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The crossability relationship between Scots pine ( Pinus sylvestris  L.) and mountain dwarf pine ( Pinus mugo  Turra) was tested under field conditions using an artificial pollination approach. There was partial compatibility between the parental species, as evidenced by the amount of filled seeds in their reciprocal crossings and in control variants from self-pollination, controlled intraspecific outcrossing and open pollination of mother trees. The crossability degree in  P. sylvestris  ×  P. mugo  was characterised by the index 0.15, and the reciprocal crossing by the index 0.18. Crossability of  P. sylvestris  and  P. mugo  with their putative hybrid individuals was much higher; the number of filled seeds was comparable with that of the control variants. The reciprocal crossings of  P. sylvestris  and  P. mugo  species were highlighted by the opposite inheritance of their chloroplast DNA (cpDNA). The paternal cpDNA inheritance in  P. sylvestris  ×  P. mugo  and maternal cpDNA inheritance in  P. mugo  ×  P. sylvestris  was repeatedly confirmed using the cpDNA  trn V- trn H/ Hinf I marker as well as the newly developed partial cpDNA  trn V- trn H/ Ase I marker. The nature of the latter is described in terms of the nucleotide sequence.

silvae genetica/silvae genetica

Reinforced evidence on partial compatibility between Pinus sylvestris and Pinus mugo and on maternal inheritance of chloroplast DNA in the Pinus mugo × Pinus sylvestris cross