3.6. Rooting of elongated shoots and RAPD analysis of regenerated plants
When the elongated shoots reached 2–3 cm in height they were transferred to root-inducing medium. Roots were observed as early as 3 weeks after the transfer,while most of the shoots developed roots within 7 weeks. Shoots of BTC had a better rooting response(67.62%) compared with those of Val(61.65%).Finally,rooted plantlets (Fig.1F) were successfully recovered from both BTC and Val,despite as lightly different rooting response between the two cultivars. In vitro plantlets grew actively during the acclimatization process and viable plants in pots were ultimately established in greenhouse (Fig. 2), which were morphologically similar to the mother plant.
In order to confirm whether somaclonal variation was detectable in the regenerated plants RAPD was employed to analyze the genetic fidelity of four plants randomly selected from the regenerated population of both cultivars. Four polymorphic primers (A5, A11, A13 and AA18) that have been screened earlier were used for this purpose. As can be seen in Fig. 3, the regenerated plants shared the same banding patterns as those of the donor plants providing leaf explants, implying that they were possibly genetically identical to each other.
3.6. Rooting of elongated shoots and RAPD analysis of regenerated plantsWhen the elongated shoots reached 2–3 cm in height they were transferred to root-inducing medium. Roots were observed as early as 3 weeks after the transfer,while most of the shoots developed roots within 7 weeks. Shoots of BTC had a better rooting response(67.62%) compared with those of Val(61.65%).Finally,rooted plantlets (Fig.1F) were successfully recovered from both BTC and Val,despite as lightly different rooting response between the two cultivars. In vitro plantlets grew actively during the acclimatization process and viable plants in pots were ultimately established in greenhouse (Fig. 2), which were morphologically similar to the mother plant.In order to confirm whether somaclonal variation was detectable in the regenerated plants RAPD was employed to analyze the genetic fidelity of four plants randomly selected from the regenerated population of both cultivars. Four polymorphic primers (A5, A11, A13 and AA18) that have been screened earlier were used for this purpose. As can be seen in Fig. 3, the regenerated plants shared the same banding patterns as those of the donor plants providing leaf explants, implying that they were possibly genetically identical to each other.
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