Influence of Auxins and different growths media strength on rooting of Petunia hybrida L. In vitro Propagation

This experiment was carried out in the Plant Cells and Tissue Culture Laboratory of Horticulture and Landscaping Design Department / College of Agriculture / University of Kirkuk - IRAQ, to study the effect of auxin’s in different concentrations and MS media (full and ½) salt strength on rooting response of Petunia hybrida. The regenerated shoots explants from the multiplication stage were transferred to the rooting stage cultured on MS media ( full and ½ ) salts strength supplemented with different concentrations of IBA at ( 0.0, 0.25, 0.50, 0.75, and 1.0 ) mg.L-1, and NAA at ( 0.0, 0.25, 0.50, 0.75, and 1.0 ) mg.L-1. After 6 weeks of transforming, data showed that, the response percentage was ( 100% ) for MS media ( full and ½ ) salt strength supplemented with different concentrations of IBA and NAA beside control treatment. The best number of roots ( 29.70 root.part-1 ) and the length of the longest root ( 7.44 cm ) were recorded by MS ½ strength supplemented with IBA (1.0 mg.L-1) compared with other concentrations, and it was the highest results compared with MS full strength supplemented with different concentration of IBA. Moreover, results obtained that MS ½ strength supplemented with NAA ( 1.0 mg.L-1 ) recorded the best number of roots ( 18.70 root.part-1 ) and the length of the longest root ( 2.97 cm ) compared with the other concentrations, while it was the best result compared with MS full strength supplemented with different concentrations of NAA.