Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Micropropagation of a rare plant species, Astragalus membranaceus Bunge var. alpinus N.

희귀식물 제주황기의 미세번식

  • Received : 2014.06.02
  • Accepted : 2014.06.26
  • Published : 2014.06.30
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Abstract

In order to develop an efficient in vitro micropropagation technique for a rare plant species, Astragalus membranaceus Bunge var. alpinus N., shoot proliferation and in vitro or in vivo rootings were conducted and hyperhydrated leaf generated from cultures was histologically observed. During shoot induction, no distinct effect on multiple shoot induction was found between BA and kinetin treatment. BA enhanced the number of internodes, whereas kinetin stimulated shoot elongation. Hyperhydrated leaf composed of bigger cells and retarded palisade parenchyma and showed irregular cell arrangement compared to normal leaf. Especially starch content in hyperhydrated leaf was significantly reduced. The best rooting rate was achieved by B5 medium among three different medium (B5, MS and WPM) and 0.1mg/L IBA treatment induced the highest rooting ratio (80%). No statistical difference was induced by explant types (apical bud or axillary bud) in terms of rooting ratio. In vivo cutting induced rooting rate up to 65% by 0.5% IBA/Talc powder treatment. Although in vivo rooting rate was less efficient compared to in vitro rooting, better survival rate was observed after soil acclimatization. Present study suggested that above micropropagation techniques can be used for rapid multiplication as well as in vitro or in vivo conservation of the species.

희귀 식물 제주황기의 기내번식법 확립을 목적으로 줄기증식 및 발근을 시험하고 배양과정에서 나타나는 잎의 과수화 현상을 조직학적으로 조사하여 다음의 결과를 얻었다. 줄기유도 시 BA 및 kinetin의 처리는 다경유도 효과가 뚜렷하지 않았으며 대부분 단일 줄기로 자랐다. 하지만 BA 처리는 마디 수의 증가를, kinetin 처리는 줄기의 신장을 각각 촉진하는 효과가 있었다. 과수화(hyperhydration)된 잎은 정상 잎에 비하여 세포의 크기가 크고 책상조직의 발달이 부진하였으며, 세포의 배열이 불규칙하였다. 특히 과수화 잎의 세포는 세포 내 전분의 축적이 현저히 감소하는 것으로 나타났다. 기내발근은 세 가지 배지(B5, MS, WPM) 가운데 B5 배지가 양호하였으며, 0.1 mg/L IBA 처리 시 최고의 발근율을 보였다. 발근에 미치는 절편체 위치효과(정아지 혹은 액아지)는 통계적 유의 차가 없는 것으로 나타났다. 기외삽목 발근은 0.5% IBA 분말 처리로 65%까지 발근되어 기내발근 보다 저조하였으나, 차후 생존율은 더 좋은 것으로 나타났다. 이상의 결과는 제주황기의 기내번식이 가능함을 시사하며, 이 식물의 기내 및 기외보존의 방법으로 사용될 수 있음을 보여주었다.

Keywords

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