Genetica

, Volume 85, Issue 3, pp 241–247

Quantitative nuclear DNA differences associated with genome evolution in Guizotia (Compositae)

  • S. C. Hiremath
  • H. N. Murthy
  • S. S. Salimath
Article

DOI: 10.1007/BF00132276

Cite this article as:
Hiremath, S.C., Murthy, H.N. & Salimath, S.S. Genetica (1992) 85: 241. doi:10.1007/BF00132276

Abstract

The present communication deals with 2C nuclear genome size variation in a fairly small genus Guizotia. Twenty-four accessions belonging to six species, out of seven known, were analysed in order to elucidate the extent of DNA variation both at an intra—as well as interspecific level. At the intraspecific level none of the species exhibited significant differences in their genome size. Between the species, the 2C DNA amounts ranged from 3.61 pg in G. reptans to 11.37 pg in G. zavattarii; over three-fold DNA variation is evident. Apparently these interspecific DNA differences have been achieved independent of the numerical chromosomal change(s), as all the Guizotias share a common chromosome number 2n=2x=30. The cultivated oilseed crop, G. abyssinica (7.57 pg), has accommodated nearly 78% extra DNA in its chromosome complement during the evolutionary time scale of its origin and domestication from the wild progenitor G. schimperi (4.25 pg). The extent of genomic DNA difference(s) between the species has been discussed in the light of their interrelationships and diversity.

Key words

Compositae DNA amount evolution Guizotia karyotype 

Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • S. C. Hiremath
    • 1
  • H. N. Murthy
    • 1
  • S. S. Salimath
    • 1
  1. 1.Department of BotanyKarnatak UniversityDharwadIndia
  2. 2.Department of BotanyUniversity of DelhiDelhiIndia

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