Features of seed germination in different ecological groups of the species of the section Violidum, subgenus Nomimium, genus Viola L. (Violaceae)

This article presents the results of seed germination in different ecological groups in the species (22 populations) of the section Violidum, subgenus Nomimium, genus Viola. Conditions for seed germination, as well as germinating ability, germination energy, intensity of germination energy, longevity of seeds and profitability of their ability, and the period when the seed germinating ability decreases by 50% (P-50) have been determined. The seeds of most species of xeromesophytes and mesophytes massively germinate at +23aEuro broken vertical bar+25A degrees C within a period of 10 days. For other species of these ecological groups, cold stratification is favorable. The hygromesophytes are characterized by prolonged seed germination (up to 2 months). The petrophyte seeds have shallow physiological dormancy (B1). The seeds of other species are, as a rule, nondormant.