PRESERVATION OF DECORATIVE QUALITIES OF CUT ROSES (ROSA HYBRIDA)

The purpose of this work was to study the post-harvest physiology of cut roses (R. hybrida). The objects of study were the most popular varieties in floristics: Magady, Vendella, Red Naomi, First Red, Grandgala. Studies were carried out in the autumn-winter periods of 2016- 2018 on leafy flowering shoots in laboratory with natural diffused light at an air temperature of 18-20 °C. Sampling was carried out at the stages of half-release, complete dissolution, the beginning and completion of the aging of flowers. The study in the gas exchange dynamics of cut rose flower shoots using the infrared gas analyzer LI — COR 6400RX showed a decrease in the intensity of photosynthesis and maintaining a high level of transpiration intensity and stomatal conduction of the leaf with the development and aging of the flower. The high intensity of transpiration and the large leafiness of the shoot make it difficult to maintain water status, accelerate aging and the loss of the decorative qualities of the flower. Pulsating treatment with silver thiosulfate (4 mM AgNO3: 32 mM NaS2O3) was used as inhibitor of ethylene synthesis, and 1 μl L–1 1-methylcyclopropene (1- MCP) was inhibitor of ethylene sensitivity. The results of the use of the inhibitor method allow us to conclude that ethylene is involved in the regulation of only the final stages of flower aging in roses. As trigger of the aging process can be the threshold effect of one or several gradual biochemical processes associated with the mobilization of nutrients. Visible signs of aging are preceded by impaired membrane stability. The commercial drug Chrysal does not ensure the natural development of the flower, but only slightly retards wilting. The growing conditions and storage of cut roses should ensure the active functioning of the stomatal apparatus, preventing water stress in the post-harvest period. Its consequence consists not only in the loss of turgidity of the petals, but also in accelerating aging due to the accumulation of ethylene.

water stress, leaf gas exchange, vase life, index membrane stability, 1-methylcyclopropene, rose (R. hybrida), petals senescence, silver thiosulfate, stomatal closing ability, ethylene

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