Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Effects of altering medium strength and sucrose concentration on in vitro germination and seedling growth of Cypripedium macranthos Sw.

  • Huh, Yoon Sun (Horticultural Research Division, Chungcheongbuk-do Agricultural Research and Extension Services) ;
  • Lee, Joung Kwan (Horticultural Research Division, Chungcheongbuk-do Agricultural Research and Extension Services) ;
  • Nam, Sang Young (Horticultural Research Division, Chungcheongbuk-do Agricultural Research and Extension Services) ;
  • Hong, Eui Yon (Horticultural Research Division, Chungcheongbuk-do Agricultural Research and Extension Services) ;
  • Paek, Kee Yoeup (Department of Horticultural Science, Chungbuk National University) ;
  • Son, Sung Won (Plant Conservation Division, Korea National Arboretum of the Korea Forest Service)
  • Received : 2016.02.11
  • Accepted : 2016.03.15
  • Published : 2016.03.31
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Abstract

The genus Cypripedium, known as lady's slipper orchid, has been considered to have a considerable marketability as a potted and garden plant with beautiful flowers; however, this species is becoming endangered and, in some places extinct, due to habitat destruction and illegal collections. As such, an optimized artificial propagation system is necessary for its conservation and horticultural cultivation. For the establishment of the in vitro proliferation of the endangered Cypripedium macranthos Sw., native to Korea, the effects of medium strength and sucrose concentrations on germination, protocorm formation and seedling growth were investigated through asymbiotic seed culture. The highest germination rate and protocorm formation rate were obtained with a 1/4 MS medium; higher MS medium strengths did not generate the favorable conditions required for germination and protocorm growth. The overall growth characteristics of roots and buds developed from protocorms were best in cultures of 1/4 MS medium. On this medium containing $10g{\cdot}L^{-1}$ sucrose, both the germination rate and protocorm formation rate increased significantly. The general growth properties of seedlings developed on the medium with $10g{\cdot}L^{-1}$ sucrose were best, showing the highest bud formation rate and root number. Our results demonstrate that the 1/4 MS medium, supplemented with $10g{\cdot}L^{-1}$ sucrose, could improve in vitro germination, and facilitate the growth of seedlings developed from the protocorms of C. macranthos Sw.

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