This study was carried out to determine the root development of black mulberry hardwood cuttings kept in light and dark conditions. The experiment was carried out in the polyethylene greenhouse of Tokat Gaziosmanpaşa University Research and Application Center, in 2021. As material, hardwood cuttings prepared from one-year-old branches of black mulberry trees were used. The cuttings were divided into 3 different groups and planted in rooting beds containing perlite with bottom heating (22±2 °C). First group of cuttings were planted into beds as soon as taken from tree (control), the second group of cuttings were plantend after the cuttings were kept under daylight conditions for 5 days (in the open) and third group cuttings were planted after the cuttings were kept in the dark conditions (in the dark) for 5 days in both conditions soaked in water. All cuttings were dipped in 6000 ppm IBA (indole-3-butyric acid) hormone for 5 seconds just before planting. The experiment is with 3 replications and there are 15 cuttings in each replication. After keeping 90 days in the rooting environment, the cuttings were removed; root number (root/stem), root length (cm), root diameter (mm), decay rate (%), rooting rate (%) and callus formation rate (%) parameters were investigated. As a result of the study, there was no statistical difference between the different conditions in the investigated parameters. The data obtained varied between the following values; rooting rate between 68.89% - 93.33%, decay rate between 24.4% - 55.5%, callus formation rate between 68.8% - 88.8%, number of roots 8.8 - 13.5 root/stem, root length 6.5 - 7.4 cm and root diameter between 1.02 - 1.16 mm.

Cutting reproduction is the cheapest and most practical method for plants capable of clonal regeneration. However, the difficulties in adventitious root formation in black mulberry cuttings create a disadvantage for mulberry growers. This study aimed to investigate the effect of IBA and Paclobutrazol applications on the rooting ability of black mulberry hardwood cuttings. The experiment was carried out in the polyethylene greenhouse of Tokat Gaziosmanpaşa University Agricultural Research and Application Center in February 2022. As a material, hardwood cuttings prepared from one-year-old branches of breeding black mulberry trees within the body of the directorate were used. The study was set up in a randomized plot design with 3 replications and 15 cuttings in each replication. In the study, pure water as a control group, 6000 ppm IBA and doses of 1000 ppm, 2000 ppm and 3000 ppm Paclobutrazol respectively were applied to black mulberry wood cuttings separately and together. After the application, the cuttings were planted in perlite medium. The cuttings were kept in the rooting medium for 90 days and then removed; rooting rate, root number, root length and root diameter values were recorded. As a result of the study, the effect of the applications on the root number of the cuttings was not observed while the rooting rate, root length and root diameter parameters were observed. In terms of rooting rate, the best result was obtained from IBA+PBZ 1000 application (40.00%) compared to the control group (0.0%). The highest root length was determined in IBA 6000 application, and the thickest root diameter values were determined in PBZ 1000 application.