Folia Geobotanica

, Volume 40, Issue 4, pp 367–384 | Cite as

Genome size discriminates between closely related taxaElytrigia repens andE. intermedia (Poaceae: Triticeae) and their hybrid

  • Václav Mahelka
  • Jan Suda
  • Vlasta Jarolímová
  • Pavel Trávníček
  • František Krahulec
Article

Abstract

Flow cytometric and karyological investigations were performed on the closely related taxaElytrigia repens andE. intermedia (Poaceae: Triticeae) from the Czech Republic. DNA-hexaploids clearly prevailed among 238 examined plants and amounted to 96.2% of all samples. 2C-values ± s.d. for hexaploidElytrigia repens andE. intermedia were estimated at 23.27 ± 0.20 pg and 27.04 ± 0.24 pg respectively. Genome size thus allowed reliable separation of the two species (difference ca. 16%) as well as the identification of hybrid individuals. Natural hybridization inE. repens — E. intermedia alliance seems to be quite a common phenomenon as indicated from a large proportion (one sixth) of hexaploid samples with intermediate 2C-values. Previously, the crosses were most probably overlooked or misidentified due to their weak morphological differentiation. New nonaploid cytotypes (2n=9x=63) were revealed for both species as well as for the hybrid (determined on the basis of morphological characters only), representing the first records from the field. Fusion of unreduced and reduced gametes of the hexaploids is the most plausible mode of nonaploid origin.

Keywords

C-value Chromosome number Cytotype DNA content Flow cytometry Hybridization Nonaploid Wheatgrass 

Nomenclature

Löve 1984 

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Copyright information

© Institute of Botany, Academy of Sciences of the Czech Republic 2005

Authors and Affiliations

  • Václav Mahelka
    • 1
  • Jan Suda
    • 1
    • 2
  • Vlasta Jarolímová
    • 1
  • Pavel Trávníček
    • 1
    • 2
  • František Krahulec
    • 1
  1. 1.Institute of BotanyAcademy of Sciences of the Czech RepublicCzech Republic
  2. 2.Department of BotanyCharles UniversityPragueCzech Republic

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