Natural hybridisation in birch: triploid hybrids between Betula nana and B. pubescens

@article{Anamthawatjnsson2004NaturalHI,
  title={Natural hybridisation in birch: triploid hybrids between Betula nana and B. pubescens},
  author={Kesara Anamthawat-j{\'o}nsson and Aegir Th{\'o}r Th{\'o}rsson},
  journal={Plant Cell, Tissue and Organ Culture},
  year={2004},
  volume={75},
  pages={99-107}
}
Hybridisation between diploid (2n=28) dwarf birch Betula nana L. and tetraploid (2n=56) downy birch B. pubescens Ehrh. has occurred in natural populations in Iceland. About 10% of birch plants randomly collected are triploid (2n=42) hybrids. Ribosomal gene mapping on chromosomes and genomic in situ hybridisation confirms the hybridity. However, the triploid hybrids are not morphologically distinct, i.e. they are not different from diploid and tetraploid birch plants that have intermediate… CONTINUE READING