Wax secretion in non-diapausing and diapausing pupae of the tobacco hornworm, Manduca sexta |
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Authors: | RA Bell DR Nelson TK Borg DL Cardwell |
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Institution: | 1. Metabolism and Radiation Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Fargo, North Dakota 58102, U.S.A.;2. Division of Natural Sciences, North Dakota State University, Fargo, North Dakota 58102, U.S.A. |
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Abstract: | Scanning electron microscopy of the epicuticle of the tobacco hornworm, Manduca sexta, showed that pupae in diapause possess thicker wax layers than non-diapausing pupae. Extractions of the epicuticle with CHCl3 established that diapausing pupae secreted over three times as much wax as non-diapausing pupae, and that the total period of wax secretion in diapausing pupae was two to three times longer than that of non-diapausing pupae. Apparently, the extra thickness of the wax layer of diapausing pupae protects the insect from desiccation during diapause. The deposition of additional wax may result from hormonal changes accompanying entry into diapause. |
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