Abstract
1) The distribution pattern of heterochromatin characterized by Giemsa-banding, Quinacrine-banding and DNA-late replication has been studied in a reconstructed karyotype of Vicia faba with all chromosome pairs interdistinguishable. 2) By means of two Giemsa-banding methods both an interstitial and a centromeric Giemsa-banding pattern are described. The former one comprehends 14 “marker” and 18 “additional” bands of lower but characteristic visualization frequencies. The centromeric Giemsa-banding pattern consists of 7 bands, located in the centromeric and in the secondary constrictions of the metaphase chromosomes. Chromosomes with banding patterns intermediate between the interstitial and the centromeric Giemsa-banding have also been observed. 3) Quinacrine-banding revealed 10–12 brightly fluorescent bands and 1–2 regions of dim fluorescence. Most Q-bands occupy chromosomal positions also characterized by interstitial Giemsa bands. 4) The DNA-late replication pattern, analyzed both by autoradiography and by FPG-technique, revealed 9 late replicating chromosome regions; all of these correspond positionally to the sites of interstitial Giemsa bands. 5) The results are discussed with respect to (a) the relationships between the banding- and the DNA-late replication pattern; (b) banding and heterochromatin characteristics; (c) the correlations between the distribution of chromatid aberrations and special types of heterochromatin. — The patterns of heterochromatin distribution found are in basic conformity with the corresponding patterns reported for the standard karyotype of Vicia faba. The heterochromatin type characterized by both Giemsabanding and late replication is characteristic of all those chromosome regions which after mutagen treatments show up as aberration hot spots. Positional correlations between interstitial Giemsa marker bands and chemically induced isochromatid breaks are indicative of preferential aberration clustering in heterochromatin/euchromatin junctions.
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Döbel, P., Schubert, I. & Rieger, R. Distribution of heterochromatin in a reconstructed karyotype of Vicia faba as identified by banding- and DNA-late replication patterns. Chromosoma 69, 193–209 (1978). https://doi.org/10.1007/BF00329918
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DOI: https://doi.org/10.1007/BF00329918