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Comparative organogenesis of the species of the genus Hosta Tratt

For the first time, a comparative analysis of organogenesis in Hosta species - H. decorate, H. sieboldiana, and H. lancifolia in the forest-steppe zone of Western Siberia was performed. It was found that the intrarenal formation of generative organs in these species is laid during the growth of monocarpic shoot in May- June. Differentiation of the growth cone of the renewal shoot occurs synchronously from stages III to VIII of organogenesis for 56-91 days. In the early-flowering species H. decorate, the organ-forming process occurs 25 - 27 days faster than in the late-flowering H. lancifolia. Generative organs in the rudimentary inflorescence are formed acropetally. Stages of organogenesis from IX to XII correspond to phenophases from the beginning of flowering to fruiting. In the pre-winter period, the cone of growth of the renewal shoot in all species is at the II stage of organogenesis, with 4 to 6 leaf metamers embedded in its basal part.