Ecdysteroid synthesis by testes of 5th instars and pupae of the European corn borer,Ostrinia nubilalis(Hubner)
作者:
D.B. GELMAN,
C.W. WOODS,
M.J. LOEB,
A.B. BORKOVEC,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 1989)
卷期:
Volume 15,
issue 3
页码: 177-184
ISSN:0792-4259
年代: 1989
DOI:10.1080/07924259.1989.9672041
出版商: Taylor & Francis Group
关键词: ecdysteroid synthesis;20-hydroxyecdysone;testes;Ostrinia nubilalis
数据来源: Taylor
摘要:
Testes from young fifth instarOstrinia nubilalisproduced very small amounts of ecdysteroids while those from larvae that had purged their gut produced considerably more immunodetectable ecdysteroidin vitro. Larval testes that had fused produced 2.2 times more ecdysteroid than those that remained separate. It was the sheath of the testes rather than the contents that was physiologically active. Synthesis was questionable in testes from day-1 pupae and was not observed in testes from pharate pupae, from day-2 pupae or from pharate adults. Thus, synthesis only occurred at specific times in the life cycle. Ecdysteroid profiles for testes from wandering larvae whose testes had fused showed a net increase in all normally observed ecdysteroids, with the greatest increase being in 20-hydroxyecdysone. For testes from day-1 pupae, the nature of the ecdysteroid profile changed after 24 h of incubation, with some ecdysteroids showing increases and other decreases. There appear to be considerable differences among species regarding the times of testis synthesis and the amounts and nature of the ecdysteroids synthesized.
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