Further studies of the effect of L-canavanine on the tobacco hornworm, Manduca sexta. |
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Authors: | D L Dahlman G A Rosenthal |
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Affiliation: | 1. Department of Entomology, University of Kentucky, Lexington, Kentucky 40506, U.S.A.;2. T. H. Morgan School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506, U.S.A. |
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Abstract: | Fifth instar Manduca sexta growth response to injected doses of canavanine was concentration-dependent over a range of 0·5 to 2·0 mg/g body weight. Twenty-four hr after injection of 14C-guanidinooxy-d,l-canavanine, M. sexta larvae incorporated approximately 3·6% of the labelled l-canavanine into protein of non-gut tissue. Adult M. sexta mortality was related to the level of injected canavanine over a range of 2 to 8 mg/g body weight. Injection of as little as 2 mg canavanine/g body weight caused hyperactivity in adult M. sexta. Arginine, able to negate the toxic effects of canavanine during larval growth, was only marginally capable of overcoming canavanine effects on larval-pupal ecdysis. |
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