Influence of Hormones of IAA, IBA, and NAA on Improvement of Rooting and Early Growth of Tilia rubra subsp. caucasica Form Angulata (Rupr.) V. Engler

So far there has not been any research on propagation of Tilia rubra subsp. caucasica form angulata (Rupr.) V. Engler in the world. In this research, for the first time, the rooting and early growth in cuttings of Tilia rubra subsp. caucasica form angulata (Rupr.) V. Engler was studied by applying various hormones of IAA, IBA, and NAA.
In the present study, experiments were conducted as completely randomized block design and three replications with indole-acetic acid (IAA), Indole-Butyric Acid (IBA) and naphthalene-acetic acid (NAA) with concentrations of 0 (Control), 50, 100 and 200mg/l for 115 days.
Based on the findings, compared to control, rooting percentage was enhanced about 37.5% in cuttings imbibed with 100mg/l IBA. Root number and root length respectively showed an increase of 28.6% and 22.3% in cuttings imbibed with 200mg/l IAA. The greatest root mass was perceived in IBA 200mg/l, which was about 2.5 times larger than that in control. In IBA 200mg/l, the increase in leaf mass and total plant mass was 51.4% and 36.2%, respectively. The hormone of 100 mg/l IBA performed an advancement of 37.5% in rooting, 42% in shoot length and 37.5% in seedling survival.
In total, it can be accepted that although hormones promoted rooting as well as early growth of seedling in Tilia; however, the 100mg/l IBA can be favored as a superior choice for seedling production of this species.