Abstract
Summary Under in vitro conditions the excised left and right prothoracic glands of a larva of Locusta migratoria produce similar amounts of ecdysone, as monitored by RIA. When brain-corpora cardiaca extracts from last instar larvae of the same species are added to one of the two glands, its ecdysone production is significantly increased over that of the homologous gland. The stimulation is dose dependent. This in vitro system has been used as an assay to probe the presence of ecdysiotropic factors in brain-corpora cardiaca complexes of larvae and adult females of Locusta migratoria. The results show that the apparent titres of ecdysiotropic factors in these extracts fluctuate during larval development and in adult females. These fluctuations are discussed in relation to our present information on the role of brain and corpora cardiaca in the control of ecdysone synthesis in prothoracic glands and follicle cell epithelia in this species.
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