Physiological features of winter resistance formation in leaf succulents
The results of thaws and extreme moister on winter resistance of the stem (species from genus and leaf succulents (species from genus Sedum) have been presented. It is determined that such phenomena as provocative thaws and moister abundance in the winter period have negative influence on winter resistance of succulents. Favourable environmental conditions for the first and second stages of winter preacclimatization increase the low temperature resistance greater in leaf succulents than in stem ones. High sensibility to the provocative thaws was demonstrated with such species of stem succulents as O. leucotricha and O. microdasis. Under the modeling of different temperature regimes it has been found out that high degree of winter resistance is typical for O. engelmannii. O. lindhimtrii, C. leptocaulis, C. tunicata, S. reflexum, S. album, S. acre. These species are perspective for ornamental gardening.