???????????????? ????????????????????????? ?????????? THUJA OCCIDENTALIS L. ???????????? ???????????? ????????????????????? ????????????????????????

Анотація

DETECTION OF FROST RESISTANCE OF THUJA OCCIDENTALIS L. BY METHOD OF DIRECT LABORATORY FREEZING

H. Kryvokhatko

Abstract. Results of the research on detection of frost resistance level for sprouts of plants of cultivar of Thuja occidentalis L. in the conditions of Kyiv are provided. Potential frost resistance was detected by method of direct laboratory freezing of one-year sprouts with subsequent analysis of rate of tissue damage with use of anatomico-microscopic estimation in laboratory of plants physiology of the Institute of Horticulture of the NAAS of Ukraine. Plants of Th. occidentalis and its cultivars were the objects of the research, as follows: Th. oc. ???Wagneriana??, Th. oc. ???Wareana Lutescens??, Th. oc. ???Ericoides??, Th. oc. ???Ellwangeriana??, Th. oc. ???Lutescens??, Th. oc. ???Columna??, Th.oc. ???Globosa??, Th. oc. ???Spiralis??, Th. oc. ???Smaragd??. In the analysis the system of coefficients with improved estimation of a tissue?damage rate of bark (floema), cambium, wood, kernel was used, which considers their physiological non-equivalence in activity and regeneration ability of plants.

Keywords: Thuja occidentalis L., cultivars, frost resistance, damages.