Definitions for juvenile hormone
This page provides all possible meanings and translations of the word juvenile hormone
Random House Webster's College Dictionary
any of a class of insect hormones acting to inhibit the molting of an immature insect into its adult form.
Any of a group of sesquiterpene hormones that regulate insect physiology by preventing molting of the exoskeleton and thus development of the larva
Juvenile hormones are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology. JHs regulate development, reproduction, diapause, and polyphenisms. In insects, JH refers to a group of hormones, which ensure growth of the larva, while preventing metamorphosis. Because of their rigid exoskeleton, insects grow in their development by successively shedding their exoskeleton. Juvenile hormones are secreted by a pair of endocrine glands behind the brain called the corpora allata. JHs are also important for the production of eggs in female insects. JH was discovered in 1965 and the molecular structure solved in 1967. Most insect species contain only juvenile hormone III. To date JH 0, JH I, and JH II have been identified only in the Lepidoptera. The form JHB3 appears to be the most important JH in the Diptera, or flies. Certain species of crustaceans have been shown to produce and secrete methyl farnesoate, which is juvenile hormone III lacking the epoxide group. Methyl farnesoate is believed to play a role similar to that of JH in crustaceans.
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