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International Journal of Advanced Science and Technology Vol. 29, No. 7, (2020), pp. 1888-1899 Features Of The Reproductive Sphere Of Species Of The Genus Hosta Tratt Irina S. Kazakova1, Anna I. Repetskaya1, Irina G. Savushkina1, Natalya V. Nevkrytaya 2, Vladimir S. Pashtetsky2, Natalia A. Kashirina2 1 V.I. Vernadsky Crimean Federal University, 4 Prospekt Vernadskogo, Simferopol, Republic of Crimea, 295007, Russia 2 FSBSI “Research Institute of Agriculture of Crimea", 150 Kievskaya str., Simferopol, Republic of Crimea, 295493, Russia Abstract Hosta (plantain lily) is a widespread ornamental foliage culture, yet its systematics remains incomplete. The study of the reproductive sphere of five species of hostas (Hosta sieboldii (Paxton) Ingram, H. ventricosa Stearn, H. sieboldiana (Hooker) Engler, H. rectifolia Nakai, H. plantaginea Ascherson) when introduced in the Foothill Crimea is aimed at identifying species-specific traits and selecting promising species for breeding. Morphometric, phenological, cytological methods and electron microscopy were used. Vegetation period in the Foothill Crimea is from April to November; H. rectifolia has the longest blooming period (95 days), and H. ventricosa the shortest (13 days). Flower size in the majority of species is 5-6 cm long to 3-4 cm wide; seed length varies from 8 to 13 mm and is significantly different in all species. Potential seed productivity is 191.2-594.7 ovules per plant; real productivity is 61.3-500.5 seeds. Seed setting comprises 32.1-84.9%, laboratory germination is 14.7-77%. The size of pollen grains on the polar axis ranges from 60.0 to 113.5 μm, on the equatorial axis from 29.5 to 67.1 μm; pollen fertility is 63.6-82.0%.
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