Pirko I. Morphobiologic potential of parviflorous cultivars of genus the Dendranthema (DC.) Des Moul. introduced into Donetsk Botanical Garden

Dissertation for Candidate Degree in Biology, speciality 03.00.05 – Botany. – N.N.Hryshko National Botanical Garden, National Academy of Sciences of Ukraine. – Kyiv, 2011. The dissertation is an outcome of an integrated study of the potential of morphologic and biologic features of the introduced plants. Characteristics of 73 cultivars Dendranthema Ч hortorum Bailey and the sample of D. zawadskii (Herbich) Tzvelev in the conditions of the introduction point have been presented. The spectrum and amplitude of variability of basic decorative, economic and biologic features, i.e. the height and habitus of the plants, the diameter, structure and colouring of inflorescences, the blossom-time and fruiting ability have been studied. Modification changes of the features under consideration in arid conditions of the steppe zone have been revealed. A potential of combining variability for D. Ч hortorum realized in 3 generations of polycross progeny and dynamics of D. Ч hortorum phenofund in the process of morphogenesis have been shown. The amplitude of modification variability of the D. zawadskii sample in the conditions of the introduction point and the potential of its combining variability realized in the seed progeny of the first reproduction and mutation variability realized in 4 generations using multi-stage treatment with chemical mutagens have been discussed. As a result of realization of the morphobiologic potential, 357 potentially productive hybrid forms of D. Ч hortorum have been obtained, with 14 of them patented and registered in the State Record of Plants Varieties of Ukraine, 2 being under state variety testing, and 94 potentially productive mutant forms of D. zawadskii with 12 of the latter recommended for direct introduction into decorative gardening.