Skip to main content
SpringerLink
Log in

Structure of and homology between pachytene and somatic metaphase chromosomes of the tomato

  • Published:
Genetica Aims and scope Submit manuscript

Abstract

The pachytene and somatic metaphase chromosomes of tomato are structurally differentiated into proximal chromatic and distal achromatic parts. The pachytene chromosomes have very clear and characteristic chromosome markers, with the help of which all 12 bivalents can be clearly identified. Based on the size, the arm ratio, the ratio of chromatic parts and the presence and size of achromatic parts, all 12 pairs of somatic chromosomes can also be identified, and each pair be homologised with the corresponding pachytene bivalent. A comparison of the lengths of chromatic and achromatic parts of pachytene chromosomes with the chromatic and achromatic parts of the corresponding somatic chromosomes indicate, that, on an average, the chromatic parts are contracted by a factor of 4 to 5, whereas the achromatic parts are contracted by a factor of 30. The heteropycnosis near the centromere in tomato chromosomes therefore is not a special characteristic of meiotic chromosomes, but present in somatic metaphase chromosomes also.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Barton, D. W. (1950). Pachytene morphology of the tomato chromosome complement.Amer. J. Bot.,37: 639–643.

    Google Scholar 

  • Brown, S. W. (1949). The structure and meiotic behaviour of differentiated chromosomes of tomato.Genetics 34: 437–461.

    Google Scholar 

  • Darlington, C. D. (1937). Recent advances in cytology. J. & A. Churchill, London, England.

    Google Scholar 

  • Gottschalk, W. (1951). Untersuchungen am Pachytän normaler und röntgenbestrahlter Pollenmutterzellen vonSolanum Lycopersicum.Chromosoma 4: 298–341.

    PubMed  Google Scholar 

  • Gottschalk, W. (1958). Untersuchungen über die Variabilität der Struktur von Pachytänchromosomen.Ber. Dtsch. Bot. Ges. 71: 381–398.

    Google Scholar 

  • Japha, B. (1939). Die Meiosis vonOenothera II.Z. Bot. 34: 321–369.

    Google Scholar 

  • Khush, G. S., C. M. Rick &R. W. Robinson (1964). Genetic activity in a heterochromatic chromosome segment.Science 145: 1432–1434.

    Google Scholar 

  • Lesley, M. M. &J. W. Lesley (1935). Heteromorphic A-chromosomes of tomato differing in satellite size.Genetics 20: 568–580.

    Google Scholar 

  • Lima-de-Faria, A. &P. Sarvella (1962). Variation of the chromosome phenotype inZea, Solanum andSalvia.Chromosoma 13: 300–314.

    Google Scholar 

  • Rick, C. M. &G. S. Khush (1964). Chromosome engineering inLycopersicon. In: Chromosome Manipulations and Plant Genetics, 8–20, Ed.R. Riley &K. R. Lewis. Oliver & Boyd, Edinburgh & London.

    Google Scholar 

  • Smith, S. G. (1952). The evolution of heterochromation in the GenusTribolium (Tenebrionidae: Coleoptera).Chromosoma 4: 585–610.

    PubMed  Google Scholar 

  • Sybenga, J. (1964). Accurate chromosome measurements with the Camera Lucida.Zeitsch. Wiss. Mikrosk. u. Mikrosk. Techn. 65: 437–439.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Genetics, Agricultural University, Wageningen, The Netherlands

    M. S. Ramanna & R. Prakken

Authors
  1. M. S. Ramanna
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. R. Prakken
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

This study was part of a project resulting from a contract between the AssociationEuratom-I.T.A.L. and the Agricultural University of Wageningen.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ramanna, M.S., Prakken, R. Structure of and homology between pachytene and somatic metaphase chromosomes of the tomato. Genetica 38, 115–133 (1967). https://doi.org/10.1007/BF01507452

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01507452

Keywords

Search

Navigation