Propagation of Ornamental Plants
19(2): 48-51, 2019
FLUORINE CONTAINING TOPOLIN CYTOKININS FOR PHALAENOPSIS AMABILIS (L.) BLUME MICROPROPAGATION
Nino Murvanidze1*, Karel Doležal2, and Stefaan P. O. Werbrouck1
1 Laboratory for Applied In Vitro Plant Biotechnology, Faculty of Bioscience Engineering, Ghent University, 1 Valentin Vaerwyckweg str., 9000 Ghent, Belgium,
2 Department of Chemical Biology and Genetics and Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science of Palacký University and Institute of Experimental Botany of the Czech Academy of Sciences, 27 Šlechtitelů str., CZ-78371 Olomouc, Czech
In vitro cloning of Phalaenopsis hybrids is generally characterized by slow growth and low multiplication rates. Therefore, the impact of 6-(3-fluorobenzylamino)purine (FmT) and its 9-β-D-riboside (FmTR) was evaluated. These halogenated compounds have been selected based on their very high cytokinin activity in previous bioassays. The Phalaenopsis plantlets formed significantly more, but smaller new shoots when treated with FmTR (25.3) compared to FmT (14.6) and BA (7.0). Furthermore, FmTR treatment completely abolished rooting during the micropropagation phase. Additionally, an interaction between cytokinin type and headspace aeration was noticed. For all treatments, the number of shoots increased significantly when grown in tightly closed containers. The use of fluorinated topolins might present a breakthrough in the in vitro micropropagation of Phalaenopsis.
Key words: cytokinin, filter recipient, N6-Benzyladenine, shoot multiplication