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2013 | 35 | 08 |
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In vitro propagation and assessment of genetic stability of micropropagated Samanea saman (rain tree) using microsatellite markers

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An efficient in vitro propagation of Samanea saman (rain tree) protocol has been successfully developed using nodal explants from a 20-year-old tree. Higher percentage (76 %) of explants produced up to five shoots per explant on Murashige and Skoog (MS) medium supplemented with 2 mg L-1 6-benzyladenine (BA), 0.1 mg L-1 gibberellic acid (GA3) and 100 mg L-1 casein hydrolysate after 3 weeks of culture. When explants were subcultured to fresh medium after harvesting first batch of shoots, more shoots could be generated (another eight shoots per explant). Shoot elongation was achieved (3 cm) when shoots were cultured on MS medium supplemented with 0.25 mg L-1 BA and 0.75 mg L-1 GA3. In vitro generated shoots rooted on MS medium fortified with 0.75 mg L-1 indole-3-butyric acid plus 0.1 % of activated charcoal. A higher percentage of explant response and shoots per explant were obtained on MS medium with BA and GA3. Each responsive nodal explant yields an average of 15 rooted plants within a period of 10 weeks. Rooted plantlets were successfully acclimatized in green house with a survival rate of 90 %. Micropropagated plants were tested for genetic stability using simple sequence repeats (SSR) markers. Use of the 12 high-resolution SSR markers revealed the exact same genetic profile between the mother tree (donor) and micropropagated plants, suggesting the genetic fidelity of our micropropagation protocol. The same protocol was also used successfully in propagating a ‘‘Golden Rain Tree’’ although response of explant and efficiency of propagation was much lower. This protocol will be useful for germplasm preservation/large scale production of true-to-type clones of desirable genotypes.
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  • Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604, Singapore
  • Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604, Singapore
  • Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604, Singapore
  • Centre for Urban Greenery and Ecology, National Parks Board, Singapore Botanic Gardens, Singapore 259569, Singapore
  • Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604, Singapore
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