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ecdysone

A Dictionary of Biology | 2004 | Copyright

ecdysone A steroid hormone, secreted by a pair of prothoracic glands in the thorax of insects and by Y organs in crustaceans, that stimulates moulting (see ecdysis) and metamorphosis. In insects its release is stimulated by prothoracicotropic hormone. It acts on specific gene loci, stimulating the synthesis of proteins involved in these bodily changes. Some plants contain phytoecdysones, which are structurally similar to the insect ecdysones. They may help to protect the plant by interfering with the moulting cycle of insect pests that consume plant tissue.

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Related entries from encyclopedias, dictionaries, and thesauruses

	ecdysone Book article from: A Dictionary of Zoology ecdysone A hormone , produced by the prothoracid glands, which brings about moulting in an insect. The form of the animal after each moult is determined by the juvenile hormone . Ecdysone acts mainly on the epithelial cells.
	Molting Book article from: Animal Sciences ...form the integument of an arthropod. The molting process is a series of steps. It is controlled by the hormone ecdysone . Ecdysone is secreted from glands behind the brain. Once it is released the molting process begins. The arthropod builds...
	prothoracic gland Book article from: A Dictionary of Biology prothoracic gland See ecdysone .
	phytoecdysone Book article from: A Dictionary of Biology phytoecdysone See ecdysone .
	ecdysis Book article from: A Dictionary of Biology ...This cuticle is then hardened with chitin and lime salts. In insects and crustaceans ecdysis is controlled by the hormone ecdysone . See also eclosion hormone ; ecdysis-triggering hormone . 2. The periodic shedding of the outer layer of the epidermis...