Pollen storage is the only way how to overcome the differences in phenology of forest trees and
geographically determined reproductive barriers between them during controlled pollination. Pollen viability
of Scots pine (Pinus sylvestris L.), mountain dwarf pine (P. mugo Turra) and their hybrid swarms was evaluated
after 3-years storage at −20°C using in vitro germination test. One population of each P. sylvestris and P. mugo
were involved into study along with three hybrid swarms. Germination potential of the stored pollen grains
was reduced significantly in comparison with freshly collected pollen. Profound decrease in germination
rate was recorded in the two hybrid swarms (4.0–4.7%), less profound in the remaining three populations
(0.6–2.4%). Pollen tube length, as the second pollen viability trait was reduced in stored pollen grains in a
larger extend ranging between 51.4% and 54.3%. The pollen grains of the species P. mugo was exception in
this respect yielding pollen grains whose growth was retarded of 21.9% only. Analysis of variance confirmed
significant differences between fresh and stored pollen grains. Statistically significant were also the differenc-
es between compared populations and between tested individuals of the respective populations.
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