Abstract
Factors affecting micropropagation efficiency of 32 selections of Rubus, including the pre-treatment and initiation culture stages, were investigated. Chilling at 4°C for 6 weeks as a pre-treatment significantly promoted in vitro initiation culture; up to 65% of initiation cultures post chilling were successful. The cytokinin 6-benzyladenine (BA) was the most effective of the three tested for promotion of multiple shoot development in culture, with an average of three to seven shoots or plantlets developed from each single node. Alternating the concentration of BA between 4.44 and 13.31 μM from sub-culture to sub-culture improved recalcitrant Rubus micropropagation, and reduced the problems associated with long-term culture in the presence of high concentrations of BA. Reduction of the strength of macro- and micro-elements in the basal medium from half to one-third, with addition of 0.49 μM indole-3-butyric acid and 0.05% activated charcoal, and placing the cultures under reduced light intensity (17 μmol m−2 s−1), was found to alleviate chlorosis and improve micropropagation with high quality Rubus plantlets. Response to in vitro culture differed greatly and consequently different methods of micropropagation were required by different genotypes. From these selections, three types of micropropagation including micro-cutting, micro-shoots and multi-shoots were observed, and their efficiency was characterized.
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Abbreviations
- BA:
-
6-Benzyladenine
- IBA:
-
Indole-3-butyric acid
- AC:
-
Activated charcoal
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Acknowledgments
We thank M. Astill for providing light intensity data; R. Edwards, T. Machin, T. Dawson, M. J. Stephens and P. Sutton for technical support; M. Heffer, T. Holmes, and M. Pesonen for some of the photography; and R. A. Beatson, P. M. Datson, A. R. Ferguson, L. Gea, A. R. Granger, F. A. Gunson, A. G. Seal (Plant & Food Research, New Zealand), G. J. de Klerk (Wageningen University, The Netherlands), and the editor and three anonymous reviewers from the journal, for their valuable comments on the manuscript. This work was supported by a 2000/2002 NSOF project.
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Wu, JH., Miller, S.A., Hall, H.K. et al. Factors affecting the efficiency of micropropagation from lateral buds and shoot tips of Rubus . Plant Cell Tiss Organ Cult 99, 17–25 (2009). https://doi.org/10.1007/s11240-009-9571-5
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DOI: https://doi.org/10.1007/s11240-009-9571-5