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Rare recent natural hybridization in Hieracium s. str. – evidence from morphology, allozymes and chloroplast DNA

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Abstract

The first proven data on natural hybridization in the genus Hieracium s. str. are presented. Plants with intermediate morphological characters between the diploids H. alpinum and H. transsilvanicum were found in the Muntii Rodnei (Romanian Eastern Carpathians) in 2001 and in the Chornohora Mts (Ukrainian Eastern Carpathians) in 2003. While plants of intermediate morphology between usually so called basic species are usually tri- or tetraploid in Hieracium s. str., these plants were diploid (2n=18) like both parental species in this region. The Romanian plant did not produce fertile achenes in free pollination and in control backcrosses with H. transsilvanicum, two hybrids from Ukraine were completly seed sterile in free pollination and reciprocal crosses. Pollen stainability as an indirect measure of male fertility was quite high in the studied Ukrainian hybrid plants and similar to the parental taxa. Evidence from allozyme analysis also confirmed the hybrid origin of the studied plants. Sequencing and PCR-RFLP analyses of the trnT-trnL intergenic spacer revealed that all hybrid plants had the H. transsilvanicum chloroplast DNA haplotype. Maternal inheritance of chloroplast DNA in this particular cross was proved with artificial hybrids from reciprocal experimental crosses between H. alpinum and H. transsilvanicum. In both localities, the natural hybrid plants were found in disturbed habitats, exceptionally allowing contact of the otherwise ecologically vicariate parental species. Morphologically, the hybrid plants belong to H. × krasani Woł.

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Authors and Affiliations

  1. Institute of Biology & Ecology, Faculty of Science, P. J. Safárik University, Mánesova 23, 04154, Kosice, Slovakia

    P. Mráz

  2. Institute of Botany, Slovak Academy of Sciences, Dúbravskácesta 14, 84523, Bratislava, Slovakia

    P. Mráz

  3. Institute of Botany, Academy of Sciences of the Czech Republic, 252 43, Průhonice, Czech Republic

    J. Chrtek, J. Fehrer & I. Placková

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  1. P. Mráz
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Mráz, P., Chrtek, J., Fehrer, J. et al. Rare recent natural hybridization in Hieracium s. str. – evidence from morphology, allozymes and chloroplast DNA. Plant Syst. Evol. 255, 177–192 (2005). https://doi.org/10.1007/s00606-005-0329-1

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