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The Journal of Basic and Applied Zoology
Fig. 6 | The Journal of Basic and Applied Zoology

Fig. 6

From: Gene cloning, recombinant expression, and bioassay of an allatotropin in Spodoptera litura Fabricius (Lepidoptera: Noctuidae)

Fig. 6

Possible targets for allatotropin (AT) in Spodoptera litura adults, associated with vitellogenesis. Solid lines represent known pathways, while broken lines are speculative based on information from other species. The known pathway works through some of the brain factors, such as the allatotropin, to induce JH biosynthesis in the corpora allata, and JH, in turn reaching the ovaries via hemolymph, where it regulates the process of vitellogenesis in the females. While in males, the JH synthesized in CA is transferred to the accessory glands. We hypothesize the transfer of AT by means of spermatophore to the bursa of females during copulation (broken line), in turn reaching the CA either directly or via hemolymph, thus, inducing JH biosynthesis. While the recombinant allatotropin injected into hemolymph may induce JH synthesis in the hemolymph or travel to CA and bring about JH synthesis. (Juvenile Hormone: JH; Allatotropin: AT; Recombinant allatotropin: rAT)

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