Seed quality of different Sorbus L. Species introduced in Bashkir Cis-Urals

Size and weight values, duration of germination and seed germination capacity of different species of Mountain ash ( Sorbus L.) are determined under the conditions of introduction in Bashkir Cis-Urals. S. aucuparia and S. commixta from Sorbu s section are characterized by the least depth of organic dormancy, S. armeniaca and S. mougeottii from Lobatae section - by the greatest one. Cold stratification during 2.5-5.5 months is necessary for seed germination. Seed germination capacity of introduced Mountain ash species is characterized by not high values that may be connected with the specific of yield formation in the year of seed collection.