Abstract:
To study the method and optimum concentration in micropropagation on Anubias congensis using by thidiazuron (TDZ) and indole-3-acetic acid (IAA) consisting of three experiments were conducts to find out. The first experiment examined to evaluate the different
concentrations of TDZ in MS semi-solid medium (Murashige and Skoog, 1962) on the growth and morphology of A. congensis explants. The treatment media contained TDZ at the concentrations of 0, 2, 4, 6 and 8 mg/L for 6 weeks. MS Medium supplemented with 2 mg/L TDZ induced the highest number of shoots and leaves (P<0.05). Adding a large amount of TDZ tended to decrease the number of roots in A. congensis in vitro culture. The TDZ treatments produced 100 % of multiple shoots (P<0.05). In the second experiment, the effect of TDZ and IAA on shoots and roots induction of A. congensis was examined. The combination of TDZ at 0, 0.01, 0.02, 0.03 and
0.04 mg/L and IAA 0.00, 0.10 and 0.20 mg/L were supplemented MS medium. After 8 weeks, it was found that the explants cultured by the addition of TDZ 0.04 mg/L and IAA 0.20 mg/L in MS medium induced 6.7 shoots/explants and 0.9 roots/explants (P<0.05). The combination of TDZ and IAA treatments produced 100 % of multiple shoots while the control did not generate multiple shoots at all. The addition of TDZ 0.01 and IAA 0.20 mg/L was increased the number of roots 4.6 roots/explants and 4.83 shoots/explants were obtained. The third experiment was studied of optimum duration on A. congensis micropropagation. The explants were cultured in liquid MS medium containing TDZ 0.01 mg / L at the duration of 1, 3 and 5 days and liquid MS medium noncontaining TDZ as control. After that, all treatments transferred to semi-solid MS medium with IAA 0.20 mg/L for 6 weeks. It was found that the explants were cultured for 5 days had the highest number of shoots (5.0 shoots/explant) and roots (3.9 roots/explant) (P <0.05). Therefore, the
method of micropropagation in A. congensis using TDZ and IAA consists of TDZ 2 mg/L were supplemented MS medium for enhancing shoots. Plantlet productions have used a combination of TDZ 0.1 mg/L and IAA 0.2 mg / L for 8 weeks or culturing for 5 days in liquid MS adding TDZ 0.1 mg /L and transferred onto MS medium supplemented with IAA 0.2 mg/L for 8 weeks.