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Arquivos do Instituto Biológico

On-line version ISSN 1808-1657

Arq. Inst. Biol. vol.79 no.1 São Paulo Jan./Mar. 2012

https://doi.org/10.1590/S1808-16572012000100013 

ARTIGO CIENTÍFICO

 

Desenvolvimento e produção de seda do Bombyx mori L. exposto a análogos do hormônio juvenil

 

Development and silk production of the silkworm Bombyx mori L. exposed to juvenile hormone analogues

 

 

J.E. MirandaI; S.A. De BortoliII; R. TakahashiII

IEmbrapa Algodão, Núcleo do Cerrado, Rodovia BR 153, km 4, CEP 74001-970, Goiânia, GO, Brasil. E-mail: miranda@cnpa.embrapa.br
IIUniversidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP, Brasil

 

 


RESUMO

O crescimento dos insetos é regulado por um complexo hormonal que inclui o hormônio juvenil, que assegura ao inseto a retenção de suas características larvais, prevenindo a maturação. A aplicação de análogos do hormônio juvenil em Bombyx mori tem promovido o incremento da produção de seda; entretanto, altas doses podem provocar efeitos deletérios sobre a biologia do inseto. Este estudo avaliou a pulverização de diferentes análogos do hormônio juvenil sobre o bicho-da-seda e seus efeitos sobre o desenvolvimento larval e a produção de seda. Lagartas foram expostas a piriproxifeno, metopreno e fenoxicarbe a doses de 20, 2 e 0,02 ppb de ingrediente ativo, respectivamente, através da pulverização dos insetos e do alimento a 48 horas após a quarta ecdise. A administração de análogos do hormônio juvenil promoveu aumentos no período larval, massa de glândulas sericígenas, peso de casulos e de pupas. Os produtos testados afetaram negativamente a taxa de encasulamento. Metopreno promoveu o maior incremento na produção de seda e menor taxa de mortalidade, podendo seu uso ser recomendado na sericicultura.

Palavras-chave: Sericicultura, piriproxifeno, metopreno, fenoxicarbe, neotenin.


ABSTRACT

Insect growth is regulated by a hormonal complex that includes the juvenile hormone, which assures to the insect the retention of its larval characteristics, preventing maturation. Applications of juvenile hormone analogues on Bombyx mori have induced increases in silk production; however, high doses may promote deleterious effects on the biology of the insect. The present study evaluated the spraying of different juvenile hormone analogues on the silkworms and their effects on the larval development and silk production. Larvae were exposed to piryproxyfen, methoprene and fenoxycarb at titers of 20, 2 and 0.02 ppb a.i., respectively, sprayed on the insects and food at 48 hours after the fourth ecdysis. The administration of juvenile hormone analogues promoted increases in the larval period, silk glands, cocoon and pupae weight. The tested products had a negative effect on the cocooning rate. Methoprene promoted a larger increment in the silk production and smaller fall in the cocooning rate, and its use can be recommended in sericulture.

Key words: Sericulture, pyriproxyfen, methoprene, fenoxycarb, neotenin.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

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Recebido em 17/8/10
Aceito em 14/3/12

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