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Paulownia is an important energy and decorative wood crop, which is still new and uncommon in Ukraine. Microclonal propagation of Paulownia elongata × P. fortune at late cycles of aseptic cutting in vitro is accompanied by a decrease in axillary buds activity as well as slow growth and development of cuttings on medium MS with 30 g / l sucrose, 2.5 g / l lysine, 7 g / l agar, and 2.0 mg / l 6-benzylaminopurine. Optimization of the phytohormonal composition of the given medium by adding 1.5 mg / l 6-benzylaminopurine, 1.0 mg / l of gibberellic acid GA3, 0.5 mg / g adenine and 0.1 mg / l 3-indolylacetic acid allowed to increase the efficiency of in vitro micropropagation of paulownia in late cycles (from the sixth to the tenth) up to the level of early cycles of aseptic cutting. [ABSTRACT FROM AUTHOR]

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Copyright of Plant & Soil Science is the property of National University of Life & Environmental Sciences of Ukraine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Generalization and analysis of experimental data concerning peculiarities of passing and duration of various phenological phases of Th. plicata, their consistency with the sums of effective temperatures is provided in the article. Conducted researches based on observations and mathematical processing allowed to reveal the regularity of passing of all vegetative and generative phases in the area of introduction and to reveal the dependence of these processes on ecological factors. It was found that the vegetation period of this species is 151 ± 3 days. Influence of nature and degree of temperature, air humidity and rainfall on the growth of shoots were also determined. It turned out that air temperature has the greatest influence on the growth peculiarities of one-year shoots. Growth of shoots begins after changing of the average daily temperature above +9°C. Culmination of increments is observed in May, when the temperature is 13-18°?. Then, increments are fading with the increase in temperature and decrease in humidity and the second wave of growth occurs in August. Shoots completely finish their growth in September. Precipitation and humidity do not have a significant effect on the growth of shoots. [ABSTRACT FROM AUTHOR]