The bioecological features of some species of the Cupressaceae introduced in the conditions of Tashkent City, Uzbekistan

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ELDOR E. TEMIROV
NARGIZA K. RAKHIMOVA

Abstract

Abstract. Temirov EE, Rakhimova NK. 2022. The bioecological features of some species of the Cupressaceae introduced in the conditions of Tashkent City, Uzbekistan. Biodiversitas 23: 5532-5538. For the first time, monitoring of the current state of previously introduced 19 species and 10 forms of the Cupressaceae family was carried out. Four species and five forms selected among them are distinguished by high decorativeness. The studied species and forms differ in the duration of the virginal period. Under the conditions of Uzbekistan, in forms of the genus Platycladus it lasts 4-5 years, in forms of the genus Thuja - 6-8 years, in the genera Chamaecyparis and Juniperus 6-9 years. The maximum growth and development indices under the conditions of Tashkent were observed in Platycladus orientalis f. compacta (East Asia), and the smallest ones are found in Chamaecyparis lawsoniana (North America) and Juniperus squamata (Western China). Seed germination in forms of the genus Platycladus under laboratory conditions is 56-78% (optimal temperature 20-22°C), in forms of the genus Thuja 31-46%, in Chamaecyparis lawsoniana - 21% (optimal temperature 28-29°C), the maximum rate of seed germination in the field was noted in Platycladus orientalis f. compacta (90-95%), and the minimum is Chamaecyparis lawsoniana (6-8%). For the first time, the possibility of vegetative reproduction in open ground with a rooting rate of cuttings up to 95% has been shown. Vegetative propagation gives effective results compared to a seed. For the first time in Uzbekistan, such a study was conducted on conifers, until now, no one has previously studied the biological characteristics of Conifers within the country.

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