EVALUATION OF THE RESISTANCE OF FLORIBUNDA ROSE VARIETIES TO THE INFLUENCE OF ENVIRONMENTAL FACTORS IN THE CONDITIONS OF THE RIGHT BANK FOREST STEPPE OF UKRAINE
Authors: Brovdi А. А. , Polishchuk V. V. 
Published: May 2023

The introduction of plants is an important element of the improvement of cultural phytocenoses, which include garden and park plantations and elements of greening of populated areas. Its success depends on the degree of adaptation of plants to new conditions and allows predicting their further implementation with a high degree of probability. The success of plant adaptation to new growth conditions mainly depends on their response to the influence of limiting environmental factors, therefore, evaluating their impact on plant growth and development is of practical importance. Investigating the resistance of ornamental plants to influencing factors in the conditions of local growth, it is possible to select the most resistant genotypes, which will allow obtaining highly decorative plantings throughout the growing season.

The success of adaptation of the floribunda rose varieties in the conditions of research was determined by calculating the acclimatization number, where the highest indicator is 100, which corresponds to full acclimatization. The results of the assessment of plant adaptation indicate a high degree of success in the acclimatization of all roses of the floribunda group. The value of the acclimatization number was within 61-95 points, which corresponds to full and good adaptation and confirms their high prospects for decorative gardening in the conditions of conducting research.

The results of the evaluation showed high winter hardiness of the genotypes in the conditions of the research. Результати проведеної оцінки показали високу зимостійкість генотипів в умовах проведення досліджень. In particular, the varieties Pomponella, Lovely Green, Westpoint, Minerva, Novalis, Goldelse, Rotkappchen, Bella Rosa and Let's Celebrate, whose degree of damage by low temperatures did not lead to deterioration of their decorativeness, are recognized as highly winter-hardy.

The results of the visual evaluation of floribunda rose varieties in the driest growing season established a high level of drought resistance of the majority of studied varieties. Drought did not cause obvious damage to plants of most varieties. At the maximum daytime temperatures, the varieties Lovely Green, Arthur Bell, Lilli Marleen, Minerva, Novalis, Goldelse, Lavaglut, Iceberg and Henri Matisse showed only a temporary loss of turgor, leading to wilting of the leaves, however, under favorable conditions, he quickly recovered.

The general drought resistance of plants was determined taking into account the actual state of plants under the direct action of limiting factors and their influence on the further development of plants. It was determined that the most of floribunda rose varieties tolerate temporary precipitation deficits well, the negative manifestation of which was, for the most part, manifested in changes in plant growth rhythms, in particular, an increase in flowering breaks, however, flowering productivity recovered in subsequent years.

In general, the results of the assessment indicate the high resistance of floribunda rose varieties to lack of moisture and rainfall, which makes them a valuable material for decorative gardening.

Taking into account the indicators of resistance of floribunda rose varieties to the negative impact of environmental factors, it is possible to draw conclusions about their value and prospects for use in decorative gardening and landscaping.