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https://www.readbyqxmd.com/read/29115038/ultramorphological-and-molecular-characteristics-of-the-larval-stages-of-the-horse-nasal-myiasis-fly-rhinoestrus-sp-diptera-oestridae-from-mongolian-horse-in-china
#1
Junbin Dong, Haiquan Bao, Lai Mang
Rhinoestrus sp. (Diptera: Oestridae) is an economically important parasite that can cause severe nasal myiasis in equids and can also affect humans. The ultrastructure of all Rhinoestrus sp. larval instars from Mongolian horse was examined by light and scanning electron microscopy to characterize the features of Rhinoestrus. The structure of the anterior region, posterior region, and the spines of the third segment was analyzed for 10 specimens in each larval stage. Additionally, 34 third-instar (L3) larvae of Rhinoestrus sp...
November 8, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29063835/two-single-point-mutations-shift-the-ligand-selectivity-of-a-pheromone-receptor-between-two-closely-related-moth-species
#2
Ke Yang, Ling-Qiao Huang, Chao Ning, Chen-Zhu Wang
Male moths possess highly sensitive and selective olfactory systems that detect sex pheromones produced by their females. Pheromone receptors (PRs) play a key role in this process. The PR HassOr14b is found to be tuned to (Z)-9-hexadecenal, the major sex-pheromone component, in Helicoverpa assulta. HassOr14b is co-localized with HassOr6 or HassOr16 in two olfactory sensory neurons within the same sensilla. As HarmOr14b, the ortholog of HassOr14b in the closely related species Helicoverpa armigera, is tuned to another chemical (Z)-9-tetradecenal, we study the amino acid residues that determine their ligand selectivity...
October 24, 2017: ELife
https://www.readbyqxmd.com/read/29047261/deciphering-the-genes-for-taste-receptors-for-fructose-in-drosophila
#3
Shun Uchizono, Taichi Q Itoh, Haein Kim, Naoki Hamada, Jae Young Kwon, Teiichi Tanimura
Taste sensitivity to sugars plays an essential role in the initiation of feeding behavior. In Drosophila melanogaster, recent studies have identified several gustatory receptor (Gr) genes required for sensing sweet compounds. However, it is as yet undetermined how these GRs function as taste receptors tuned to a wide range of sugars. Among sugars, fructose has been suggested to be detected by a distinct receptor from other sugars. While GR43A has been reported to sense fructose in the brain, it is not expressed in labellar gustatory receptor neurons that show taste response to fructose...
October 2017: Molecules and Cells
https://www.readbyqxmd.com/read/29044744/ontogenetic-variation-in-the-sensory-structures-on-the-pedipalps-of-cosmetid-harvestmen-arachnida-opiliones-laniatores
#4
Victor R Townsend, Bruce P Enzmann
In arachnids, pedipalps are highly variable appendages that may be used in feeding, courtship, defense, and agonistic encounters. In cosmetid harvestmen, adults have pedipalps that feature flattened femora, spoon-shaped tibiae, and robust tarsal claws. In contrast, the pedipalps of nymphs are elongate with cylindrical podomeres and are adorned with delicate pretarsi. In this study, we used scanning electron microscopy to examine the distribution of cuticular structures (e.g., sensilla chaetica, pores) on the elements of the pedipalps of adults and nymphs of three species of cosmetid harvestmen...
October 17, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29043489/comparative-transcriptome-analysis-of-apis-mellifera-antennae-of-workers-performing-different-tasks
#5
Hongyi Nie, Shupeng Xu, Cuiqin Xie, Haiyang Geng, Yazhou Zhao, Jianghong Li, Wei-Fone Huang, Yan Lin, Zhiguo Li, Songkun Su
Honey bee is a social insect. Its colony is mainly coordinated by the chemical signals such as pheromones produced by queen or brood. Correspondingly, the worker bee developed numerous complicated olfactory sensilla in antennae for detection of these colony chemical signals and nectar/pollen signals in foraging. With the normal development of new emerged workers, young adults (nurse bee) worked in colony at the first 2-3 weeks and then followed by the foraging activity outside of the hive, which give rise to great change of the surrounding chemical signals...
October 17, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/29018358/identification-and-characterization-of-odorant-binding-proteins-in-the-forelegs-of-adelphocoris-lineolatus-goeze
#6
Liang Sun, Qian Wang, Qi Wang, Kun Dong, Yong Xiao, Yong-Jun Zhang
The chemosensory system is essential for insects to detect exogenous compounds, and odorant binding proteins (OBPs) play crucial roles in odorant binding and transduction. In the alfalfa plant bug Adelphocoris lineolatus, an important pest of multiple crops, our understanding of the physiological roles of antenna-biased OBPs has increased dramatically, whereas OBPs related to gustation have remained mostly unexplored. In this study, we employed RNA sequencing and RACE PCR methods to identify putative OBPs from the adult forelegs of both sexes...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29018357/distinct-subfamilies-of-odorant-binding-proteins-in-locust-orthoptera-acrididae-molecular-evolution-structural-variation-and-sensilla-specific-expression
#7
Xingcong Jiang, Jürgen Krieger, Heinz Breer, Pablo Pregitzer
Odorant binding proteins (OBPs) play an important role in insect olfaction, facilitating transportation of odorant molecules in the sensillum lymph. While most of the researches are concentrated on Lepidopteran and Dipteran species, our knowledge about Orthopteran species is still very limited. In this study, we have investigated OBPs of the desert locust Schistocerca gregaria, a representative Orthopteran species. We have identified 14 transcripts from a S. gregaria antennal transcriptome encoding SgreOBPs, and recapitulated the phylogenetic relationship of SgreOBPs together with OBPs from three other locust species...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28974761/neofunctionalization-of-juvenile-hormone-esterase-duplication-in-drosophila-as-an-odorant-degrading-enzyme-towards-food-odorants
#8
Claudia Steiner, Françoise Bozzolan, Nicolas Montagné, Martine Maïbèche, Thomas Chertemps
Odorant degrading enzymes (ODEs) are thought to be responsible, at least in part, for olfactory signal termination in the chemosensory system by rapid degradation of odorants in the vicinity of the receptors. A carboxylesterase, specifically expressed in Drosophila antennae, called "juvenile hormone esterase duplication (JHEdup)" has been previously reported to hydrolyse different fruit esters in vitro. Here we functionally characterize JHEdup in vivo. We show that the jhedup gene is highly expressed in large basiconic sensilla that have been reported to detect several food esters...
October 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28944748/host-location-behavior-of-the-tea-green-leafhopper-empoasca-vitis-g%C3%A3-the-hemiptera-cicadellidae-olfactory-and-visual-effects-on-their-orientation
#9
X Zhang, T Pengsakul, M Tukayo, L Yu, W Fang, D Luo
The tea green leafhopper, Empoasca vitis Göthe, is one of the most serious pests in tea growing areas. This study investigated the roles played by olfaction and vision in host orientation behavior. The compound eye of E. vitis was found to be a photopic eye; few olfactory sensilla were found on the antennae, while abundant gustatory sensilla were recorded on the mouthparts. Three opsin genes (EV_LWop, EV_UVop, EV_Bop) were isolated and found to be mainly expressed in the compound eye compared with other parts of the body...
September 25, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28928673/revisiting-theories-of-humidity-transduction-a-focus-on-electrophysiological-data
#10
Harald Tichy, Maria Hellwig, Wolfgang Kallina
Understanding the mechanism of humidity transduction calls for experimental data and a theory to interpret the data and design new experiments. A comprehensive theory of humidity transduction must start with agreement on what humidity parameters are measured by hygroreceptors and processed by the brain. Hygroreceptors have been found in cuticular sensilla of a broad range of insect species. Their structural features are far from uniform. Nevertheless, these sensilla always contain an antagonistic pair of a moist cell and a dry cell combined with a thermoreceptive cold cell...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28922627/distribution-patterns-and-morphology-of-sensilla-on-the-antennae-of-plutella-xylostella-l-a-scanning-and-transmission-electron-microscopic-study
#11
Xi-Zhong Yan, Cai-Ping Deng, Jiao-Xin Xie, Lan-Jun Wu, Xue-Jun Sun, Chi Hao
The antennal morphology, types of antennal sensilla, fine structures and distributions of the sensilla in Plutella xylostella L. (Lepidoptera: Plutellidae) were studied by scanning (SEM) and transmission (TEM) electron microscopy. The antenna, scape, pedicel and flagellum were all longer in males than in females. A total of seventeen types of sensilla were identified on the antennae: trichodea (two subtypes), basiconica, coeloconica (three subtypes), Böhm's bristles (two subtypes), styloconica (two subtypes), squamiformia, auricillica, furcatea (three subtypes), cupuliform organs and terminal sensory pegs...
September 6, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28904136/neural-evidence-supports-a-dual-sensory-motor-role-for-insect-wings
#12
Brandon Pratt, Tanvi Deora, Thomas Mohren, Thomas Daniel
Flying insects use feedback from various sensory modalities including vision and mechanosensation to navigate through their environment. The rapid speed of mechanosensory information acquisition and processing compensates for the slower processing times associated with vision, particularly under low light conditions. While halteres in dipteran species are well known to provide such information for flight control, less is understood about the mechanosensory roles of their evolutionary antecedent, wings. The features that wing mechanosensory neurons (campaniform sensilla) encode remains relatively unexplored...
September 13, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28889974/ionotropic-receptors-mediate-drosophila-oviposition-preference-through-sour-gustatory-receptor-neurons
#13
Yan Chen, Hubert Amrein
Carboxylic acids are present in many foods, being especially abundant in fruits. Yet, relatively little is known about how acids are detected by gustatory systems and whether they have a potential role in nutrition or provide other health benefits. Here we identify sour gustatory receptor neurons (GRNs) in tarsal taste sensilla of Drosophila melanogaster. We find that most tarsal sensilla harbor a sour GRN that is specifically activated by carboxylic and mineral acids but does not respond to sweet- and bitter-tasting chemicals or salt...
September 25, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28883684/morphological-study-of-the-antennal-sensilla-in-gerromorpha-insecta-hemiptera-heteroptera
#14
A Nowińska, J Brożek
The external morphology and distribution of the antennal sensilla of 21 species from five families of semiaquatic bugs (Gerromorpha) were examined using scanning electron microscopy. Nine main types were distinguished based on their morphological structure: sensilla trichoidea, sensilla chaetica, sensilla leaflike, sensilla campaniformia, sensilla coeloconica, sensilla ampullacea, sensilla basiconica, sensilla placoidea and sensilla bell-mouthed. The specific morphological structure of one type of sensilla (bell-mouthed sensilla) was observed only in Aquarius paludum...
2017: Zoomorphology
https://www.readbyqxmd.com/read/28875566/structure-and-development-of-the-subesophageal-zone-of-the-drosophila-brain-ii-sensory-compartments
#15
Sarah Kendroud, Ali A Bohra, Philipp A Kuert, Bao Nguyen, Oriane Guillermin, Simon G Sprecher, Heinrich Reichert, Krishnaswamy VijayRaghavan, Volker Hartenstein
The subesophageal zone (SEZ) of the Drosophila brain processes mechanosensory and gustatory sensory input from sensilla located on the head, mouth cavity and trunk. Motor output from the SEZ directly controls the movements involved in feeding behavior. In an accompanying paper (Hartenstein et al., ), we analyzed the systems of fiber tracts and secondary lineages to establish reliable criteria for defining boundaries between the four neuromeres of the SEZ, as well as discrete longitudinal neuropil domains within each SEZ neuromere...
September 6, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28864301/the-scolopidial-accessory-organs-and-nebenorgans-in-orthopteroid-insects-comparative-neuroanatomy-mechanosensory-function-and-evolutionary-origin
#16
REVIEW
Johannes Strauß
Scolopidial sensilla in insects often form large sensory organs involved in proprioception or exteroception. Here the knowledge on Nebenorgans and accessory organs, two organs with scolopidial sensory cells, is summarised. These organs are present in some insects which are model organisms for the physiology of mechanosensory systems (cockroaches and tettigoniids). Recent comparative studies documented the accessory organ in several taxa of Orthoptera (bushcrickets, cave crickets, Jerusalem crickets) and the Nebenorgan in related insects (Mantophasmatodea)...
August 29, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28842919/a-map-of-sensilla-and-neurons-in-the-taste-system-of-drosophila-larvae
#17
Anna Rist, Andreas S Thum
In Drosophila melanogaster larvae, the prime site of external taste reception is the terminal organ (TO). Though investigation on the TO's implications in taste perception has been expanding rapidly, the sensilla of the TO have been essentially unexplored. In this study, we performed a systematic anatomical and molecular analysis of the TO. We precisely define morphological types of TO sensilla taking advantage of volume electron microscopy and 3D image analysis. We corroborate the presence of five external types of sensilla: papilla, pit, spot, knob, and modified papilla...
December 15, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28839208/sensory-mutations-in-drosophila-melanogaster-influence-associational-effects-between-resources-during-oviposition
#18
Thomas A Verschut, Mikael A Carlsson, Peter Anderson, Peter A Hambäck
Neighboring resources can affect insect oviposition behavior when the complexity of sensory information obscures information about host resource availability in heterogeneous resource patches. These effects are referred to as associational effects and are hypothesized to occur through constraints in the sensory processing of the insect during host search, resulting into suboptimal resource use. Because the possibilities to study these constraints on naturally occurring animals are limited, we instead used sensory mutants of Drosophila melanogaster to determine the importance of sensory information in the occurrence of associational effects...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28836048/male-antenna-morphology-and-its-effect-on-scramble-competition-in-false-garden-mantids
#19
Anuradhi Jayaweera, Katherine L Barry
Well-developed antennae are crucial for many insects, but especially for scramble competitors, who race to find their mates using female sex cues. In these systems, the ability of males to locate females quickly is thought to be under strong selection. A rarely tested assumption is that males with more sensory structures are able to locate females faster. In the present study, we used the false garden mantid Pseudomantis albofimbriata to investigate male antennal morphology and its effect on male efficiency in finding a mate...
August 23, 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28833941/ultrastructure-and-distribution-of-antennal-sensilla-of-the-chilli-thrips-scirtothrips-dorsalis-hood-thysanoptera-thripidae
#20
Wenjing Zhu, Shihao Zhou, Shijie Wang, Dongyin Han, Junyu Chen, Yueguan Fu
The chilli thrips, Scirtothrips dorsalis Hood, is a serious pest of numerous important vegetable and ornamental crops. Various signals, especially phytochemical cues, determine the behavior of the phytophagous thrips at host selection. The sensory abilities of S. dorsalis are poorly understood although the antennae of adult are known to possess important sensory structures in orther insects. In this study, the morphology, distribution, and ultrastructure of the antennal sensilla of the S. dorsalis were examined by using scanning and transmission electron microscopy...
December 2017: Microscopy Research and Technique
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