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Haemolymph ecdysteroids in the solitary and gregarious larvae of Schistocerca gregaria

✍ Scribed by Amer I. Tawfik; Anna Mat'hová; František Sehnal; Sayed H. Ismail

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
741 KB
Volume
31
Category
Article
ISSN
0739-4462

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✦ Synopsis

I n the penultimate and last instar larvae of Schistocerca gregaria, 20hydroxyecdysone (20E) makes up 7484% of detected ecdysteroids i n the females, and 63-74% i n the males. Remaining ecdysteroids include ecdysone, a compound with HPLC and TLC retention times of makisterone A, and highly polar metabolites. Except for the last instar females, the contents of ecdysone and the unknown compound are higher in the solitary phase, while that of polar metabolites is higher in the gregarious phase. The phases also differ in that the molt-inducing ecdysteroid peaks last longer i n the gregarious than in the solitary larvae. Peak concentrations reach 3.0-4.0 yg 20E equiv./ml in penultimate female instar, 2.5-3.0 pg/ml i n penultimate male instar, and 1.5-2.0 pg/ml in the last larval instar of both sexes. o 1996 WiIey-Liss, Inc.

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