The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Yolanda H. Chen - One of the best experts on this subject based on the ideXlab platform.
-
Racemic Pheromone Blends Disrupt Mate Location in the Invasive Swede Midge, Contarinia nasturtii
Journal of Chemical Ecology, 2019Co-Authors: Elisabeth A. Hodgdon, Chase A. Stratton, Kimberly F. Wallin, Rebecca H Hallett, Yolanda H. ChenAbstract:Swede midge, Contarinia nasturtii Kieffer, is an invasive cecidomyiid pest that causes serious losses of Brassica oilseed and vegetable crops in the Northeastern U.S. and Canada. Currently, few alternatives to systemic insecticides exist for its management. Because a single feeding larva can render heading Brassica crops unmarketable, management strategies that prevent oviposition are needed urgently. Pheromone-mediated mating disruption is a promising management approach for swede midge because it prevents mating and subsequent crop damage. While the swede midge Pheromone has been identified, one of the major barriers to using it in mating disruption is the high cost of synthesis. Racemic Blends, consisting of natural and non-natural stereoisomers, could be useful for mating disruption because they are cheaper to produce. However, it is not clear whether racemic Pheromone Blends attract males and/or prevent them from locating and mating with females. Here, we studied the behavior of male swede midge in Y-tube and wind tunnel bioassays to Pheromone Blends. Specifically, we tested whether males: (1) are attracted to different doses of Pheromone, (2) discriminate between Blends comprising natural stereospecific or racemic components, or a combination thereof, and (3) are able to locate and copulate with females in Pheromone-permeated olfactometers. We found that picogram amounts of Pheromone attracted males and prevented them from locating females in y-tube olfactometers. While males were more attracted to stereospecific Blends, compared to racemic Blends, all Blends tested prevented nearly all males mating with females. Therefore, low dose racemic Blends may be promising for Pheromone-mediated mating disruption.
Neil J. Vickers - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Transplant Antennae and Host Brain Interact to Shape Odor Perceptual Space in Male
2016Co-Authors: Seong Gyu Lee, Kathy Poole, Charles E Linn, Neil J. VickersAbstract:Behavioral responses to odors rely first upon their accurate detection by peripheral sensory organs followed by subsequent processing within the brain’s olfactory system and higher centers. These processes allow the animal to form a unified impression of the odor environ-ment and recognize combinations of odorants as single entities. To investigate how interac-tions between peripheral and central olfactory pathways shape odor perception, we transplanted antennal imaginal discs between larval males of two species of moth Heliothis virescens and Heliothis subflexa that utilize distinct Pheromone Blends. During metamorphic development olfactory receptor neurons originating from transplanted discs formed connec-tions with host brain neurons within olfactory glomeruli of the adult antennal lobe. The nor-mal antennal receptor repertoire exhibited by males of each species reflects the differences in the Pheromone Blends that these species employ. Behavioral assays of adult transplant males revealed high response levels to two odor Blends that were dissimilar from those that attract normal males of either species. Neurophysiological analyses of peripheral receptor neurons and central olfactory neurons revealed that these behavioral responses were a result of: 1. the specificity of H. virescens donor olfactory receptor neurons for odorants unique to the donor Pheromone blend and, 2. central odor recognition by the H. subflexa host brain, which typically requires peripheral receptor input across 3 distinct odor channels in order to elicit behavioral responses
-
Transplant Antennae and Host Brain Interact to Shape Odor Perceptual Space in Male Moths
PloS one, 2016Co-Authors: Seong Gyu Lee, Kathy Poole, Charles E Linn, Neil J. VickersAbstract:Behavioral responses to odors rely first upon their accurate detection by peripheral sensory organs followed by subsequent processing within the brain’s olfactory system and higher centers. These processes allow the animal to form a unified impression of the odor environment and recognize combinations of odorants as single entities. To investigate how interactions between peripheral and central olfactory pathways shape odor perception, we transplanted antennal imaginal discs between larval males of two species of moth Heliothis virescens and Heliothis subflexa that utilize distinct Pheromone Blends. During metamorphic development olfactory receptor neurons originating from transplanted discs formed connections with host brain neurons within olfactory glomeruli of the adult antennal lobe. The normal antennal receptor repertoire exhibited by males of each species reflects the differences in the Pheromone Blends that these species employ. Behavioral assays of adult transplant males revealed high response levels to two odor Blends that were dissimilar from those that attract normal males of either species. Neurophysiological analyses of peripheral receptor neurons and central olfactory neurons revealed that these behavioral responses were a result of: 1. the specificity of H. virescens donor olfactory receptor neurons for odorants unique to the donor Pheromone blend and, 2. central odor recognition by the H. subflexa host brain, which typically requires peripheral receptor input across 3 distinct odor channels in order to elicit behavioral responses.
-
Inheritance of Olfactory Preferences I. Pheromone-Mediated Behavioral Responses of Heliothis subflexa × Heliothis virescens Hybrid Male Moths
Brain behavior and evolution, 2006Co-Authors: Neil J. VickersAbstract:Shifts in male preference for qualitatively different Pheromone Blends appear to have played a fundamental role in the divergence of olfactory communication and evolution of moth species. As an initia
-
Plasticity in central olfactory processing and Pheromone blend discrimination following interspecies antennal imaginal disc transplantation.
The Journal of comparative neurology, 2005Co-Authors: Neil J. Vickers, Kathy Poole, Charles E LinnAbstract:The antennal imaginal disc was transplanted between pre-metamorphic male larvae of two different Lepidopteran moth species. Following adult eclosion, electrophysiological recordings were made from 33 central olfactory neurons in the antennal lobes of both Helicoverpa zea donor to Heliothis virescens recipient (Z-V) and reciprocal (V-Z) transplants. Under the influence of sensory neuron input derived from the transplanted antennal imaginal disc, most antennal lobe projection neurons (29/33) were classified as belonging to physiological categories encountered previously in donor species males. Furthermore, when stained, many of these neurons had dendritic arbors restricted to donor-induced glomerular locations predicted by their physiology. However, some neurons with unexpected physiological profiles were also identified (4/33), but only in V-Z transplants. These profiles help to explain why some V-Z bilateral transplants were able to respond to both Pheromone Blends in flight tunnel bioassays, an unforeseen result counter to the assumption that a donor antenna develops a normal donor antennal olfactory receptor neuron compliment. Stainings of several neurons in V-Z transplant males also revealed unusual morphological features including multiglomerular dendritic arbors and “incorrect” glomerular locations. These results indicate a developmental plasticity in the final dendritic arborization pattern of central olfactory neurons including an ability to colonize and integrate inputs across topographically novel donor glomeruli, different from those found in the normal recipient antennal lobe.
-
Consequences of interspecies antennal imaginal disc transplantation on organization of olfactory glomeruli and Pheromone blend discrimination.
The Journal of comparative neurology, 2003Co-Authors: Neil J. Vickers, Kathy Poole, Charles E LinnAbstract:The antennal imaginal disc was transplanted between male larvae of two different heliothine moth species, Heliothis virescens (HV) and Helicoverpa zea (HZ). Males of these species respond to distinct Pheromone Blends, have different peripheral and central olfactory neuron specificities, as well as distinct arrangements of antennal lobe olfactory glomeruli, in the specialized male macroglomerular complex (MGC). After pupal development and adult eclosion, unilateral (with one antennal disc left intact) and bilateral antennal transplant males were assayed in a wind tunnel to both species' Pheromone Blends to determine their ability to discriminate between the two signals. The postmetamorphic developmental effects of interspecific transplantation upon the primary olfactory centers in the moth brain were then examined in these same individuals. Behavioral tests showed that both types of unilateral transplant continued to exhibit upwind anemotactic flight to the normal recipient blend with occasional flights to the donor blend. In contrast, bilateral transplants preferred the HV Pheromone blend regardless of the direction of transplant, with some males of each type also responding to the HZ blend. Neuroanatomic evaluation of the MGC revealed that the donor arrangement of MGC glomeruli was induced in 73% HZ donor to HV recipient transplants and 56% of the reciprocal transplant. Surprisingly, several V-Z bilateral transplant males responded to both HV and HZ Pheromone Blends and had two HV MGC structures. This behavioral outcome was unexpected, because responses to the HV blend are mediated by inputs that are normally antagonistic to HZ males and the normal HV antenna lacks olfactory receptor neurons capable of responding to the essential minor Pheromone component of the HZ blend. These data indicate a plasticity in developmental pathways regulating the expression of peripheral olfactory receptor neurons and in the glomerular processing of species-specific olfactory information.
Christian Bordereau - One of the best experts on this subject based on the ideXlab platform.
-
Identification of multi-component trail Pheromones in the most evolutionarily derived termites, the Nasutitermitinae (Termitidae)
Biological Journal of the Linnean Society, 2010Co-Authors: David Sillam-dussès, Etienne Sémon, Alain Robert, Eliana Cancello, Michael Lenz, Irena Valterova, Christian BordereauAbstract:In the present study, trail Pheromone Blends are identified for the first time in termites. In the phylogenetically complex Nasutitermitinae, trail-following Pheromones are composed of dodecatrienol and neocembrene, the proportions of which vary according to species, although neocembrene is always more abundant than dodecatrienol (by 25–250-fold). Depending on species, termites were more sensitive to dodecatrienol or to neocembrene but the association of both components always elicited significantly higher trail following, with a clear synergistic effect in most of the studied species. A third component, trinervitatriene, was identified in the sternal gland secretion of several species, but its function remains unknown. The secretion of trail Pheromone Blends appears to be an important step in the evolution of chemical communication in termites. The Pheromone optimizes foraging, and promotes their ecological success.
-
Identification of multi-component trail Pheromones in the most evolutionarily derived termites, the Nasutitermitinae (Termitidae)
Biological Journal of the Linnean Society, 2010Co-Authors: David Sillam-dussès, Etienne Sémon, Alain Robert, Eliana Cancello, Michael Lenz, Irena Valterova, Christian BordereauAbstract:In the present study, trail Pheromone Blends are identified for the first time in termites. In the phylogenetically complex Nasutitermitinae, trail-following Pheromones are composed of dodecatrienol and neocembrene, the proportions of which vary according to species, although neocembrene is always more abundant than dodecatrienol (by 252013250-fold). Depending on species, termites were more sensitive to dodecatrienol or to neocembrene but the association of both components always elicited significantly higher trail following, with a clear synergistic effect in most of the studied species. A third component, trinervitatriene, was identified in the sternal gland secretion of several species, but its function remains unknown. The secretion of trail Pheromone Blends appears to be an important step in the evolution of chemical communication in termites. The Pheromone optimizes foraging, and promotes their ecological success.††© 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 99, 20201327.
Elisabeth A. Hodgdon - One of the best experts on this subject based on the ideXlab platform.
-
Racemic Pheromone Blends Disrupt Mate Location in the Invasive Swede Midge, Contarinia nasturtii
Journal of Chemical Ecology, 2019Co-Authors: Elisabeth A. Hodgdon, Chase A. Stratton, Kimberly F. Wallin, Rebecca H Hallett, Yolanda H. ChenAbstract:Swede midge, Contarinia nasturtii Kieffer, is an invasive cecidomyiid pest that causes serious losses of Brassica oilseed and vegetable crops in the Northeastern U.S. and Canada. Currently, few alternatives to systemic insecticides exist for its management. Because a single feeding larva can render heading Brassica crops unmarketable, management strategies that prevent oviposition are needed urgently. Pheromone-mediated mating disruption is a promising management approach for swede midge because it prevents mating and subsequent crop damage. While the swede midge Pheromone has been identified, one of the major barriers to using it in mating disruption is the high cost of synthesis. Racemic Blends, consisting of natural and non-natural stereoisomers, could be useful for mating disruption because they are cheaper to produce. However, it is not clear whether racemic Pheromone Blends attract males and/or prevent them from locating and mating with females. Here, we studied the behavior of male swede midge in Y-tube and wind tunnel bioassays to Pheromone Blends. Specifically, we tested whether males: (1) are attracted to different doses of Pheromone, (2) discriminate between Blends comprising natural stereospecific or racemic components, or a combination thereof, and (3) are able to locate and copulate with females in Pheromone-permeated olfactometers. We found that picogram amounts of Pheromone attracted males and prevented them from locating females in y-tube olfactometers. While males were more attracted to stereospecific Blends, compared to racemic Blends, all Blends tested prevented nearly all males mating with females. Therefore, low dose racemic Blends may be promising for Pheromone-mediated mating disruption.
Charles E Linn - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Transplant Antennae and Host Brain Interact to Shape Odor Perceptual Space in Male
2016Co-Authors: Seong Gyu Lee, Kathy Poole, Charles E Linn, Neil J. VickersAbstract:Behavioral responses to odors rely first upon their accurate detection by peripheral sensory organs followed by subsequent processing within the brain’s olfactory system and higher centers. These processes allow the animal to form a unified impression of the odor environ-ment and recognize combinations of odorants as single entities. To investigate how interac-tions between peripheral and central olfactory pathways shape odor perception, we transplanted antennal imaginal discs between larval males of two species of moth Heliothis virescens and Heliothis subflexa that utilize distinct Pheromone Blends. During metamorphic development olfactory receptor neurons originating from transplanted discs formed connec-tions with host brain neurons within olfactory glomeruli of the adult antennal lobe. The nor-mal antennal receptor repertoire exhibited by males of each species reflects the differences in the Pheromone Blends that these species employ. Behavioral assays of adult transplant males revealed high response levels to two odor Blends that were dissimilar from those that attract normal males of either species. Neurophysiological analyses of peripheral receptor neurons and central olfactory neurons revealed that these behavioral responses were a result of: 1. the specificity of H. virescens donor olfactory receptor neurons for odorants unique to the donor Pheromone blend and, 2. central odor recognition by the H. subflexa host brain, which typically requires peripheral receptor input across 3 distinct odor channels in order to elicit behavioral responses
-
Transplant Antennae and Host Brain Interact to Shape Odor Perceptual Space in Male Moths
PloS one, 2016Co-Authors: Seong Gyu Lee, Kathy Poole, Charles E Linn, Neil J. VickersAbstract:Behavioral responses to odors rely first upon their accurate detection by peripheral sensory organs followed by subsequent processing within the brain’s olfactory system and higher centers. These processes allow the animal to form a unified impression of the odor environment and recognize combinations of odorants as single entities. To investigate how interactions between peripheral and central olfactory pathways shape odor perception, we transplanted antennal imaginal discs between larval males of two species of moth Heliothis virescens and Heliothis subflexa that utilize distinct Pheromone Blends. During metamorphic development olfactory receptor neurons originating from transplanted discs formed connections with host brain neurons within olfactory glomeruli of the adult antennal lobe. The normal antennal receptor repertoire exhibited by males of each species reflects the differences in the Pheromone Blends that these species employ. Behavioral assays of adult transplant males revealed high response levels to two odor Blends that were dissimilar from those that attract normal males of either species. Neurophysiological analyses of peripheral receptor neurons and central olfactory neurons revealed that these behavioral responses were a result of: 1. the specificity of H. virescens donor olfactory receptor neurons for odorants unique to the donor Pheromone blend and, 2. central odor recognition by the H. subflexa host brain, which typically requires peripheral receptor input across 3 distinct odor channels in order to elicit behavioral responses.
-
evidence of olfactory antagonistic imposition as a facilitator of evolutionary shifts in Pheromone blend usage in ostrinia spp lepidoptera crambidae
Journal of Insect Physiology, 2007Co-Authors: Michael J Domingue, Callie J Musto, Charles E Linn, Wendell L Roelofs, Thomas C BakerAbstract:Abstract Olfactory receptor neuron (ORN) response was measured to assess why some males (“rare males”) of the Asian corn borer (ACB), Ostrinia furnacalis, have a broad behavioral response to fly upwind to both the ACB and the European corn borer (ECB), Ostrinia nubilalis, Pheromone Blends. We performed single-sensillum electrophysiological recordings on ACB males that had been behaviorally assessed for upwind flight response to the ACB blend [60:40 (Z)-12-tetradecenyl acetate (Z12-14:OAc) to (E)-12-tetradecenyl acetate (E12-14:OAc)], as well as to ECB (Z-strain) and ECB (E-strain) Blends [3:97 and 99:1 (Z)-11-tetradecenyl acetate (Z11-14:OAc) to (E)-11-tetradecenyl acetate (E11-14:OAc)]. Sensilla from all types of males had large- and small-spike-sized ORNs responding strongly to Z12- or E12-14:OAc, but weakly to Z11- and E11-14:OAc. In the majority of males (“normal males”) that flew upwind only to the ACB blend, Z11-14:OAc elicited responses in an intermediate spike-sized ORN associated with behavioral antagonism that is mainly tuned to (Z)-9-tetradecenyl acetate (Z9-14:OAc). In the rare-type ACB males that flew to both the ACB and ECB Pheromone Blends, Z11-14:OAc did not stimulate this ORN. Increased responsiveness to ancestral Pheromone components by ORNs associated with behavioral antagonism could be instrumental in reproductive character displacement, or in reinforcement and reproductive isolation during speciation by helping to increase assortative mating between males and females in derived populations that use novel sex Pheromone Blends.
-
Plasticity in central olfactory processing and Pheromone blend discrimination following interspecies antennal imaginal disc transplantation.
The Journal of comparative neurology, 2005Co-Authors: Neil J. Vickers, Kathy Poole, Charles E LinnAbstract:The antennal imaginal disc was transplanted between pre-metamorphic male larvae of two different Lepidopteran moth species. Following adult eclosion, electrophysiological recordings were made from 33 central olfactory neurons in the antennal lobes of both Helicoverpa zea donor to Heliothis virescens recipient (Z-V) and reciprocal (V-Z) transplants. Under the influence of sensory neuron input derived from the transplanted antennal imaginal disc, most antennal lobe projection neurons (29/33) were classified as belonging to physiological categories encountered previously in donor species males. Furthermore, when stained, many of these neurons had dendritic arbors restricted to donor-induced glomerular locations predicted by their physiology. However, some neurons with unexpected physiological profiles were also identified (4/33), but only in V-Z transplants. These profiles help to explain why some V-Z bilateral transplants were able to respond to both Pheromone Blends in flight tunnel bioassays, an unforeseen result counter to the assumption that a donor antenna develops a normal donor antennal olfactory receptor neuron compliment. Stainings of several neurons in V-Z transplant males also revealed unusual morphological features including multiglomerular dendritic arbors and “incorrect” glomerular locations. These results indicate a developmental plasticity in the final dendritic arborization pattern of central olfactory neurons including an ability to colonize and integrate inputs across topographically novel donor glomeruli, different from those found in the normal recipient antennal lobe.
-
Consequences of interspecies antennal imaginal disc transplantation on organization of olfactory glomeruli and Pheromone blend discrimination.
The Journal of comparative neurology, 2003Co-Authors: Neil J. Vickers, Kathy Poole, Charles E LinnAbstract:The antennal imaginal disc was transplanted between male larvae of two different heliothine moth species, Heliothis virescens (HV) and Helicoverpa zea (HZ). Males of these species respond to distinct Pheromone Blends, have different peripheral and central olfactory neuron specificities, as well as distinct arrangements of antennal lobe olfactory glomeruli, in the specialized male macroglomerular complex (MGC). After pupal development and adult eclosion, unilateral (with one antennal disc left intact) and bilateral antennal transplant males were assayed in a wind tunnel to both species' Pheromone Blends to determine their ability to discriminate between the two signals. The postmetamorphic developmental effects of interspecific transplantation upon the primary olfactory centers in the moth brain were then examined in these same individuals. Behavioral tests showed that both types of unilateral transplant continued to exhibit upwind anemotactic flight to the normal recipient blend with occasional flights to the donor blend. In contrast, bilateral transplants preferred the HV Pheromone blend regardless of the direction of transplant, with some males of each type also responding to the HZ blend. Neuroanatomic evaluation of the MGC revealed that the donor arrangement of MGC glomeruli was induced in 73% HZ donor to HV recipient transplants and 56% of the reciprocal transplant. Surprisingly, several V-Z bilateral transplant males responded to both HV and HZ Pheromone Blends and had two HV MGC structures. This behavioral outcome was unexpected, because responses to the HV blend are mediated by inputs that are normally antagonistic to HZ males and the normal HV antenna lacks olfactory receptor neurons capable of responding to the essential minor Pheromone component of the HZ blend. These data indicate a plasticity in developmental pathways regulating the expression of peripheral olfactory receptor neurons and in the glomerular processing of species-specific olfactory information.