Abstract
Artificial hybridization experiment with the Pinus sylvestris and Pinus mugo putative hybrid individuals and their parents revealed a selective nature of their crossability conditioned by the identical chloroplast DNA (cpDNA) haplotypes of the crossed individuals. Efficiency of hybridization between hybrid individual H1 of P. sylvestris haplotype and P. sylvestris paternal tree was relatively high, as evidenced by 78.03% of filled seeds. On the contrary, the crossing of H1 individual with P. mugo was unsuccessful. Likewise, the crossability of the H2 individual of P. mugo haplotype with the paternal tree P. mugo resulted in 31.15% of filled seeds. A relatively high crossability was characteristic also for the H1 and H2 hybrid trees of different cpDNA haplotypes. A conclusion has been drawn postulating weakened reproduction barrier between hybrid swarm individuals and the paternal species P. sylvestris and P. mugo. Differentiation of the putatively hybrid individuals from the parental species is accompanied by the variation in cpDNA inheritance.
Highlights
The role of spontaneous hybridization between different species of plants during the evolution is widely discussed issue of the evolutionary biology [1] [2] [3]
Artificial hybridization experiment with the Pinus sylvestris and Pinus mugo putative hybrid individuals and their parents revealed a selective nature of their crossability conditioned by the identical chloroplast DNA haplotypes of the crossed individuals
It is obvious that genetic differentiation between the putative hybrids and the parental species P. sylvestris and P. mugo is conspicuously lowered in comparison with the differentiation between the pure species P. sylvestris and P. mugo
Summary
The role of spontaneous hybridization between different species of plants during the evolution is widely discussed issue of the evolutionary biology [1] [2] [3]. Introgressive hybridization is in this context of special interest It occurs between systematically related species of plants whose areas of natural distribution overlap to a lesser or larger extent offering the possibility for mutual hybridization in a contact zone. The authors revealed 1% - 2% of hybrid individuals in the sympatric population of the species at the Węgliniec reserve in Poland, shedding some light on the interaction between hybridizing taxa. We have been subjected to analyze the hybrid swarm population of P. mugo and P. sylvestris in north Slovakia aiming to the description of the complicated hybridological relationships between hybrid individuals of the swarm and their putative parental species P. sylvestris and P. mugo
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