Unexpected plant odor responses in a moth pheromone system

Rouyar, AngÃ©la; Deisig, Nina; Dupuy, Fabienne; Limousin, Denis; Wycke, Marie-Anne; Renou, Michel; Anton, Sylvia

doi:10.3389/fphys.2015.00148

Cited by 36 publications

(51 citation statements)

References 61 publications

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“…It is interesting that GR35 and 50, expressed specifically in male head, detect plant compounds. Males also use plant compounds to find food sources and might use host-plant chemical cues to identify the habitat of calling females 35 . HarmGR195, which is specifically expressed in the adult tarsi, responded to proline in a dose-dependent manner.…”

Section: Discussionmentioning

confidence: 99%

Expansion of a bitter taste receptor family in a polyphagous insect herbivore

Wang¹

2016

2016 International Congress of Entomology

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The Insect taste system plays a central role in feeding behaviours and co-evolution of insect-host interactions. Gustatory receptors form the interface between the insect taste system and the environment. From genome and transcriptome sequencing we identified 197 novel gustatory receptor (GR) genes from the polyphagous pest Helicoverpa armigera. These GRs include a significantly expanded bitter receptor family (180 GRs) that could be further divided into three categories based on polypeptide lengths, gene structure and amino acid sequence. Type 1 includes 29 bitter Gr genes that possess introns. Type 2 includes 13 long intronless bitter Gr genes, while Type 3 comprises 131 short intronless bitter Gr genes. Calcium imaging analysis demonstrated that three Type 3 GRs (HarmGR35, HarmGR50 and HarmGR195) can be activated by a crude extract of cotton leaves. HarmGR195, a GR specifically and selectively expressed in adult tarsi, showed a specific response to proline, an amino acid widely present in plant tissues. We hypothesise that the expansion in the H. armigera GR family may be functionally tied to its polyphagous behavior. Understanding the molecular basis of polyphagy may provide opportunities for the development of new environmentally friendly pest control strategies.Chemosensory receptors represent an interface between an insect and its chemical environment, mediating pivotal biological processes such as host finding, mate selection and choice of oviposition sites 1 . One gene family, the gustatory receptors (GRs), plays a central role in co-ordinating insect feeding behaviours 1 . Taste stimuli from the environment are recognized by GRs located on the dendrites of taste sensilla, which are distributed throughout the insect body 1 . Despite a growing body of knowledge about the insect taste system, little is known about the molecular and cellular mechanisms that underlie taste signal recognition or how these signals affect feeding behaviours.Insect Gr genes were first identified from the Drosophila melanogaster genome 2 . They have been classified into four clades: CO 2 3 , GR43a-like 4 , sugar 5-10 and bitter 11,12 . To date, published research on GRs has been focused on Drosophila 5,6,[8][9][10][13][14][15][16][17] 24 . Therefore, the study on gustatory systems of these four species can shed light on the interactions between host plants and specialist herbivores but may be less relevant to generalist species like Helicoverpa armigera, which include significant pests of human agriculture. H. armigera itself is one of the most polyphagous lepidopteran pest species, with larvae that feed on numerous cultivated crops such as cotton, peanuts, soybeans and maize. H. armigera would be an ideal species for studying the gustatory receptor

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Section: Discussionmentioning

confidence: 99%

Expansion of a bitter taste receptor family in a polyphagous insect herbivore

Wang¹

2016

2016 International Congress of Entomology

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“…It has been proposed that host plant volatiles mediate male attraction to mating sites either by themselves, before the onset of pheromone release by females, or by synergizing the response to sex pheromone (Landolt and Phillips 1997;Reddy and Guerrero 2004;Beyaert and Hilker 2014). In some species, host plant volatiles increase male attraction toward sex pheromone Light et al 1993;Yang et al 2004;Schmidt-Büsser et al 2009;Varela et al 2011;von Arx et al 2012), whereas they produce an antagonistic effect in other species (Pregitzer et al 2012;Jung et al 2013;Party et al 2013;Rouyar et al 2015). It is conceivable that volatiles from nonhost plants (Wang et al 2016), volatiles from damaged plants, such as DMNT (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Integration of pheromone and plant volatile stimuli occurs in olfactory sensory neurons on the antennae in some species (Rouyar et al. ; Lebreton et al. ) and otherwise in the antennal lobe, the primary olfactory center in the insect brain (Namiki et al.…”

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confidence: 99%

“…Perception of sex and plant volatiles typically involves discrete peripheral input channels, and two different types of insect olfactory receptors, pheromone, and general odorant receptors, respectively (Krieger et al 2004;Sakurai et al 2004;Zhang and Löfstedt 2015). Integration of pheromone and plant volatile stimuli occurs in olfactory sensory neurons on the antennae in some species (Rouyar et al 2015;Lebreton et al 2017) and otherwise in the antennal lobe, the primary olfactory center in the insect brain (Namiki et al 2008;Trona et al 2010Trona et al , 2013Chaffiol et al 2012Chaffiol et al , 2014Hatano et al 2015;Ian et al 2017).…”

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Plant odor and sex pheromone are integral elements of specific mate recognition in an insect herbivore

et al. 2018

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Specific mate recognition relies on the chemical senses in most animals, and especially in nocturnal insects. Two signal types mediate premating olfactory communication in terrestrial habitats: sex pheromones, which blend into an atmosphere of plant odorants. We show that host plant volatiles affect the perception of sex pheromone in males of the African cotton leafworm Spodoptera littoralis and that pheromone and plant volatiles are not perceived as independent messages. In clean air, S. littoralis males are attracted to single synthetic pheromone components or even the pheromone of a sibling species, oriental cotton leafworm S. litura. Presence of host plant volatiles, however, reduces the male response to deficient or heterospecific pheromone signals. That plant cues enhance discrimination of sex pheromone quality confirms the idea that specific mate recognition in noctuid moths has evolved in concert with adaptation to host plants. Shifts in either female host preference or sex pheromone biosynthesis give rise to new communication channels that have the potential to initiate or contribute to reproductive isolation.

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“…This challenge is met by the use of volatiles that may be carried over vast distances with the wind in the form of odour plumes (Beyaert & Hilker, ). The signal effect of many insect pheromones may be augmented or complemented by host plant volatiles, resulting in an overall better response (Reddy & Guerrero, ; Rouyar et al , ). Furthermore, flowers emit odours to attract insects for pollination, although insects are usually only responsive to the subset of compounds that mimic their own pheromones (Raguso, , ; Bruce & Pickett, ).…”

Section: Introductionmentioning

confidence: 99%

Volatiles from the burnet moth Zygaena filipendulae (Lepidoptera) and associated flowers, and their involvement in mating communication

et al. 2015

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The burnet moth Zygaena filipendulae L. contains the cyanogenic glucosides linamarin and lotaustralin, which can be degraded to the volatiles hydrogen cyanide (HCN), acetone and 2-butanone. Linamarin and lotaustralin are transferred from the male to female during mating and thus are considered to be involved in mating communication. Because volatile semiochemical cues play a major role in mating communication in many insect species, the emissions of HCN, acetone and 2-butanone from Z. filipendulae are characterized in the present study, aiming to determine the interplay between the degradation products of cyanogenic glucosides and pheromones. The volatile emissions from Z. filipendulae and flowers inducing mating are measured using headspace solid-phase micro-extraction and gas chromatography-mass spectrometry analysis. All Z. filipendulae life stages emit HCN, acetone and 2-butanone. Virgin females show higher emissions than mated females, whereas mated males have higher emissions than virgin males. Hydrogen cyanide is only rarely detected in the course of male-female copulation. These observations indicate a role for the cyanogenic glucoside derived volatiles in female calling and male courtship behaviours, although not as a defence during copulation. Males rejected for mating by a female are accepted after injection of linamarin or lotaustralin, demonstrating that cyanogenic glucosides are also important for female assessment of the fitness of the male. Volatiles from flowers occupied during mate calling are also analyzed, and emissions from males and females result in the identification of novel putative pheromones for Z. filipendulae.

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Unexpected plant odor responses in a moth pheromone system

Cited by 36 publications

References 61 publications

Expansion of a bitter taste receptor family in a polyphagous insect herbivore

Expansion of a bitter taste receptor family in a polyphagous insect herbivore

Plant odor and sex pheromone are integral elements of specific mate recognition in an insect herbivore

Volatiles from the burnet moth Zygaena filipendulae (Lepidoptera) and associated flowers, and their involvement in mating communication

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