قلمه ساقه

One of the most important species of roses is the Damask rose, some of whose cultivars are important for the production of essential oil and others are cultivated as garden roses. In order to investigate effect of indole buteric acid (IBA), growing media and cuttings diameter on the quality of rooting, an experiment was designed a factorial based on randomized complete design with 30 treatments and 3 replications. Treatment contained growing media at 3 levels (cocopeat 30%+perlite 70%, cocopeat 50%+perlite 50% and sand 50%+perlite 50%), IBA concentration at 5 levels (0, 1000, 2000, 3000, 4000 mg L-1) and stem diameter at 2 levels (5-13 and 13-20 mm). Results showed that the survival rate of Damask rose was significantly increased by increasing the concentration of IBA up to 3,000 mg.L-1. The highest number of leaves was observed in 2000 and 3000 mg.L-1 of IBA and more thick cuttings. Interaction between IBA concentration and cuttings diameter in most traits was significant, except for root number. The highest root length, root number, leaf number, viability, and longest root length were observed in culture media 30:70 cocopeat and perlite. According to results, 2000 mg L-1 IBA, thicker cuttings and cocopeat 30%+perlite 70% growing media could be suggested for maximum survival percentage and root density.

In order to investigate the morphological reactions of Thymus kotschyanus Boiss. cutting to auxins (IAA and IBA) in different concentrations, an experiment was conducted in 2009 at the greenhouse conditions of Semnan Agriculture and Natural Resources Research Station. This research was conducted as a factorial experiment in a randomized complete block design with 3 replications and 20 observations per replication. The treatments included A: two types of auxin (Indole-acetic acid (IAA) and Indole-3-butyric acid (IBA)) and B: concentrations of auxin, (0, 100, 200, 300, 1000, 2000 and 3000 ppm). The traits studied were the root length and number, the percentage of rooting and dry root weight and new buds in plants. Results showed that the highest root dry weight and the root length were observed in the cuttings treated with 100 and 300 ppm of auxins. These concentrations (100 and 300 ppm) of auxins respectively stimulated root dry weight by about 3.6 and 3.25 times higher than control plants and increased the root length by about 150 and 90 percent more than control cuttings. The highest root length, root number, and number of new buds in the cuttings of Thymus kotschyanus were obtained due to the application of IAA as compared with IBA. Our findings confirm that the cuttings treated with 100 ppm of IAA can produce the highest quality transplants at commercial scale.