Abstract
WHEN some insect eggs are treated with a synthetic analogue of juvenile hormone the resulting larvae grow normally, but much later their metamorphosis may be inhibited, so that they develop into intermediates or even extra larval instars1,2. This has been interpreted by Riddiford and Williams1 as indicating “that the hormonal materials are able to interfere with the programming or latent storage of information for postembryonic development”. An alternative explanation is that there is an excess of juvenile hormone in the insect at metamorphosis, a situation which could have two causes: either the embryonic brain or corpora allata could have been directly affected by the hormone analogue so that secretion of juvenile hormone was abnormally prolonged2,3 or the applied hormone could simply have persisted throughout growth until metamorphosis.
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References
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WILLIS, J., LAWRENCE, P. Deferred Action of Juvenile Hormone. Nature 225, 81–83 (1970). https://doi.org/10.1038/225081b0
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DOI: https://doi.org/10.1038/225081b0
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