The anti-juvenile hormone action of cycloheximide (RNA and protein synthesis inhibitor) in some nymphal instars of, Schistocerca Gregarra (Forskal) [electronic resource].

Includes references.

Topical application of RNA and protein synthesis inhibitor, cycfohexim ide (3; 2 (3, 5-Dimethyl -1- 2 -oxocycfohexyl) -2 -hydroxy ethyl glutarimide) to 0-24 H-old fourth instar female nymph, Schistocerca gregaria (Forskal) revealed that, biological activities are dose dependent. This treatment induced three types of responses: the high doses resulted in different percentages of the permanent fourth instar nymphs, the low doses produced precocious adults, meanwhile the lower doses, especially 30 ug/insect, inhibited the metamorphosis completely. C16-JH extra cycloheximide therapy restored the normal development and metamorphosis of the resulting fifth instar nymphs, which confirm that the last two types of response are related to juvenile hormone (JH) deficiency as a result of anti-JH action of cycloheximide. On the other hand, the lowest doses of this compound (20, and 10 µg /insect) had produced the solitary green colour in the resulting fifth instar nymphs, that considered as an indicator for the high level of JH in their haemolymph. Owing to these obtained results agreed with the dual effect of anti- JH (precocene II), cycloheximide acts as anti- JH in S. gregaria.

Summary in Arabic.

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