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Bulk alginate encapsulation of Hibiscus moscheutos nodal segments

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Nodal segments (4 ± 1 mm long) of Hibiscus moscheutos (hardy hibiscus) were excised from in vitro proliferating microshoots and utilized to evaluate initial factors involved in bulk alginate encapsulation. The factors evaluated were; storage vessel type, volume and multiple rinse effects of CaCl2 solutions, and sodium alginate concentrations (2.5, 2.75, 3.0 or 3.25%) for bulk alginate encapsulation. Results indicate that vessels utilized for bulk alginate encapsulation should have a lower base area (L × W) to height ratio to reduce the amount of alginate matrix shrinkage resulting in exposure of nodal segments. Increased volumes and multiple 50 mM CaCl2 solution rinses did not have an effect on alginate solidification. Shoot length, root number, and root length significantly decreased in a linear manner from nodal explants stored for 4 weeks with increasing concentrations of sodium alginate. This research suggests an innovative technique for alginate encapsulation of H. moscheutos utilizing bulk methods as an alternative to single bead alginate encapsulation.

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Fig. 1
Fig. 2



Driver and Kuniyuki Walnut nutrient salt formulation


Thidiazuron, N-phenyl-N′-1,2,3-thiadiazol-5-yl urea


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Correspondence to Todd P. West.

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West, T.P., Preece, J.E. Bulk alginate encapsulation of Hibiscus moscheutos nodal segments. Plant Cell Tiss Organ Cult 97, 345–351 (2009). https://doi.org/10.1007/s11240-009-9525-y

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  • Germplasm preservation
  • Hardy hibiscus
  • In vitro conservation
  • Microencapsulation
  • Micropropagation