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International Symposium
on Production and Establishment of Micropropagated Plants
April 19-24, 2015,
Sanremo, Italy


Propagation of Ornamental Plants
11(4): 177-183, 2011

THE EFFECT OF GROWTH REGULATORS AND SUCROSE CONCENTRATION
ON IN VITRO PROPAGATION OF CAMELLIA JAPONICA L.

Agnieszka Wojtania*, Eleonora Gabryszewska, and Małgorzata Podwyszyńska

Research Institute of Horticulture, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland,
*Fax: + 46 8332088, *E-mail: agnieszka.wojtania@insad.pl


Abstract
The effect of cytokinins (BAP, MemT, TDZ) and GA3 as well as different sucrose concentrations (5, 10, 20, and 30 g l-1) on the axillary shoot multiplication of Camellia japonica L. was investigated. The highest multiplication rate (3.4 shoots/basal explants and 2.4 shoots/apical explants) and high shoot quality were obtained on the WPM medium supplemented with adenine cytokinin (MemT or BAP) combined with TDZ and GA3. Thidiazuron, added to adenine-type cytokinin medium at a concentration of 0.1-0.05 mg l-1 significantly enhanced the shoot branching. GA3 stimulated the growth of axillary buds induced by TDZ and improved shoot quality. It was also found that optimal sucrose level during multiplication of C. japonica shoots was 10-20 g l-1. In the presence of low sucrose (5 g l-1) the induction of hyperhydricity was observed, while sucrose added at 30 g l-1 inhibited shoot formation. GA3 (1.0 mg l-1) added to the medium containing cytokinins (BAP + TDZ or MemT + TDZ) and high sucrose concentration counteracted the sugar-mediated inhibition of shoot formation. The best rooting response was obtained with a 20-min pulse treatment with IBA (1 g l-1) and culturing the shoots on auxin-free half strength WPM medium containing activated charcoal.

Key words: Camellia, GA3, MemT, micropropagation, sucrose concentration



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