Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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In vitro plantlets regeneration by multi-shoots induction and rooting in Chamaecyparis obtusa

편백의 다신초 유도 및 발근을 통한 식물체 재분화

  • Kim, Ji Ah (Division of Forest Biotechnology, National Institute of Forest Science) ;
  • Lee, Na-Nyum (Division of Forest Biotechnology, National Institute of Forest Science) ;
  • Kim, Yong Wook (Division of Forest Biotechnology, National Institute of Forest Science)
  • 김지아 (국립산림과학원 산림생명공학연구과) ;
  • 이나념 (국립산림과학원 산림생명공학연구과) ;
  • 김용욱 (국립산림과학원 산림생명공학연구과)
  • Received : 2019.11.11
  • Accepted : 2019.11.26
  • Published : 2019.12.31
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Abstract

A protocol for the in vitro propagation of Chamaecyparis obtusa was established in the present study. Multi-shoots were initiated from apical shoot explants from germinants after 10 weeks of culture on Litvay medium (LM) supplemented with different concentrations of cytokinin. The effects of pre-treatment with high concentrations of cytokinin and varying concentrations (0.2 to 5.0 mg/L) of zeatin on in vitro shoot elongation and shoot multiplication were investigated. Optimal shoot growth was achieved on LM medium, with over 10-mm shoots after 10 weeks of culture. In the anti-browning tests, ethanesulfonic acid triggered the least browning in the shoot tips. The highest multi-shoot induction was observed in the 0.5-mg/L zeatin treatments, which yielded 80% induction of shoots after 10 weeks of culture, and maximum shoot elongation was observed in the LM basal medium without the hormone. The highest rooting rates were 65% under 0.2 mg/L indole-3-butyric acid.

본 연구에서는 편백의 다신초 유도를 통한 기내 식물체 재분화기술을 개발하고자 본 연구를 수행하였다. 이를 위해 먼저 다신초 유도를 위한 적정 싸이토키닌의 종류 및 농도별 처리에서 1/2LM배지에 0.2 mg/L zeatin의 처리구에서 가장 높은 73%였으며, 절편체 당 평균 3.9개 다신초가 유도되었다. 그리고 싸이토키닌의 고농도→저농도의 순차적 처리의 경우 5.0 mg/L→0.5 mg/L zeatin 처리구에서 100%의 신초 유도율과 절편체 당 17.1개의 가장 많은 다신초가 유도되어 다신초 유도를 위한 최적 조건으로 확인되었다. 신초의 길이신장을 위한 배지는 LM배지에서 배양할 경우 2.62 cm로 가장 좋은 길이생장의 결과를 얻었다. 신초정단부의 갈변화 현상을 억제하기 위해 항산화제 처리 결과 0.5% MES처리구에서 37.5%의 갈변화증상만이 보여 무처구에 비해 2.5배 이상 갈변화 억제 효과가 있었으며, 그에 따른 줄기 길이 신장 또한 1.3 cm로 가장 좋게 나타났다. 신초의 발근은 0.2 mg/L IBA처리구에서 65% 발근율과 3.9개 뿌리가 유도되어 가장 효과적인 처리구였으며, 이렇게 재분화된 기내식물체는 순화를 거쳐 현재 생육포지에서 활발히 생육 중에 있다.

Keywords

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