Abstract
In this paper we reported the effect of different cytokinins on callus induction and adventitious shoot regeneration from leaf segments of in vitro grown Centaurea zeybekii Wagenitz seedlings. Callus was not induced when the explants were cultured on MS medium devoid of any growth regulators. Callus formation was observed in MS media containing TDZ, BA and KIN. The highest callusing response was observed in the media containing 0.005 mg/Land 0.01 mg/LTDZ (100%). In adventitious shoot induction experiments, well developed shoots were observed only MS media supplemented with KIN at the end of sixth week. The highest number of shoot per explant was obtained from the MS medium containing 1 mg/LKIN (6.2 shoots/explant). The highest average of maximum shoot length was also observed in this medium (4.17 cm). There was no difference between MS and ½ MS media in rooting but it was very low and only 15 % of total shoots could rooted in medium containing 0.5 mg/LIBA.
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