Interaction of cyclic nucleotides and ecdysterone in breaking the pupal diapause of the bertha armyworm, Mamestra configurata WLK. |
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Authors: | R P Bodnaryk |
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Institution: | Canada Department of Agriculture, Research Station, 25 Dafoe Road, Winnipeg, Manitoba, Canada. R3T 2M9 |
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Abstract: | Cyclic GMP and cyclic AMP have distinct and opposite effects upon the action of ecdysterone in diapausing pupae of the Bertha armyworm, . Cyclic GMP enhanced the effectiveness of suboptimal doses of ecdysterone in breaking diapause; the amount of cyclic GMP required to lower the ED50 of ecdysterone by half was 80 μg/g. Dibutyryl cyclic GMP had no apparent effect on the action of ecdysterone over a wide dose range (0.07 – 70 μg/g). On the other hand, cyclic AMP and dibutyryl cyclic AMP effectively blocked the diapause-breaking action of ecdysterone when administered simultaneously with the steroid hormone. The amount of cyclic AMP required to reduce the incidence of diapause termination from 100% to 50% was 60 μg/g; for dibutyryl cyclic AMP the amount required was only 14 μg/g. No cyclic nucleotide tested in the study could by itself break the pupal diapause of . The concept that cyclic GMP and cyclic AMP provide at least different if not opposing regulatory influences in certain insect systems is discussed briefly in the light of these observations. |
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