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Science 20 April 1973:
Vol. 180. no. 4083, pp. 307 - 308
DOI: 10.1126/science.180.4083.307
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Articles

26-Hydroxyecdysone: New Insect Molting Hormone from the Egg of the Tobacco Hornworm

J. N. Kaplanis 1, W. E. Robbins 1, M. J. Thompson 1, and S. R. Dutky 1

1 Insect Physiology Laboratory, Plant Protection Institute, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, Maryland 20705

Five kilograms of tobacco hornworm eggs (48 to 64 hours old) afforded 26.5 milligrams of a new crystalline insect molting hormone identified as 26-hydroxyecdysone. The three known insect ecdysones—agr-ecdysone, 20-hydroxyecdysone, and 20,26-dihydroxyecdysone—were also present but in much smaller quantities. The new hormone is the predominant molting hormone in the hornworm during this stage of embryonic development. These results takent in context with the current knowledge of the chemistry and biochemistry of the molting hormones during postembryonic development in the hornworm indicate quantitative and qualitative differences in the biosynthetic-mnetabolic pathways as well as in the ecdysones in different developmental stages of this insect.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
JH Zero: New Naturally Occurring Insect Juvenile Hormone from Developing Embryos of the Tobacco Hornworm.
B. J. BERGOT, G. C. JAMIESON, M. A. RATCLIFF, and D. A. SCHOOLEY (1980)
Science 210, 336-338
   Abstract »    PDF »
2-Deoxy-alpha-ecdysone from ovaries and eggs of the silkworm, Bombyx mori.
E Ohnishi, T Mizuno, F Chatani, N Ikekawa, and S Sakurai (1977)
Science 197, 66-67
   Abstract »    PDF »


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