Journal of Plant Biotechnology

  • Volume 50
  • /
  • Pages.169-175
  • /
  • 2023
  • /
  • 1229-2818(pISSN)
  • /
  • 2384-1397(eISSN)
The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Optimal concentrations of plant growth regulators and AgNO3 for the improvement of regeneration efficiency in Chrysanthemum morifolium 'Ohblang'

국화 '오블랑'의 재생 효율 증진을 위한 식물생장조절제와 AgNO3 적정 농도 선별

  • Yeo Jin Youn (Department of Plant and Food Sciences, Sangmyung University) ;
  • Yong Joon Yang (Department of Plant and Food Sciences, Sangmyung University)
  • 윤여진 (상명대학교 식물식품공학과) ;
  • 양용준 (상명대학교 식물식품공학과)
  • Received : 2023.09.14
  • Accepted : 2023.09.18
  • Published : 2023.10.11
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Abstract

A plant regeneration system was developed through shoot organogenesis from in vitro leaf explants of Chrysanthemum morifolium 'Ohblang'. The effects of different concentrations of plant growth regulators and AgNO3 on efficient shoot regeneration and inhibition of browning were evaluated in chrysanthemum. The explants were cultured on MS shoot induction medium supplemented with 12 combination treatments of 6-benzyladenine (BA) 0.5, 1.0 and 2.0 mg/L, and α-naphthaleneacetic acid (NAA) 0.2, 0.5, 1.0 and 2.0 mg/L in darkness for 6 weeks and cultured under a 16/8 h photoperiod for 6 weeks. The highest shoot regeneration was obtained from the explants cultured on the medium with 1.0 mg/L BA and 1.0 mg/L NAA. Based on this result, AgNO3 was added to a shoot induction medium containing MS salts, vitamins, 1.0 mg/L BA, 1.0 mg/L NAA, 30 g/L sucrose, and 6 g/L agar to reduce browning of chrysanthemum leaf explants. In the control treatment without AgNO3, leaf explants turned brown at the cut edge; however, browning was not observed in AgNO3 treatments. Shoot organogenesis was higher at low concentrations of AgNO3 and decreased with an increase in AgNO3 concentration. The explants cultured on shoot induction medium (MS salts, vitamins, 1.0 mg/L BA, 1.0 mg/L NAA) with 1 mg/L of AgNO3 produced the highest shoot regeneration with 2.6 shoots per explants and a browning index of 0.7. When the regenerated shoots were detached from the explants and cultured on MS medium, the shoots were elongated and rooted successfully.

국화 '오블랑'의 기내 배양 잎 절편체로부터 신초 기관형성을 통한 식물체 재생 시스템을 확립하는데 있어 효율적인 신초 재생 및 갈변억제를 위한 식물생장조절제와 AgNO3의 농도를 선정하고자 실험을 수행하였다. 잎 절편체를 식물생장조절제인 BA 0.5, 1.0, 2.0 mg/L와 NAA 0.2, 0.5, 1.0, 2.0 mg/L를 조합 처리한 12가지 조성의 배지에 치상하여 암조건에서 6주간, 명조건에서 6주간 배양하였을 때, BA 1.0 mg/L, NAA 1.0 mg/L를 첨가한 배지를 사용하는 것이 가장 효과적이었다. 이 결과를 기반으로 잎 절편체로부터 갈변 감소를 위해 MS 염류와 비타민, BA 1.0 mg/L, NAA 1.0 mg/L, sucrose 30 g/L, agar 6 g/L를 포함한 신초유도배지에 AgNO3 0, 1, 3, 5, 7, 10 mg/L를 각각 첨가하여 실험을 실시하였다. AgNO3 처리는 잎 절편체로부터의 갈변을 감소시키는 효과를 보였으나, 처리 농도가 증가됨에 따라 신초로의 발달은 원활하게 이루어지지 않았다. 결과적으로 AgNO3 1 mg/L를 포함한 신초유도배지(MS 염류와 비타민, BA 1.0 mg/L, NAA 1.0 mg/L)에 잎 절편체를 치상하였을 때, 갈변지수 0.7, 절편체당 신초 수가 2.6개로 '오블랑' 재생에 있어 가장 적합한 농도임을 확인하였다.

Keywords

Acknowledgement

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

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