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Lazarovici, P., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel, Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
Shapira, D., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
Pisarev, V., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
Shaaya, E., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
A double‐antibody ecdysone‐specific radioimmunoassay was used to clarify whether the effects on metamorphosis of the juvenile hormone analogue methoprene are correlated with changes in ecdysteroids level. It appears that a small ecdysteroids peak, 5 days before pupation, is responsible for the transition from inhibition to defective metamorphosis. Study of the changes in ecdysteroid titer in last‐instar larvae treated with the JHA 2 days prior to the appearance of the above small ecdysteroids' peak showed an immediate reduction in ecdysteroid level, followed by cyclic, successively reduced titer for about 20 days. After this period the larvae ceased to feed and entered to a diapauselike stage which ended in the death of the larvae. A similar effect on ecdysteroid titer and developmental arrest was exhibited by JHA‐treated first‐instar larvae. The mechanism of the interactions between JHA and ecdysteroid level deserves further investigation. Copyright © 1984 Wiley‐Liss, Inc.
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Ecdysteroid level and the change in sensitivity to a juvenile hormone analogue in Ephestia cautella larvae (Lepidoptera, Phycitidae)
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Lazarovici, P., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel, Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
Shapira, D., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
Pisarev, V., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
Shaaya, E., Division of Stored Products, Agricultural Research Organization, The Volcani Center, Bet-Dagan, Israel
Ecdysteroid level and the change in sensitivity to a juvenile hormone analogue in Ephestia cautella larvae (Lepidoptera, Phycitidae)
A double‐antibody ecdysone‐specific radioimmunoassay was used to clarify whether the effects on metamorphosis of the juvenile hormone analogue methoprene are correlated with changes in ecdysteroids level. It appears that a small ecdysteroids peak, 5 days before pupation, is responsible for the transition from inhibition to defective metamorphosis. Study of the changes in ecdysteroid titer in last‐instar larvae treated with the JHA 2 days prior to the appearance of the above small ecdysteroids' peak showed an immediate reduction in ecdysteroid level, followed by cyclic, successively reduced titer for about 20 days. After this period the larvae ceased to feed and entered to a diapauselike stage which ended in the death of the larvae. A similar effect on ecdysteroid titer and developmental arrest was exhibited by JHA‐treated first‐instar larvae. The mechanism of the interactions between JHA and ecdysteroid level deserves further investigation. Copyright © 1984 Wiley‐Liss, Inc.
Scientific Publication
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