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Chromosomal DNA variation in Cucumis.

C Ramachandran1, R K Narayan

  • 1Department of Agricultural Botany, University College of Wales, Penglais, Aberystwyth, SY23 3DD, Dyfed, Wales, Great Britain.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 21, 2013
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Summary
This summary is machine-generated.

Nuclear DNA content varies significantly across Cucumis species, with tetraploids having double the DNA of diploids. Speciation in Cucumis involves DNA changes across all chromosomes, proportional to their size.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Evolutionary biology

Background:

  • Nuclear DNA content is a fundamental characteristic of species.
  • Understanding DNA variation in Cucumis can shed light on its evolutionary history.
  • Previous studies have not comprehensively surveyed DNA amount variation across Cucumis species.

Purpose of the Study:

  • To quantify and compare nuclear DNA amounts in different Cucumis species.
  • To investigate the relationship between DNA content, ploidy level, and chromosome characteristics.
  • To explore the role of DNA changes in the speciation of Cucumis.

Main Methods:

  • Flow cytometry was used to measure nuclear DNA amounts (2C DNA content) in various Cucumis species.
  • Chromosome numbers and volumes were analyzed in conjunction with DNA content.
  • DNA amount distributions across different chromosomes were examined.

Main Results:

  • Nuclear DNA amounts ranged from 1.373 to 2.483 pg in diploids and 2.846 to 3.886 pg in tetraploids.
  • Tetraploids exhibited approximately double the DNA content of diploids.
  • A positive linear correlation was observed between nuclear DNA amounts and chromosome volume.
  • Quantitative DNA changes during speciation affected all chromosomes, but to varying degrees, suggesting amplification or diminution proportionate to chromosome size.

Conclusions:

  • Ploidy level is a major determinant of nuclear DNA content in Cucumis.
  • Speciation in Cucumis is associated with genome-wide quantitative DNA alterations.
  • Chromosome size appears to be a factor influencing the magnitude of DNA changes during speciation.