Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Microtuber Formation from In Vitro Codonopsis lanceolata Plantlets by Sugar

탄소급원처리에 의한 기내 더덕 식물체의 비대근 형성

  • Kim, Ji-Ah (Division of Forest Biotechnology, Korea Forest Research Institute) ;
  • Moon, Heung-Kyu (Division of Forest Biotechnology, Korea Forest Research Institute) ;
  • Choi, Yong-Eui (Department of Forest Resources, Kangwon National University)
  • 김지아 (국립산림과학원 산림생명공학과) ;
  • 문흥규 (국립산림과학원 산림생명공학과) ;
  • 최용의 (강원대학교 산림자원학과)
  • Received : 2013.07.11
  • Accepted : 2013.08.28
  • Published : 2013.09.30
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Abstract

In this experiment, we report for the first time mass propagation by in vitro mircrotuberization of Codonopsis lanceolata. We first examined the effect of cytokinins on multiple shoot induction. 2.0 $mg{\cdot}L^{-1}$ of kinetin not only gave the highest rate of shoot induction (19.1%) but also the elongation of shoot (17.1 mm). Secondly, we investigated the effect of sugars on in vitro microtuberization from nodal segments. The diameter of tuberous roots was enlarged in the half-strength MS medium supplemented with 145.9 mM sucrose. Histological analysis revealed that the number of parenchymatous cell containing starch grains increased in the tuberous roots. In addition, unlike in non-tuberous root, vascular bundles were scattered inner cortex layer. Thirdly, in order to preserve and stimulate the germination, microtubers were stored at $4^{\circ}C$ refrigerator during 9 months and then transplanted to the artificial soils (vermiculrite : peatmoss = 1:1 v/v), resulting that the rates of survival and germination were 75% and 70%, respectively. These results indicated that mass propagation of C. lanceolata was achieved by in vitro microtuber formation, suggesting that this protocol might be applied for not only the propagation of elite clones but also conservation of C. lanceolata germplasm.

이 실험에서 우리는 더덕의 기내 소비대근형성에 의한 대량생산을 처음으로 보고하였다. 첫번째로, 다경지유도를 위한 싸이토키닌의 효과를 실험하였다. 2.0 $mg{\cdot}L^{-1}$ kinetin 처리는 줄기유도비율(19.1%)뿐만 아니라 줄기의 길이신장(17.1 mm)이 가장 높았다. 두번째로, 절간절편에서 유도되는 기내 소비대근형성에서 탄소급원의 효과를 연구하였다. 비대근의 직경은 1/2 MS배지에 145.9 mM Suc첨가시 증가하였다. 조직학적 분석은 비대근 내에 전분입자가 포함된 유세포의 수가 증가하였다. 게다가 세근은 비대근과 달리 관다발이 피층내에 흩어져 존재하였다. 세번째로, 소비대근의 보전과 발아 촉진을 위하여 $4^{\circ}C$ 저온저장고에 9달 동안 저장 후 이것을 인공상토로 이식한 결과 생존율 75%, 발아율 70%라는 결과를 보였다. 이러한 결과 더덕의 대량 번식은 기내 소비대근 형성에 의해 얻을 수 있고 이러한 방법은 우수클론의 번식 뿐만 아니라 더덕 유전자원 보존을 위해 제공될 수 있을 것으로 사료된다.

Keywords

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