Biological features of Gladiolus tenuis Bieb. triploid and tetraploid forms at introduction in Perm krai

This article describes the biological features of Gladiolus tenuis Bieb. triploid and tetraploid forms. Both forms of G. tenuis bloom annually in the Botanical Garden of PSU. But all stages of seasonal development in the triploid form occur 7-10 days earlier than in tetraploid. The morphologically triploid and tetraploid forms differ insignificantly. The triploid G. tenuis does not form fruits and seeds, it propagates only vegetatively. The tetraploid form of G. tenuis is capable of multiplying both by seeds and vegeta-tively in Perm Krai. In this case, free pollination is more effective than self-pollination. The authors rate the introduction of the studied G. tenuis forms as highly successful in Perm Krai. The studied forms of G. tenuis can be used in gardening, tetraploid form can be included in breeding programs as a source of decorative and adaptive features.