Hormonal control of induction and termination of diapause in Pieris rapae L.
1989
Park, K.D. | Kim, H.R. (Korea Univ., Seoul (Korea R.). Dept. of Biology)
Non-diapausing larvae and diapausing pupae of Pieris rapae L. were treated with 20-HE and JH, and the concentration of 20-HE and JH in body were also measured to determine mechanisms of diapause induction and termination. When early last instar larvae of non-diapausing stage were injected with 20-HE or JH-I, diapause was not induced in both cases. 20-HE concentration of pre-diapausing last instar larvae was very low, and 20-HE peak of non-diapausing two-day-old pupae was not present in diapausing pupae. There was no difference in concentration of JH-I between diapausing and non-diapausing stages. When early and late diapausing pupae were injected with 20-HE, JH-1, or JH-III, diapause was terminated by 0.1-0.5 micro g of 20-HE, but not by JH-I, or JH-III. The above results indicate that diapause of Pieris rapae was induced by decreas of 20-HE concentration and also terminated by gradual accumulation of 20-HE during diapause process
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