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Expression of juvenile hormone acid O-methyltransferase and juvenile hormone synthesis in Blattella germanica

Insect Science 2018年第5期25卷 787-796页

作者： Claudia V. Dominguez Jose L. Maestro Institute of Evolutionary Biology CSIC-Universitat Pompeu Fabra Barcelona Spain

Juvenile hormone （JH）, a sesquiterpenoid synthetized by the insect corpora allata （CA）, plays critical roles in metamorphosis and reproduction. Penultimate or last step of JH synthesis is catalyzed by juvenile hormone acid O-methyltransferase （JHAMT）. Here we report the cloning and expression analysis of the JHAMT orthologue in the cockroach, Blattella germanica （L.）（BgJHAMT）. BgJHAMT is mainly expressed in CA, with only expression traces in ovary. Three different isoforms, differing in the 3＇-UTR sequence, were identified. Isoform A shows between 35 and 65 times higher expression than B and C in CA from penultimate nymphal instar and adult females. RNAi-triggered knock down of BgJHAMT produces a dramatic reduction of JH synthesis, concomitant with a decrease of fat body viteUogenin expression and basal follicle length. BgJHAMT mRNA levels in CA of females along the gonadotrophic cycle parallel, with a slight advancement, JH synthesis profile. BgJHAMT mRNA levels were reduced in starved females and in females in which we reduced nutritional signaling by knocking down insulin receptor and target of rapamycin （TOR）. Results show that conditions that modify JH synthesis in adult B. germanica females show parallel changes of BgJHAMT mRNA levels and that the JH-specifie branch of the JH synthesis pathway is regulated in the same way as the mevalonate branch. Furthermore, we demonstrate that nutrition and its signaling through the insulin receptor and TOR pathways are essential for activating BgJHAMT expression, which suggests that this enzyme can be a checkpoint for the regulation of JH production in relation to nutritional status.

关键词： Blattella germanica corpora allata JHAMT juvenile hormone nutritionalsignaling

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Effect of exposure to chlorpyrifos on the cuticular and internal lipid composition of Blattella germanica males

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Insect Science 2016年第1期23卷 94-104页

作者： Monika Paszkiewicz Agata Sikora Mieczystawa I. Bogus Emilia Wloka Piotr Stepnowski Marek Golebiowski Laboratory of Natural Products Analysis Department of Environmental Analysis Institute for Environmental and Human Health ProtectionFaculty of Chemistry University of Gdansk ul. Wita Stwosza 63 80-308 Gdansk Institute of Parasitology Polish Academy ofSciences Twarda 51155 00-818 Warszawa Poland

The results of our research on the cuticular and internal lipids of Blattella germanica males provide new information on variation in the composition of the cuticular and internal lipids ofB. germanica males after exposure to the presence of the insecticide. gas chromatography and gas chromatography-mass spectrometry analyses were used to identify and quantify the cuticular and internal lipid composition in males and males exposed to insecticide. There were significantly more acids having an even number of carbon atoms in the molecule, and these were also generally in higher concentrations. The following acids were in a higher concentration： C16：0 and C18：1, C18：2, C18：0. In both males and males exposed to insecticide, 24 fatty acids ranging from C6 to C22 were determined. However, there was a significantly higher content of fatty acids in the surface lipids of B. germanica males after exposure to insecticide. Our results indicate a higher content of n-alkanes, sterols, particularly cholesterol, fatty acids, and fatty acid methyl esters in the B. germanica surface after exposure to chlorpyrifos than in males that were not exposed.

关键词： Blattella germanica chlorpyrifos cockroach cuticular and internal lipid GC-MS

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Synergists action of piperonyl butoxide and S,S,S-tributyl phosphorotrithioate on toxicity of carbamate insecticides against Blattella germanica

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Asian Pacific Journal of Tropical Medicine 2017年第10期10卷 981-986页

作者： Alireza Sanei Dehkordi Yaser Salim Abadi Hasan Nasirian Teymour Hazratian Mohammad Amin Gorouhi Saideh Yousefi Azim Paksa Department of Medical Entomology and Vector Control Faculty of Health Hormozgan University of Medical Sciences Infectious and Tropical Diseases Research Center Hormozgan Health Institute Hormozgan University of Medical Sciences Department of Health Services and Health Promotion School of Health Rafsanjan University of Medical Sciences Molecular Medicine Research Center Rafsanjan University of Medical Sciences Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical Sciences Tabriz University of Medical Sciences Department of Medical Entomology and Vector Control School of Health Kerman University of Medical Sciences Sirjan Faculty of Medical Sciences Kerman University of Medical Sciences Department of Parasitology School of Medicine Kashan University of Medical Sciences

Objective: To determine the synergists action of piperonyl butoxide(PBO) and S,S,Stributyl phosphorotrithioate(DEF) on toxicity of carbamate insecticides against Blattella germanica in Tehran city.Methods: In the current study, German cockroach strains were collected from several hospitals and dormitories in Tehran.At the beginning, different concentrations of bendiocarb and carbaryl(insecticides belong to carbamate group) were determined by surface contact on a susceptible strain.Then, the level of susceptibility and type of resistance mechanisms in the collected strains from contaminated sites to the aforementioned insecticides were studied by using PBO and DEF synergists with different insecticide ratios to synergist(1:0, 1:1, 1:2, 1:3).Results: The DEF synergist along with bendiocarb and carbaryl completely eliminated the resistance in all strains but PBO did not completely eliminate the resistance in the strains of Mofid, Alvand, Valiasr hospitals and Shariati dormitory.Generally, the impact of DEF was observed in the removing resistance more than PBO.Conclusions: In most of these strains, resistance to bendiocarb and carbaryl is completely eliminated by DEF, showing a very high role of estraze enzymes in resistance to bendiocarb and carbaryl.But in most strains PBO does not remove the resistance because other mechanisms, such as reduced cuticle penetration and insensitivity to the acetylcholine esterase enzyme, may be involved.

关键词： Blattella germanica 信仰神人协力合作说者 Bendiocarb 酉维因

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德国小蠊(Blattella germanica)的饲养观察

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医学动物防制 1988年第1期 58-59页

作者：窦桂兰姚逸红中国予防医学科学院流行病学微生物学研究所

德国小蠊是一种世界性的室内害虫,在我国广泛,以饭店、医院、食品厂等处为多见,因这些地方人员流动量大,无形中增加了传入机会,此外,各种食物俱全,营养丰富,温湿度适宜,是它繁殖和栖息的良好场

关键词：宝宝乐德国食性生活周期 Blattella germanica 性差别生长发育幼虫

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Habitat influences on diversity of bacteria found on German cockroach in Beijing

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Journal of Environmental Sciences 2009年第2期21卷 249-254页

作者： FU Xue YE Lefu GE Feng State Key Laboratory of lntegrated Management of Pest Insects and Rodents Institute of Zoology Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100080 China

Cockroaches are worldwide indoor pests carrying microorganisms of medical importance. German cockroaches （Blattella germanica） were sampled in five habitats （hospital, restaurant, office home, and market） in Beijing, and the bacteria were isolated from their external surface and alimentary tract and identified using a Biolog identification system. Cockroach densities significantly differed among habitats （market 〉 home 〉 office 〉 restaurant 〉 hospital）. However, no significant differences in bacterial abundance carried by individual German cockroaches （of either sex） were found among habitats. The bacterial abundance in the gut was significantly higher than that on the surface. There were no significant differences in bacterial species richness observed among habitats, sex, carrying position or their interaction. Cluster analysis showed that cockroach densities and bacterial abundance found in the market differed significantly from the other four habitats. The bacterial diversity was not significantly reduced in sensitive facilities such as hospital and restaurant, even though pesticide and bactericide were more frequently applied there. The implications of these findings were discussed in this article.

关键词： German cockroaches Blattella germanica diversity bacteria

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Lack of repellency of three commercial ultrasonic devices to the German cockroach （Blattodea： Blattellidae）

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Insect Science 2006年第1期13卷 61-66页

作者： FANGNENG HUANG BHADRIRAJU SUBRAMANYAM Department of Entomology Louisiana State University Agricultural Center Baton Rouge Louisiana Department of Grain Science and Industry Kansas State University Manhattan Kansas USA

Three commercial ultrasonic devices （A, B, and C） were tested for their ability to repel the German cockroach, Blattella germanica （L.）（Blattodea： Blattellidae）, in Plexiglas enclosures. Device A generated peak frequencies at 26 kHz and 34 kHz, and produced a 95 ±1 dB sound pressure level （SPL） at 50 cm distance （0 dB = 20 log　10[20 μPa/ 20 μPa]）. Device B generated peak frequencies at 27 kHz and 35 kHz, and produced a 92 ± 4 dB SPL. Device C generated a wide range of frequencies between 28-42 kHz and produced an 88 ±2 dB SPL. Ultrasound from any of the three devices did not demonstrate sufficient repelling ability against the German cockroach in the tests. The result failed to provide evidence that ultrasonic technology could be used as an effective pest management tool to repel or eliminate the German cockroach.

关键词： Blattella germanica ultrasonic devices urban pest management

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