PMID: 14416993Dec 1, 1959Paper

Differential uptake of tritiated thymidine into hetero- and euchromatin in Melanoplus and Secale

The Journal of Biophysical and Biochemical Cytology
A LIMA-DE-FARIA

Abstract

Grasshoppers of the species Melanoplus differentialis were injected with tritium-labelled thymidine. At intervals thereafter autoradiographic stripping film was applied over Feulgen squashes and sections. In this species during early prophase of meiosis the sex chromosome forms a heterochromatic block large enough to be resolved in tritium autoradiographs. A study of the squash preparations reveals that the sex chromosome is synthesizing DNA at a different period of time from the euchromatic autosomes. Since there is a developmental sequence of spermatocyte cysts along the testicular tubes it is possible from the sections to show that the heterochromatin synthesizes DNA later than does the euchromatin. To find out whether the results obtained in Melanoplus were characteristic of heterochromatin in general, young seedlings of rye were grown in a tritiated thymidine solution and Feulgen squashes were made as for Melanoplus. In rye leaf nuclei there is a large block of heterochromatin constituted by the proximal regions of the chromosomes and a euchromatic one formed by the median and distal regions of the same chromosomes. Here also the heterochromatin synthesizes DNA at a different period of time from the euchromatin. It is conc...Continue Reading

References

Oct 16, 1952·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·P M B WALKER, H B YATES
Mar 25, 1959·The Journal of Biophysical and Biochemical Cytology·J G GALL
Jan 1, 1955·The Journal of Biophysical and Biochemical Cytology·D P BLOCH, G C GODMAN

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Citations

Nov 1, 1978·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·A B IordanskyN S Badaev
Feb 16, 1965·Chromosoma·A LIMA DE FARIAM A O'SULLIVAN
Jan 1, 1966·Chromosoma·N O Bianchi, M S De Bianchi
Mar 1, 1971·Hippokrates·G Neuhäuser
Jan 1, 1962·Chromosoma·A LIMA-DE-FARIA, T NORDQVIST
Jan 1, 1971·In Vitro·J H TaylorH L Cunningham
Jan 1, 1976·Mutation Research·P M Aebersold, H J Burki
Sep 15, 1961·Proceedings of the National Academy of Sciences of the United States of America·P S WOODSA SENGUN
Dec 1, 1963·Proceedings of the National Academy of Sciences of the United States of America·J H FRENSTERA E MIRSKY
Jan 1, 1965·Proceedings of the National Academy of Sciences of the United States of America·L BERLOWITZ
May 1, 1965·Proceedings of the National Academy of Sciences of the United States of America·R BraunH P Rusch
Jun 1, 1967·Proceedings of the National Academy of Sciences of the United States of America·M M RhoadesA Ghidoni
May 1, 1970·Proceedings of the National Academy of Sciences of the United States of America·P B Moens
Nov 1, 1961·The Journal of Biophysical and Biochemical Cytology·Y HOTTA, H STERN
Nov 1, 1961·The Journal of Biophysical and Biochemical Cytology·R B PAINTER
Jan 1, 1962·The Journal of Cell Biology·G T RUDKIN, H A GRIECH
Sep 1, 1962·The Journal of Cell Biology·A LIMA-DE-FARIA, K BORUM
Nov 1, 1962·The Journal of Cell Biology·L ATKINSK P DALAL
Dec 1, 1962·The Journal of Cell Biology·I AGRELL, H BERGQVIST
Jan 1, 1963·The Journal of Cell Biology·P S Moorhead, V Defendi
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Oct 1, 1963·Journal of Cellular Physiology·J H TAYLOR

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