Abstract
Since sending this paper to press a few reports of great interest have been brought to the author’s notice. It was shown by Clever and Karlson (1960) that the injection of pure ecdysone into Chironomus larvae caused prompt and characteristic changes in the puffing pattern of the chromosome, similar to those that occur at pupation. Further, Clever (1961) reported that the puffing of a few gene loci in the chromosomes appears 15 to 30 minutes after the injection of the ecdysone and also that the size of the induced puff and duration of its presence have a correlation with the dosage of hormone injected. With a higher dosage they are larger and last longer. In view of the report that at pupation and metamorphosis different gene loci show the puffs it may be presumed that juvenile hormone somehow prevents the activation of the genes that should normally puff up at metamorphosis, during the larval and pupal moults. This indicates that the hormone ecdysone may act directly on the nucleus. And in view of the fact that puffs appear to indicate increased metabolic activity in particular chromosomal regions (Pavan, 1959) it may be that ecdysone acts at the nuclear level activating particular chromosomal regions “to bring about the elaboration of specific substances (ribonucleic acids, nucleotide enzymes ?) that are destined to participate personally in the cytoplasmic synthesis that characterise moulting” as was already predicted by Schneiderman and Gilbert (1959). A report of interest in this connection is that of Abd-el-Wahab and Sirlin (1959) who suggest that decrease in the synthesis of nuclear RNA in prothoracic glands in Drosophila is responsible for decrease in the moulting hormone titre thereby indicating that a nuclear product (RNA or RNA-template) is involved in the synthesis of ecdysone.
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References
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Krishnakumaran, A. (1962). Note added in proof to page 92 Endocrine Control of Metabolism in Arthropods. In: Autrum, H., et al. Ergebnisse der Biologie. Ergebnisse der Biologie Advances in Biology, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-94837-4_8
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