In order to easily identify the origin of calli in this phase of the experiment, only calli produced in induction medium supplemented with 0.5 mg/l 2,4-D and 1.0 mg/l BAP (I1) were used for differentiation. Calli were subcultured 2–3 times for one month each round on the same medium used for callus multiplication, until calli numbers were sufficient for the regeneration experiment. The calli were divided into small pieces (2 cm × 2 cm), then one piece was transferred to each flask of differentiation media mentioned. Flasks were incubated under a 12 h photoperiod at 30–40 μmol/m2/s provided by fluorescent 20 W daylight lamps at 25 ± 1 °C for 30 d. A completely randomized design was used, with ten total replicates, each of six flasks, for each type of differentiation medium.
2.5. Plantlet rooting and transplanting
Healthy shoots differentiated from green calli with 3–4 true leaves were excised from the culture and transferred to one of four types of rooting media. All rooting media consisted of MS salts, 30 g/l sucrose, 6.5 g/l agar, and pH adjusted to 5.9–6.0. Each type (labeled as R1–R4 in Table 3) was supplemented with four levels of IBA (0, 0.05, 0.1, 0.2 mg/l) and subjected to autoclaving as previously described. The rooting experiment was again devised as complete randomized design, with 50 replicates of one regenerated plantlet per replicate at each level of IBA.
In order to easily identify the origin of calli in this phase of the experiment, only calli produced in induction medium supplemented with 0.5 mg/l 2,4-D and 1.0 mg/l BAP (I1) were used for differentiation. Calli were subcultured 2–3 times for one month each round on the same medium used for callus multiplication, until calli numbers were sufficient for the regeneration experiment. The calli were divided into small pieces (2 cm × 2 cm), then one piece was transferred to each flask of differentiation media mentioned. Flasks were incubated under a 12 h photoperiod at 30–40 μmol/m2/s provided by fluorescent 20 W daylight lamps at 25 ± 1 °C for 30 d. A completely randomized design was used, with ten total replicates, each of six flasks, for each type of differentiation medium.2.5. Plantlet rooting and transplantingHealthy shoots differentiated from green calli with 3–4 true leaves were excised from the culture and transferred to one of four types of rooting media. All rooting media consisted of MS salts, 30 g/l sucrose, 6.5 g/l agar, and pH adjusted to 5.9–6.0. Each type (labeled as R1–R4 in Table 3) was supplemented with four levels of IBA (0, 0.05, 0.1, 0.2 mg/l) and subjected to autoclaving as previously described. The rooting experiment was again devised as complete randomized design, with 50 replicates of one regenerated plantlet per replicate at each level of IBA.
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