Abstract
Summary The male accessory reproductive glands (ARG) of Chilo partellus show the presence of certain protein fractions which are immunologically identical with larval haemolymph proteins (LHPs). The uptake of radiolabelled haemolymph proteins obtained from the mid-last instar larvae by the male ARG has been studied here. The results show that the ARGs sequester both the LHPs (LHP 1 and LHP 2) in vitro and this uptake is stimulated by 20-hydroxyecdysone as well as by its agonist, RH 5849. When the ARGs are co-cultured with 35S methionine-labelled fat body of mid-last instar larvae in the presence of 20-hydroxyecdysone, there is an increased uptake of LHPs along with a few other polypeptide fractions. In vitro culture of ARG followed by fluorographic analysis reveals that the ARGs synthesise large number of polypeptides but those which co-migrate with the LHPs are absent.
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