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Cytohistological study of the leaf structures of Panax ginseng Meyer and Panax quinquefolius L.

  • Lee, Ok Ran (Department of Plant Biotechnology, College of Agriculture and Life Science, Chonnam National University) ;
  • Nguyen, Ngoc Quy (Department of Plant Biotechnology, College of Agriculture and Life Science, Chonnam National University) ;
  • Lee, Kwang Ho (Department of Wood Science and Landscape Architecture, College of Agriculture and Life Science, Chonnam National University) ;
  • Kim, Young Chang (Department of Herbal Crop Research, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Seo, Jiho (Research and Development Headquarters, Korea Ginseng Corp)
  • 투고 : 2016.01.18
  • 심사 : 2016.08.02
  • 발행 : 2017.10.15

초록

Background: Both Panax ginseng Meyer and Panax quinquefolius are obligate shade-loving plants whose natural habitats are broadleaved forests of Eastern Asia and North America. Panax species are easily damaged by photoinhibition when they are exposed to high temperatures or insufficient shade. In this study, a cytohistological study of the leaf structures of two of the most well-known Panax species was performed to better understand the physiological processes that limit photosynthesis. Methods: Leaves of ginseng plants grown in soil and hydroponic culture were sectioned for analysis. Leaf structures of both Panax species were observed using a light microscope, scanning electron microscope, and transmission electron microscope. Results: The mesostructure of both P. ginseng and P. quinquefolius frequently had one layer of non-cylindrical palisade cells and three or four layers of spongy parenchymal cells. P. quinquefolius contained a similar number of stomata in the abaxial leaf surface but more tightly appressed enlarged grana stacks than P. ginseng contained. The adaxial surface of the epidermis in P. quinquefolius showed cuticle ridges with a pattern similar to that of P. ginseng. Conclusion: The anatomical leaf structure of both P. ginseng and P. quinquefolius shows that they are typical shade-loving sciophytes. Slight differences in chloroplast structure suggests that the two different species can be authenticated using transmission electron microscopy images, and light-resistant cultivar breeding can be performed via controlling photosynthesis efficiency.

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