-Diers, Lawrence M Hanks
Males of several species in the large cerambycid beetle subfamily Lamiine, native to South and North America, are known to produce aggregation-sex pheromones composed of three related structures: the sesquiterpene catabolic product geranylacetone, its corresponding alcohol (known as fuscumol), and the acetate ester of the alcohol (fuscumol acetate). Here, we show that males of two lamiine species native to the eastern USA, Astylopsis macula (Say) and Leptostylus transversus (Gyllenhal) (both tribe Acanthocinini), produce pheromones composed of the structurally related (S)-6-methylhept-5-en-2-ol ([S]-sulcatol)...
April 16, 2019: Journal of Chemical Ecology
Nao Fujiwara-Tsujii, Hiroe Yasui, Tetsuya Yasuda, Sadao Wakamura, Toshiharu Akino, Midori Fukaya, Toshio Suzuki, Takashi Hoshi, Hisahiro Hagiwara, Hiroshi Ono
The elytra of females of the white-spotted longhorn beetle, Anoplophora malasiaca (Coleoptera: Cerambycidae), are coated with a contact sex pheromone, which was previously shown to be composed of at least three chemical groups. Individually, the chemical groups had little pheromonal activity, but a blend of all three exhibited activity equal to that of the crude female extract. Two groups are female-specific aliphatic hydrocarbons and ketones, which were previously synthesized and confirmed to elicit mating behavior...
April 3, 2019: Journal of Chemical Ecology
Yi-Han Xia, Ya-Nan Zhang, Bao-Jian Ding, Hong-Lei Wang, Christer Löfstedt
The beet armyworm, Spodoptera exigua, uses (Z,E)-9,12-tetradecadienyl acetate as the major component of its sex pheromone. Previous isotope-labeling experiments demonstrated an unusual ∆12 desaturase activity involved in the biosynthesis of this compound; however, the putative ∆12 desaturase gene has not been reported to date. In the present study, we confirmed this ∆12 desaturation pathway by in vivo labeling experiments, and characterized candidate desaturase genes in a yeast heterologous expression system...
April 2, 2019: Journal of Chemical Ecology
Jacqueline M Serrano, J Steven McElfresh, Yunfan Zou, Jocelyn G Millar
Insect pheromones have rarely been exploited in surveys or studies of rare and endangered species, despite their potential as effective and highly selective attractants for target species. Here, we report the identification, synthesis, and field bioassays of a male-produced aggregation-sex pheromone blend of a rare false click beetle species endemic to southern California, Dohrn's elegant eucnemid beetle, Palaeoxenus dohrni Horn (Coleoptera: Eucnemidae). This species is the only extant species in its genus and subfamily...
April 1, 2019: Journal of Chemical Ecology
Peng Wang, Xuewei Yin, Long Zhang
Several hypotheses have been proposed to explain how herbivorous insects approach plants by sensing plant volatiles. Insect antennae and maxillary palps are believed to have crucial roles in the detection of host plant volatiles. However, few studies have assessed the roles of these olfactory organs in food selection in terms of the effects of individual volatile compounds from plants at various distances. Therefore, we assessed the palp-opening response (POR), biting response, and selection behavior of locust (Locusta migratoria) nymphs in response to volatile compounds from host and non-host plants at various distances...
April 2019: Journal of Chemical Ecology
Hao Xu, Guoxin Zhou, Stefan Dötterl, Irmgard Schäffler, Martin von Arx, Gregory Röder, Thomas Degen, Li Chen, Ted C J Turlings
Gregarious parasitoids usually clump their cocoons together and the adults emerge in a synchronized fashion. This makes it easy for them to find mating partners and most copulations indeed take place at the natal patch. Yet, males should leave such sites when females are no longer receptive. As yet, this decision-making process and the possible involvement of pheromones were poorly understood. Here we report on a remarkable use of attractive and repellent pheromones of the well-studied gregarious parasitoid species Cotesia glomerata (L...
March 28, 2019: Journal of Chemical Ecology
Rupesh R Kariyat, Iffa Gaffoor, Sampurna Sattar, Cullen W Dixon, Nadia Frock, Juliet Moen, Consuelo M De Moraes, Mark C Mescher, Gary A Thompson, Surinder Chopra
In this study we examined the role of sorghum flavonoids in providing resistance against corn leaf aphid (CLA) Rhopalosiphum maidis. In sorghum, accumulation of these flavonoids is regulated by a MYB transcription factor, yellow seed1 (y1). Functional y1 alleles accumulate 3-deoxyflavonoids (3-DFs) and 3-deoxyanthocyanidins (3-DAs) whereas null y1 alleles fail to accumulate these compounds. We found that significantly higher numbers of alate CLA adults colonized null y1 plants as compared to functional y1 plants...
March 26, 2019: Journal of Chemical Ecology
Toshiki Ohashi, Shinji Ohta, Hisashi Ômura
The common grass yellow Eurema mandarina (Lepidoptera: Pieridae) uses the silk tree Albizia julibrissin (Fabaceae) as a primary host in Japan. We previously reported that D-pinitol, a cyclitol found in fresh leaves of A. julibrissin, solely elicits moderate oviposition responses from females. However, the aqueous neutral/amphoteric fraction of the fresh leaf extract containing D-pinitol weakly induces oviposition. Moreover, the aqueous neutral/amphoteric/basic fraction was significantly more active than the neutral/amphoteric fraction in eliciting responses, indicating that some basic compounds are involved in stimulating oviposition...
March 18, 2019: Journal of Chemical Ecology
R Maxwell Collignon, Sean Halloran, Jacqueline M Serrano, J Steven McElfresh, Jocelyn G Millar
We report the identification of p-mentha-1,3-dien-8-ol, an unstable monoterpene alcohol, as a male-produced aggregation-sex pheromone component of the cerambycid beetle Paranoplium gracile (Leconte) (subfamily Cerambycinae, tribe Oemini), a species endemic to California. Headspace volatiles from live males contained a blend of nine cyclic terpenoids that were not detected in analogous samples from females. Volatiles produced by male Eudistenia costipennis Fall, also in the tribe Oemini, contained the same suite of nine compounds...
March 11, 2019: Journal of Chemical Ecology
C Marneweck, A Jürgens, A M Shrader
The original version of this article unfortunately contained some mistakes.
March 11, 2019: Journal of Chemical Ecology
Saw Steven, Masayoshi Uefune, Rika Ozawa, Junji Takabayashi, Yooichi Kainoh
In nature, parasitoid wasps encounter and sometimes show oviposition behavior to nonhost species. However, little is known about the effect of such negative incidences on their subsequent host-searching behavior. We tested this effect in a tritrophic system of maize plants (Zea mays), common armyworms (hosts), tobacco cutworms (nonhosts), and parasitoid wasps, Cotesia kariyai. We used oviposition inexperienced C. kariyai and negative-experienced individuals that had expressed oviposition behavior toward nonhosts on nonhost-infested maize leaves...
March 11, 2019: Journal of Chemical Ecology
Courtney Marneweck, Andreas Jürgens, Adrian M Shrader
The original version of this article unfortunately contained some mistakes.
March 8, 2019: Journal of Chemical Ecology
Elda Vitanović, Jeffrey R Aldrich, Shaun L Winterton, Kyria Boundy-Mills, Julian M Lopez, Frank G Zalom
Many adult Chrysoperla comanche (Stephens) green lacewings were caught in traps baited with live yeast cultures during tests designed to catch olive fruit flies. All 13 yeast species tested were more attractive than the industry-standard dried torula yeast (Cyberlindnera jadinii; syn. Candida utilis). Live C. jadinii culture attracted significantly more lacewings than the inactive dried-pellet form of the same yeast species, demonstrating that volatiles from live yeast cultures attract adults of this lacewing...
March 4, 2019: Journal of Chemical Ecology
Li Chen, Ya-Ya Li, Kai-Min Shao
Host-plant volatiles play a key role in finding mate and suitable host plants of phytophagous scarab beetles. Hence it is immensely important to collect and identify these volatiles. The gas chromatography coupled with electroantennographic detection (GC-EAD) technique has been used as a rapid and convenient tool for the identification of physiologically active components from plants. Here, we describe a practical method for electrophysiologically recording from lamellated antenna of scarab beetles. This method enables direct electroantennogram (EAG) recordings from antennal club without damage to the antenna in a similar manner to the conventional cut-tip EAG recording technique for clavate antenna...
March 2, 2019: Journal of Chemical Ecology
Christine Lembke, Daniel Stettin, Franziska Speck, Nico Ueberschaar, Sam De Decker, Wim Vyverman, Georg Pohnert
The original version of this article unfortunately contained a mistake. The chemical structure of compound 6 in Fig. 1 was incorrect. The tested compound 6 in this study was (3S,8aS)-3-isobutylhexahydropyrrolo[1,2-a]pyrazine-1,4-dione as shown in the corrected version of Fig. 1 here.
March 2, 2019: Journal of Chemical Ecology
Fabian R Ortiz-Carreon, Julio C Rojas, Juan Cisneros, Edi A Malo
Chelonus insularis (Hymenoptera: Braconidae) is an egg-larval endoparasitoid that attacks several lepidopteran species, including the fall armyworm (FAW), Spodoptera frugiperda, as one of its main hosts. In this study, we identified the volatiles emitted by maize plants undamaged and damaged by S. frugiperda larvae that were attractive to virgin C. insularis females. In a Y-glass tube olfactometer, parasitoid females were more attracted to activated charcoal extracts than Porapak Q maize extracts. Chemical analysis of activated charcoal extracts from maize plants damaged by S...
March 2019: Journal of Chemical Ecology
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