capillifolium in combination with the chloroplast haplotype of S. Some individuals possessed nuclear genomes typical for S. In this way, a pattern resembling introgression is created within a single generation. quinquefarium markers together with a chloroplast haplotype derived from S. capillifolium ISSR markers, combined with only two to five S. All hybrid genomes contained a larger proportion of S. A similarly skewed nuclear composition was found among the naturally occurring hybrid gametophytes.

Asymmetrical nuclear inheritance was found in the progeny of the hybrid sporophytes, indicating that only spores with a low level of recombination of parental genomes were viable.

We used intersimple sequence repeat (ISSR) markers and polymerase chain reaction–restriction fragment length polymorphism of the trnLUAA intron of the chloroplast genome to reveal the nuclear and chloroplast composition of mature hybrid gametophytes from natural populations and of gametophytes derived from spores of hybrid sporophytes collected in nature. Haploid hybrid gametophytes are often present at low frequencies in sympatric populations of Sphagnum capillifolium and Sphagnum quinquefarium.

Download free peat moss