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- W2089111036 abstract "Juvenile hormone (JH) synthesis by the corpora allata of gregarious and solitarious phase females of Schistocerca gregaria was determined in vitro during the penultimate and last stadia as well as during the first gonotrophic period of adults. Generally, the corpora allata of solitarious females showed higher rates of JH synthetic activity. In addition, in adult females there was a temporal difference between the corpora allata activities of gregarious and solitarious locusts, the latter exhibiting relatively higher rates of JH synthesis early in the first gonotrophic period. The corpus allatum volumes of solitarious females were also generally larger than those of their gregarious counterparts; there was no synchrony between fluctuations in JH synthetic activity and changes in corpus allatum volume in either phase.The early onset of relatively high JH synthetic rates in solitarious females was correlated with the early detection, by rocket immunoelectrophoresis, of vitellogenin in the haemolymph and vitellin in the oocytes. Vitellogenin appeared in the haemolymph on day 4 in solitarious females and on day 6 in gregarious females and vitellin appeared in the oocytes on days 6 and 8 respectively. Oocyte length at which vitellogenesis was first detected was 1.8 mm for gregarious and 1.3 mm for solitarious females. However, despite the accelerated onset of both vitellogenin synthesis and uptake, oocyte maturation time of solitarious females was longer. In both gregarious and solitarious females, vitellogenin titres increased until oocytes reached a length of about 4 mm and declined thereafter. Vitellin content of ovaries increased proportionately to oocyte growth until they attained a length of 5.0 mm. The subsequent increase in length of oocytes to maturity is attributed to postvitellogenic growth, possibly by hydration." @default.
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- W2089111036 date "1981-01-01" @default.
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- W2089111036 title "Phase polymorphism in Schistocerca gregaria: Assessment of juvenile hormone synthesis in relation to vitellogenesis" @default.
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- W2089111036 doi "https://doi.org/10.1016/0022-1910(81)90129-3" @default.
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