EFFECT OF DIFFERENT NAA AND IBA CONCENTRATIONS ON ROOTING OF VEGETATIVE CUTTINGS OF TWO ROSE CULTIVARS PUBLISHEDElisabeta SUSAJ, L. SUSAJ, Irena KALLÇO
Rose (Rosa sp) is one of the most used ornamental plants for decoration of parks and gardens, and as cut flower, all over the world, as well in Albania. The paper presents the effect of two different concentrations of NAA and IBA on rooting of vegetative cuttings of two cut flower rose cultivars. Study was conducted during 2009 in a flower greenhouse nursery in Kamëz, Tirana. A randomized complete block design (RCBD) with three replications and five variants per replication, with 100 cuttings (pots) per variant was used. Vegetative axillary cuttings 15 cm long were dipped for 20 seconds in 500 and 1000 ppm powders of Naphthalene Acetic Acid (NAA) and Indole-3-Butyric Acid (IBA), and were planted in individual pots filled with a mixture 50/50 potting soil and perlite. Survival (rooting) percentage (%), number of roots per cuttings, root length (cm), sprout length every ten days after rooting and at the end of vegetation (cm) were recorded. The data showed that use of different rooting hormones affected the recorded characters of both cultivars, and the different hormone concentrations affected them, as well. Compared to control (untreated cuttings), use of rooting hormones provided significantly higher values of recorded characters of both cultivars, and there were shown differences between cultivars, too. Maximal survival percentage was recorded by using IBA 500 ppm for both cultivars (91% and 89%, respectively), the maximal number of roots (50 and 47 roots) and the longest roots at the end of vegetation (31 and 28 cm) were recorded by using IBA 1000 ppm, but the strongest roots and healthier seedlings were developed by using IBA 500 ppm. At the same time, the use of rooting hormones has positively affected sprout length. The longest sprouts were developed by using IBA 500 ppm (66 and 62.3 cm, respectivley). The increase of NAA and IBA concentration from 500 ppm up to 1000 ppm provided shorter shoots. Use of IBA 500 ppm seems to be the most sustainable practices in terms of seedling production and nature preservation.
IBA, NAA, Rosa sp, rooting hormones, vegetative cuttings.