Abstract
JUVENILE HORMONE (JH) has been shown to control the synthesis and storage of a diapause-associated protein (DAP) in the larval fat body of the southwestern corn borer, Diatraea grandiosella Dyar1. Our results indicate that DAP is synthesised de novo in pre-diapausing southwestern corn borers, reaches a maximum titre in newly diapaused larvae, and is used gradually during diapause. In addition, we have demonstrated recently that the protein has a molecular weight of about 35,000, and an isoelectric point of about 5.9 (unpublished). Since JH controls the larval diapause of this insect2,3, DAP may be involved in diapause maintenance. Some properties of DAP are described here and the evidence for its function is appraised. Possible functions include a nutritive store of amino acids or peptides, a reservoir of a proenzyme, or a JH-binding protein. From the available evidence, the most likely model is that of a latent store of a high affinity JH-binding protein4–7 which is released and activated during diapause.
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TURUNEN, S., CHIPPENDALE, G. Possible function of juvenile hormone-dependent protein in larval insect diapause. Nature 280, 836–838 (1979). https://doi.org/10.1038/280836a0
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DOI: https://doi.org/10.1038/280836a0
