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Optimal culture methods for plant regeneration via shoot organogenesis in the 'Fuji' apple

사과 '후지'의 기관형성을 통한 식물체 재생에 효율적인 배양방법

  • Yoon Kyung Lee (Department of Plant and Food Sciences, Sangmyung University) ;
  • Youngju Kwon (Department of Plant and Food Sciences, Sangmyung University) ;
  • Yong Joon Yang (Department of Plant and Food Sciences, Sangmyung University)
  • 이윤경 (상명대학교 식물식품공학과) ;
  • 권영주 (상명대학교 식물식품공학과) ;
  • 양용준 (상명대학교 식물식품공학과)
  • Received : 2023.09.14
  • Accepted : 2023.09.18
  • Published : 2023.10.13

Abstract

Plant regeneration protocols for adventitious shoot organogenesis from apple (Malus domestica 'Fuji') leaf explants were developed in the present study. The effects of dark incubation periods in the early stages of culture, pre-treatment methods, the number of explants per culture container, the type of culture containers, and the orientation of the explants on culture media were evaluated to determine the optimal shoot regeneration conditions for 'Fuji' apple leaf explants. Light incubation of explants produced minimal response. However, dark incubation of explants for 4 weeks during the initial culture period enhanced shoot regeneration frequency. Comparing the number of explants per container, a higher percentage of shoot regeneration was obtained with nine explants per container compared with four explants per container. Pre-treatment, before culture, by dipping explants in a liquid regeneration medium containing 40 g/L of sorbitol for 2 hours produced the highest shoot formation rate, and the time of shoot formation was accelerated. The percentage of shoot regeneration and number of shoots per regenerating explant reached a maximum of 87.5% and 4.7, respectively. The regenerated shoots were elongated and rooted on a rooting medium of 1/4 MS with 0.2 mg/L IBA. The plantlets were successfully acclimatized, and the regenerated plants produced normal phenotypes.

사과 '후지'의 잎 절편체로부터 신초 기관형성을 통한 효율적인 식물체 재생 시스템을 확립하기 위하여 암처리 기간, 전처리 방법, 배양 용기당 치상 절편체 수, 배양 용기의 종류와 배지 위의 절편체 치상방향 등을 달리하여 실험을 실시하였다. 배양 초기 암조건에서의 배양은 신초 형성에 필수적이며, 4주 동안 배양한 후 명조건으로 옮겨 배양하는 것이 신초 재생에 가장 효과적이었다. 배양 전 전처리로는 sorbitol 40 g/L가 포함된 액체 재생배지에 2시간 동안 침지하였을 때 신초 형성율이 87.5%까지 증가하였으며, 신초 형성 시기가 빨라지는 것으로 나타났다. 배양 용기당 치상 절편체 수는 9개를 치상하는 것이 신초 재생에 효과적이었으며, 배양 용기는 100 ml 삼각플라스크를 사용하는 것이 petri dish를 사용하는 것에 비해 신초 형성율이 약 3배 정도 증가하였다. 잎절편체의 배지 위 치상방향은 배축면이 배지에 닿게 치상했을 때, 신초 형성율과 재생된 신초수가 다소 높게 나왔다. 암조건에서 4주간 배양한 후 명조건으로 옮겨총8주간 배양하여 재생된 신초는 1/4 MS에 0.2 mg/L의 IBA가 첨가된 배지에서 발근을 유도한 후 활착시켜 온실에서 재배하였을 때 정상적인 표현형을 보여주었다.

Keywords

Acknowledgement

본 연구는 고인이 되신 형남인 교수님의 지도로 이루어진 것이며 이에 깊은 감사와 존경을 표합니다.

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