Abstract
The Ag-AS technique was used for staining the polytene chromosomes of D. melanogaster and D. lummei. Bands were stained dark reddish-brown, interbands light yellow. A toromere was heavily stained on the sixth chromosome of D. lummei. The staining intensity of nucleoli was lower than that of chromosomes. During a prolonged staining ectopic threads and the nonhomogeneous structure of nucleoli were revealed. Pretreatment with RNase caused slight changes in the silver staining pattern of chromosomes; pretreatment with DNase did not result in any visible changes, while after preincubation with proteolytic enzymes chromosome morphology was destroyed. Hyaluronidase and lysozyme removed the silver-reducing components from chromosomes without destroying the general chromosome structure. Each of these two enzymes acts specifically: hyaluronidase affects the morphology of chromosomes, but not nucleoli and bands at heat shock puffs, whereas the action of lysozyme is probably evenly distributed between chromosomes and nucleoli.
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Birstein, V.J. Silver staining of Drosophila polytene chromosomes and the effect of hyaluronidase and lysozyme pretreatment. Genetica 56, 167–173 (1981). https://doi.org/10.1007/BF00057556
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DOI: https://doi.org/10.1007/BF00057556