Effect of hormone and its concentrations on root formation:
The effect of basal medium in combination of 2 hormones (NAA and BAP) was studied. As shown in Table 2. The highest root length were observed in 1 mg/l NAA with 0.25 mg/l BAP (4.167 ± 0.15 cm) in the other hand, the lowest root length and the lowest rooting percentage (73 %) is related 1 mg/ l BAP (1.297 ± 0.03 cm), growth rate was shown better in all treatment containing NAA supplied in combination with BAP in comparison with NAA and BAP was used individually (Table 2).These results are similar to Sajid et al (2006) that was performed on root formation in tissue culture of grape. They reported that combination of NAA with BAP were more effective for root induction (11). Increasing concentration of NAA from 0.5 to 1 mg/l, increase root length. The addition of NAA up 2 mg/L to the medium leads to the decrease in root length.