The effect of weather conditions on the seasonal rhythm of plant development of Amur cork tree (<i>Phellodendron amurense</i> Rupr.) in the forest-steppe of the Ob region

Background. Amur cork tree is a valuable woody plant of great economic importance. Its bark, liber, leaves, and fruits are successfully used in medicine and cosmetology. This tree is very ornamental and serves as is a good honey plant. It can be a potential source of industrial cork. Due to its properties and relative unpretentiousness, Amur cork tree may be of interest for introduction. In this regard, the aim of the research was to study the peculiarities of the influence of weather conditions on the seasonal rhythm of plant development for Amur cork tree (Phellodendron amurense Rupr.) under the conditions of the foreststeppe in the Ob region.Materials and methods. Thirty two Amur cork trees were used as the material for the study. These trees were successfully introduced in the forest-steppe of the Ob region. Phenological observations to evaluate the rhythm of seasonal growth were carried out according to the methodological recommendations of I. D. Yurkevich and coauthors. The Pearson correlation coefficient (r) was used to identify the dependence of the rhythm of seasonal growth on weather conditions.Results. The plants of Amur cork tree were found to be successfully adapted to the conditions of the arboretum of the Siberian Research Institute of Plant Production and Breeding. It was shown that in the year with the highest sum of effective temperatures (2020), the duration of interphase periods was on average 2 days shorter than in other years. At the same time, in the coldest year (2018), the plants did not have time to complete their leaf fall before the snow cover appeared. The vegetation of Amur cork tree was observed to start in mid-May. The completion of the growing season varies greatly from year to year. Conclusion. It was established that the seasonal development of Amur cork tree in the forest-steppe of the Ob region corresponded to the features specific to the development of this species within its natural range.