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. 1980;81(3):431-7.
doi: 10.1007/BF00368154.

A Drosophila melanogaster cell line tested for the presence of active NORs by silver staining

E Privitera

A Drosophila melanogaster cell line tested for the presence of active NORs by silver staining

E Privitera. Chromosoma. 1980.

Abstract

Silver staining was used to detect active NORs in a Drosophila melanogaster cell line (C1 82) characterized by dimorphic X chromosomes (XXL), one of the two Xs showing a marked increase in heterochromatin where the nucleolar organizer (NO) is located. The Q-banding technique was used to determine the karyotype characteristics of the line. Ag-positive NORs appeared only on structurally changed X chromosomes (XL), both in diploid and tetraploid cells, indicating that rRNA genes of XL are more active or numerous than those on normal homologues. A possible relationship between NOR stainability, the presence of an increased heterochromatic portion and the selective advantage of XXL cells, recurrent in numerous Drosophila female lines, is discussed.

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