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ŠUMARSKI LIST 9-10/2021 str. 61     <-- 61 -->        PDF

The effects of different factors on propagation by hardwood cuttings of some coniferous ornamental plants
Utjecaj različitih čimbenika na razmnožavanje zrelim reznicama nekih crnogoričnih ukrasnih biljaka
Deniz Güney, Ali Bayraktar, Fahrettin Atar, Ibrahim Turna
Chamaecyparis lawsoniana ‘Ellwoodii’, Cryptomeria japonica ‘Elegans’ and x Cupressocyparis leylandii have great importance in terms of usage areas as ornamental plant. The overcoming the problem, that may be encountered in generative propagation of these taxa, using vegetative propagation method are very important for producers dealing with park and garden works. It was investigated that the effects of different greenhouse medium, rooting medium and phytohormones on propagation by hardwood cutting of studied taxa. In this study, three greenhouse medium (Greenhouse-1, 2 and 3 medium), two rooting medium (perlite and peat) and four phytohormones (IBA 1000, IBA 5000, NAA 1000 and NAA 5000 ppm) were selected. The first root and callus formation dates, rooting percentage, callus percentage, root length and the number of roots were determined. The results showed that the highest rooting percentages for C. lawsoniana ‘Ellwoodii’ were obtained as 100% in peat rooting medium (IBA 1000 ppm) at Greenhouse-2 medium and Greenhouse-3 medium and perlite rooting medium (control) at Greenhouse-3 medium. On the other hand, the highest rooting percentages for C. japonica ‘Elegans’ were obtained as 100% in IBA 1000, IBA 5000 and NAA 1000 ppm treatments at Greenhouse-1 medium, while this value for x C. leylandii occurred in NAA 5000 ppm treatment (73.33%) at Greenhouse-2 medium, in perlite rooting medium for both. The conditions required for the best rooting in cutting propagation vary according to the species studied, and generally, auxin applications, rooting medium temperature 5 °C higher than air temperature and use of perlite rooting medium can be recommended.
Key words: Cutting propagation, greenhouse medium, rooting medium, auxin, rooting percentage
Belonging to Cupressaceae family, Port-Orford cedar (Chamaecyparis lawsoniana (A. Murr.) Parl.) is famous for its great diversity of cultivars which are frequently used in parks and gardens due to the high ornamental qualities (Dirr, 1990; Mamıkoğlu, 2015). Japanese cedar or cryptomeria (Cryptomeria japonica D.Don), a coniferous evergreen indigenous to Japan and southern China, is a member of Taxodiaceae family (Maity and Moktan, 2019). The species thrives in rich, deep, acidic, moist soil but will tolerate heavy clay during dry and wet periods (Dirr, 1990). Since Japanese cedar has a lot of cultivars, it has a wide range of ornamental characteristics and usage areas (Jull et al.,1994). Leyland cypress (x Cupressocyparis leylandii Dallim. and A. B. Jackson) is an inter-generic hybrid between macrocarpa cypress (Cupressus macrocarpa Hartweg) and Nootka cypress (Chamaecyparis nootkatensis (D. Don)