Research subjects: 4 species of Magnoliaceae famili: Magnolia kobus DC., Magnolia x soulangeana Soul.-Bod., Magnolia obovata Thunb. - representativas of Magnolia L. genus, and Liriodendron tulipifera L. - a representatave of Liriodendron L. genus. Research objectives: To study bioecological characteristics of some Magnoliaceae species in conditions of the South - East of Ukraine; to analyse their resistance to extreme environmental factors and reveal critical points of the development. Methods: morphological, anatomical, ecological and physiological and others. Theoretical and practical results: The carried out investigations are of great interest for working out theoretical questions on aboreal plants introduction, botanical resource science and plant ecology. Ecobiological characteristics of M. kobus, M. x soulangeana, M. obovata and L. tulipifera were studied in conditions of the South-East of Ukraine. Phenophases, floral phenogenesis, antecology and fruiting of above-mentioned species were investi gated. Ways of M. kobus and M. x soulangeana seedage are elaborated. The resistance of falling leaves Magnoliaceae to early autumn and late spring frosts and thaws is investigated. The questions on drought and hot resistance of these plants are considered, a scale of complex assessment of given indices is offered. Critical periods in a year's cycle of the development of Magnoliaceae family are established. By modified scale of calculation of integral numerical index of introducents vital capacity prospective species are marked out for their further introduction. Novel ty of the introduced: for the first time were investigated bioecological peculiarities of falling leaves Magnoliaceae (M. kobus, M. x soulangeana, M. obovata and L. tulipifera) in conditions of the South-East of Ukraine. Phenophases, floral morphogenesis in the steppe introductive region were studied. Original ones are antecological investigations, study of extreme ecological factors influence (low temperatures, fluctuations of the temperature, humidity) on the development of male gametophyte in field and model experiments. The processes of fruitage are analysed. The ecological and physiological indices of frost, - winter, -hot and drought resistance of Magnoliaceae are investigated. For the first time responses of Magnoliaceae to late spring, early autumn frosts and thaws were studied in field and model experiments. The critical periods in a year's cycle of introduced species were established. Implementation degree: the results were implemented in SKRAU "Greenconstruction", ZSAU "Zaporozhzelenkhoz" forplanting of greenery on the territory of the town, and also for planting trees and shreebs on the territory of the State Regional school psychiatric and neurologic sanatorium and children's hospital number 1; in the lecture and practical courses "Botany", "Plant physiology", "Industrial botany", "Ecophysiological basis of plants resistance". Effectiveness: will promote optimization of improvement of ecological conditions of industrial territories, co ntaminated by chromium, improvement of ornamental flower plants conditions, enlargement of assortment for industrial zones planting; increase of students training level. Sphere, sector of implementation: botany, ecology, nature protection, green construction.
