Micropropagation of Buxus hyrcana Pojark., an ornamental species under danger of extinction

Box tree (Buxus hyrcana Pojark.), is an ornamental tree and shrub species that has application in various industries. Growth and development of box tree is very slow, its rooting is hard and is under danger of extinction. Thus, the purpose of this research was investigation of the effect of different concentrations of BAP and IBA (0, 0.5, 1, 1.5 and 2 mg l-1 form each two) on micropropagation of box tree. The experiment was carried out as factorial based on a randomized complete block design in four replications. Results of the present research showed that the largest number of shoots (6.200/plantlet) was obtained in apical buds expalnts treated with 1 mg/L BAP along with 0.5 mg/L IBA. Apical bud explants were produced the maximum node number (4.100/plantlet) in medium containing 1 mg/L BAP and the largest number of leaf (with average of 6.566/plantlet) along with 1.5 mg/L IBA. Also, the largest number of root (6.466/plantlet) was calculated in explants treated with 1 mg/L BAP plus 1.5 mg/L IBA. Plantlets were transferred to pots containing peat and perlite with ratio of 1:1 for acclimatization. The pots were kept in a greenhouse with temperature of 24-26ºC and relative humidity of 70% and periodic irrigation. Around 90% of those were healthy. These acclimatized plantlets were similar to mother plants.