CONTROL OF MOLTING IN MANDIBULATE AND CHELICERATE ARTHROPODS BY ECDYSONES
| Autor: | A. Krishnakumaran, H. A. Schneiderman |
|---|---|
| Rok vydání: | 1970 |
| Předmět: |
Ecdysone
medicine.medical_specialty media_common.quotation_subject Cuticle Ecdysterone Apolysis Procambarus Biology chemistry.chemical_compound Crustacea Internal medicine medicine Animals Metamorphosis media_common Cholestanes fungi Metamorphosis Biological Spiders Anatomy Crayfish biology.organism_classification Stimulation Chemical Endocrinology chemistry General Agricultural and Biological Sciences Moulting |
| Zdroj: | The Biological Bulletin. 139:520-538 |
| ISSN: | 1939-8697 0006-3185 |
| Popis: | 1. The ability of ecdysones to induce molting in arthropods other than insects was examined in representatives of both the mandibulate and chelicerate subphyla.2. All five ecdysones tested caused molting in the fresh-water crayfish, Procambarus. Their relative activities were: ecdysterone > inokosterone > α ecdysone > ponasterone A > cyasterone. Doses as low as 3 µg/g of ecdysterone caused 100% of all test crayfish to undergo apolysis and secrete a new cuticle within 14 days after injection, but only in a few cases did the animals shed their old cuticles spontaneously after experimental treatment. At higher doses the new cuticle was thinner than normal and had abnormal bristles. The stimulation of molting was specific for ecdysones and was not copied by a variety of ecdysone analogues or other steroids.3. Histological and autoradiographic studies revealed that ecdysterone at the levels used in these experiments caused molting in crayfish without DNA replication.4. Ecdysterone also caused molting in the ma... |
| Databáze: | OpenAIRE |
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