Hormonal control of egg maturation in the corn earworm, Heliothis zea
| Autor: | J. H. Yu, Govindan Bhaskaran, Kotamraju Satyanarayana, Roger W. Meola, Karl H. Dahm |
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| Rok vydání: | 1991 |
| Předmět: |
medicine.medical_specialty
media_common.quotation_subject Methoprene Biology biology.organism_classification Lepidoptera genitalia chemistry.chemical_compound Endocrinology chemistry Insect Science Internal medicine Juvenile hormone medicine Noctuidae Mating Reproduction Corpus allatum Ecology Evolution Behavior and Systematics media_common Hormone |
| Zdroj: | Entomologia Experimentalis et Applicata. 59:135-143 |
| ISSN: | 0013-8703 |
| Popis: | At eclosion, the ovaries of female Corn earworm Heliothis zea do not contain mature eggs. Virgin-unfed females produced approximately 400 mature eggs in 8 days; mating or feeding doubled this number, and mating plus feeding more than tripled it. Females allatectomized or decapitated at day 0 matured few eggs. Egg production was restored by implantation of active corpora allata (CA) or by treatment with the juvenile hormone (JH) analogue methoprene at day 0. 20-Hydroxyecdysone, on the other hand, had no effect. Females in which the CA had been denervated or in which the median neurosecretory cells of the brain had been ablated at day 0 produced fewer eggs than sham-operated animals. These results indicate that egg maturation is controlled by JH and that continuous input from the brain is required for sustained CA activity for maintaining a high rates of egg maturation. The rate of JH biosynthesis by CA in vitro was determined with a radiochemical assay. The major hormones produced were JH-II and JH-III with small quantities of JH-I. The rates of JH synthesis were similar in all experimental groups which may indicate that the in vitro rate of JH synthesis does not reflect the actual state of CA activity in the female. |
| Databáze: | OpenAIRE |
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