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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Montera, Patricia de Azambuja | |
| dc.date.accessioned | 2023-12-22T01:56:45Z | - |
| dc.date.available | 2023-12-22T01:56:45Z | - |
| dc.date.issued | 1981-01-02 | |
| dc.identifier.citation | MONTERA, Patricia de Azambuja. Efeitos da ecdisona e de um análogo de hormônio juvenil sobre o desenvolvimento de ninfas de Rhodnius prolixus STAL, 1859 (Hemiptera, Reduviidae) tratadas com precoceno II. 1981. 77 f. Dissertação (Mestrado em Ciências Veterinárias) - Instituto de Ciências Biológicas e da Saúde Universidade Federal Rural do Rio de Janeiro, Seropédica - RJ, 1981. | por |
| dc.identifier.uri | https://rima.ufrrj.br/jspui/handle/20.500.14407/11759 | - |
| dc.description.abstract | Foram estudados os efeitos do precoceno II, administrado por via digestiva, sobre o desenvolvimento de ninfas do 3º e 4º estádio de R. prolixus. O precoceno, nas concentrações de 10 a 100 µg/ml de sangue, reduziu progressivamente o volume de sangue ingerido (ação "antifeedant") e provocou uma alta mortalidade nas concentrações acima de 30 µg/ml de sangue. O retardamento da ecdise foi dose-dependente e em vários casos os insetos tiveram a muda inibida apesar de ingerirem grande volume de sangue. Grande número de insetos sofreu metamorfose prematura. As características morfológicas destes insetos foram correlacionadas com a duração do ciclo da muda. Os adultos precoces com características "ninfais" se alimentaram e iniciaram a ecdise seguinte. Os insetos com características predominantemente imaginais tiveram uma vida curta e não se alimentaram, apesar de lhes serem oferecidas vá- rias oportunidades de alimentação. O retardamento da ecdise provocado pelo precoceno II foi revertido pela ecdisona; este hormônio não interferiu na produção de metamorfose precoce. Por outro lado, a aplica- ção tópica de um análogo de hormônio juvenil um dia após a alimentação inibiu a produção de metamorfose precoce e reduziu o período de intermuda nestes insetos. O exame microscópico das glândulas protorácicas (GP), corpus allatum (CA) e das células neurossecretoras (CNS) cerebrais, no 10º dia após a alimentação, revelou: a) que as GP 65 estavam atrofiadas) contrariamente ao que ocorria no grupo controle; as células das GP estavam alongadas e apresentavam citoplasma escasso; b) os CA estavam ausentes ou muito atrofiada; c) a CNS do tipo A não apresentavam nenhuma diferença com as células do grupo controle; d) a CNS do tipo A' estavam repletas de material paraldeído-fuccínico enquanto que as do grupo controle estavam vazias. Os resultados sugerem que o precoceno II pode afetar o desenvolvimento de ninfas de R. prolixus, interferindo na produção e/ou liberação de ecdisona e hormônio juvenil. Estes dados são coerentes com a hipótese de que o precoceno II afeta o crescimento de R. prolixus por agir na interação cérebro-CA-GP. | por |
| dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq | por |
| dc.format | application/pdf | * |
| dc.language | por | por |
| dc.publisher | Universidade Federal Rural do Rio de Janeiro | por |
| dc.rights | Acesso Aberto | por |
| dc.subject | Medicina Veterinária | por |
| dc.title | Efeitos da ecdisona e de um análogo de hormônio juvenil sobre o desenvolvimento de ninfas de Rhodnius prolixus STAL, 1859 (Hemiptera, Reduviidae) tratadas com precoceno II | por |
| dc.type | Dissertação | por |
| dc.description.abstractOther | The effects of precocene II, given orally, on the development of third- and fourth-instar larvae of R. prolixus were studied. Precocene, at 10 to 100 µg/ml of blood meal, progressively reduced the amount of blood ingested (antifeedant action) and caused a high mortality in doses higher than 30 µg/ml of blood. Moulting was dependent on the doses of precocene, and in several cases the bugs had the ecdysis prevented despite the ingestion of enough blood. Large number of insects underwent premature metamorphosis. A high correlation between the duration of the moulting cycle and the morphogenetic adultoid was ebtained. Precocious adults with slight imaginal characters were able to feed and initiate the next ecdysis. Adultiforms with distinct imaginal characteristics were short-lived and did not feed despite repeated opportunities. The ecdysis prevention activity of precocene (20 µg /ml) could be counteracted by ecdysone given orally (5 µg /ml) although this hormone did not interfer in the adultiform production. On the other hand, a juvenile hormone analogue applied topically a day after feeding (50 µg/bug) precluded the premature metamorphosis and reduced the intermoulting period in these insects. Microscopic examination of the prothoracic glands (PG), corpus allatum (CA) and neurosecretory cells (NSC), ten days after treatment, revealed: a- the PG, contrarily to 67 the control bugs, were atrophied; the glands cells were elongated and presented a scarce cytoplasm; b- the CA were absent or very much atrophied; c- the NSC of type A did not show any apparent difference with the control group; d- the NSC of type A' accumulated paraldehyde-fuchsin positive material whereas in the control bugs they were empty. The results suggested that precocene II treatment may affect the development of R. prolixus larvae by interfering with the production and/or release of ecdysone and juvenile hormone. Our findings are consistent with the hypothesis that the precocene affect the growth by acting in the brain-CA-PG interactions. | eng |
| dc.contributor.advisor1 | Garcia, Eloi de Souza | |
| dc.contributor.advisor1Lattes | http://lattes.cnpq.br/6564076531735310 | por |
| dc.publisher.country | Brasil | por |
| dc.publisher.department | Instituto de Ciências Biológicas e da Saúde | por |
| dc.publisher.initials | UFRRJ | por |
| dc.publisher.program | Programa de Pós-Graduação em Ciências Veterinárias | por |
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The breakdown of the thoracic gland 77 in the adult insect Rhodnius prolixus. J. Exp. Biol., 32: 485-491. WIGGLESWORTH, V.B. 1959. The control of growth and form. Ithaca, New York, Cornell Unir. Press, p. 140. WIGGLESWORTH, V.B. 1969. Chemical structure and juvenile hormone activity: comparative tests on Rhodnius prolixus. J. Insect Physiol., 15: 73-94. WIGGLESWORTH, V.B. 1970. Insect hormones B. OLIVER & R. BOYD & R. CLARK, Edinburgh. p. 159. WIGGLESWORTH, V.B. 1972. The principles of insect physiology, 7th ed. CHAPMAN & HALL, London. p. 827. WIGGLESWORTH, V.B. & GILLET, J.D. 1934. The function of the antennae in Rhodnius prolixus and the mechanism of orientation to the host. J. Exp. Biol., II: 120-139. $ | por |
| dc.subject.cnpq | Medicina Veterinária | por |
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