• Journal of Plant Biology
• /
• 제32권3호
• /
• pp.145-150
• /
• 1989

Mature zygotic embryos dissected from ginseng(Panax ginseng C. A. Meyer) seeds were cultured on Murashige and Skoog's (MS) medium containing various concentrations of 2, 4-dichlorophenoxyacetic acid(2, 4-D) and kinetin. Somatic embryos were induced directly from cotyledonary tissue or from intervening callus. The induction frequency of somatic embryos was up to 55%. Upon transfer to half-strength MS medium supplemented with 1 mg/1 6-benzyladenine(BA) and 1 mg/1 GA3, most somatic embryos developed into plantlets. Over 50% of the plantlets flowered after 4 weeks of culture and then a few bore immature fruits in vitro. Therefore, it is suggested that the juvenility of the ginseng tissue which give rise to somatic embryos does not interfere with in vitro flowering of their regenerated plantlets.

• 한국자원식물학회지
• /
• 제23권3호
• /
• pp.233-241
• /
• 2010

In vitro elimination of Sweet potato leaf curl virus (SPLCV) from infected sweet potato is difficult due to low number of virus-free plants obtained from meristem tip culture and long growth period required for the virus detection. In this study, efficient production of the SPLCV-free sweet potato by in vitro therapy coupled with a PCR assay for virus detection was investigated. Infected shoots cultured on Murashige and Skoog medium were treated at three different temperatures for 7 weeks followed by meristem tip culture on the medium with or without ribavirin at 50 mg/L. The regenerated plantlets were tested for virus infection by a PCR assay. The results showed that the both heat- and cold-treatments, and addition of the ribavirin did not have significant effect on efficiency of the virus elimination. The meristem size, however, greatly affected the survival rate. Meristems sized over 0.4 mm survived better than smaller ones (0.2-0.3 mm). The PCR assay was approved to be a rapid, sensitive and reliable for the SPLCV detection in regenerated plantlets. Therefore, combination of cultivating meristem tips sized 0.4-0.5 mm on the medium at $22^{\circ}C$ without ribavirin and detection of SPLCV in the regenerated plantlets by the PCR assay was an efficient system for the SPLCV elimination from infected sweet potato.

• 한국자원식물학회지
• /
• 제35권4호
• /
• pp.502-507
• /
• 2022

본 연구는 약용식물자원인 땅꽈리 유식물의 하배축 절편으로부터 부정아 형성을 통한 재분화를 조사하여 효율적인 재분화 조건을 확립하고자 하였다. 신초는 저농도 BAP를 함유하는 MS 배지에서 효과적으로 유도되었다. 신초 유도는 BAP 0.5~1.0 mg/L를 단독으로 또는 NAA 0.1~0.5 mg/L와 함께 처리한 MS 배지에서 활발히 이루어졌으며, 특히 BAP 1.0 mg/L가 포함된 MS 배지가 가장 효과적이어서 다발성 신초가 왕성하게 형성되었다. 유도된 신초를 뿌리 유도 배지로 옮겼을 때, 저농도의 NAA, IBA, IAA에서 뿌리가 잘형성되어 재분화 식물체를 만들어 내기에 적절하였다. 발근 수와 뿌리의 길이는 각각평균 2.0개, 8.0 cm 이상으로 높게 나타났다. 특히, 0.03 mg/L의 NAA, IBA, IAA를 포함한 MS 배지에서 뿌리가 더잘 성장하고, 뿌리의 전체적인 형태도 양호하였다. 그리고, 저농도의 NAA, IBA, IAA를 함유하는 MS 배지에서 새로운 신초의 형성도 잘 이루어져서, 줄기의 수가 2개 이상으로 많이, 그리고 길이는 6.0 cm 이상으로 길게 신장하였다. 배양토에 이식한 재분화 식물체는 100%의 생존율을 보였으며, 모두 정상적인 성체로 생장하였다. 따라서 땅꽈리의 부정아 형성을 이용한 재분화 식물체의 생산은 개체들을 대량 증식할 수 있어 균질한 조원료를 안정적으로 공급하는데 주요 수단이 될 것으로 보인다.

• Journal of Plant Biotechnology
• /
• 제36권2호
• /
• pp.174-178
• /
• 2009

Presently, we report a simple, reproducible and high frequency plant regeneration in Hibiscus syriacus L. using axillary buds. H. syriacus was regenerated from axillary buds directly or through a callus phase. Regenerated shoots were directly induced from young and fresh axillary buds cultured on Murashige and Skoog medium (MS) supplemented with 0.01 mg/L of the growth regulator thidiazuron (TDZ) after 2 weeks of culture. Directly induced shoots were transferred to hormone-free MS medium and root development was observed after 6 weeks. On the other hand, old and stale axillary buds were regenerated to shoots via callus induction on MS medium containing 0.01–2 mg/L TDZ after 4 weeks. A TDZ concentration of 0.01 mg/L was most effective in callus formation. Green callus was transferred to MS medium containing 0.01 mg/L α-naphthalene acetic acid (NAA) and 0.5 mg/L benzylaminopurine (BA). After 4 weeks, callus had developed into multiple shoots. Plantlets were formed from 10 week cultures of single shoots on hormone-free MS medium. Regenerated plantlets were cultured on MS medium for one month and then transferred to pots containing garden soil. Potted plants were acclimatized for one month and grown to maturity under greenhouse conditions. The present study has shown that various concentrations of plant growth regulator can be effective for in vitro plant regeneration of H. syriacus. The direct and indirect regeneration protocol presented here will be useful for understanding the manipulation and propagation of H. syriacus.

• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2005년도 International Symposium & conference of the Plant Resources Society of Korea
• /
• pp.190-190
• /
• 2005

• Journal of Applied Biological Chemistry
• /
• 제42권3호
• /
• pp.113-118
• /
• 1999

The transgenic plant of Citrus species (Citrus aurantium L.) was constructed with a fatty acid desaturase gene using microprojectile bombardment transformation system. The DNA of a fatty acid desaturase gene, fad7, constructed in pBI121 was coated onto tungsten particles ($1.1{\mu}m$) and introduced into callus cells by bombarding with 1100 psi of helium pressure, 1/4 in of gap distance, 7.0 cm of target distance and 27 in Hg of chamber vacuum. The bombarded cells were selected on the medium containing kanamycin. The selected cells were successfully regenerated into plantlets via somatic embryogenesis on the media containing plant growth regulators. The results of polymerase chain reaction analysis of genomic DNAs from the putative transformants showed that the introduced DNAs of fad7 were present in both the selected callus cells and the regenerated plantlets.

• Plant Resources
• /
• 제1권2호
• /
• pp.109-112
• /
• 1998

Aloe in vitro culture was attempted to induce callus and regeneration ability from different explant sources onto MS medium with 0.5mg/l NAA plus 1.0mg/l BA. Anthers that no developed any callus and plant regeneration, while only four out of 274 filament explants induced calli at cut edge without regenerated plants. Twenty ovary explants regenerated four direct plantlets without via callus from the base of epidermal tissues. Regenerated plants on the root tip gave 2n=14 of chromosome numbers.

• Journal of Ginseng Research
• /
• 제40권4호
• /
• pp.409-414
• /
• 2016

Background: The low survival rate of in vitro regenerated Panax ginseng plantlets after transfer to soil is the main obstacle for their successful micropropagation and molecular breeding. In most cases, young plantlets converted from somatic embryos are transferred to soil. Methods: In vitro thickened taproots, which were produced after prolonged culture of ginseng plantlets, were transferred to soil. Results: Taproot thickening of plantlets occurred near hypocotyl and primary roots. Elevated concentration of sucrose in the medium stimulated the root thickening of plantlets. Senescence of shoots occurred following the prolonged culture of plantlets. Once the leaves of plantlets senesced, the buds on taproots developed a dormant tendency. Gibberellic acid treatment was required for dormancy breaking of the buds. Analysis of endogenous abscisic acid revealed that the content of abscisic acid in taproots with senescent shoots was comparatively higher than that of taproots with green shoots. Thickened taproots were transferred to soil, followed by exposure to gibberellic acid or a cold temperature of $2^{\circ}C$ for 4 mo. Cold treatment of roots at $2^{\circ}C$ for 4 mo resulted in bud sprouting in 84% of roots. Spraying of 100 mg/L gibberellic acid also induced the bud sprouting in 81% roots. Conclusion: Soil transfer of dormant taproots of P. ginseng has advantages since they do not require an acclimatization procedure, humidity control of plants, and photoautotrophic growth, and a high soil survival rate was attained.

• 식물조직배양학회지
• /
• 제26권2호
• /
• pp.85-91
• /
• 1999

고구마의 정단분열조직을 배양하여 생장조절제의 종류와 농도 및 정단분열조직의 크기에 따른 다아체 증식효과를 조사하였다. NAA와 BA 혼용처리의 경우 0.1 ㎎/L NAA에 2.0 ㎎/L BA혼용처리에서 '목포 29호'와 '산천자'의 경우 배양 30일 후에 100% shoot분화율을 보였고, 뿌리발생률은 '목포 29호'는 66.7%, '산천자'는 69.2%였으며 줄기의 기부 부분에서 형성되었다. Cytokinin류인 kinetin과 BA 0.5∼4.0 ㎎/L 단독처리에서 다아체 분화율이 좋았으며 발달된 shoot의 대부분은 배양 60일 이내에 뿌리발생과 더불어 정상적인 식물체로 재분화되었다. 반면에 '금시'에서는 cytokinin류 단용처리에서 분화된 shoot가 캘러스화되어 정상적인 shoot를 생산하지 못하였다. 캘러스로 덮인 다아체의 shoot가 1∼2마디로 신장된 shoot를 분리하여 4.0 ㎎/L BA 또는 kinetin 처리구에 계대배양하였을 때, 분할된 shoot의 대부분이 줄기의 기부에 캘러스가 형성되면서 계대배양 30일 후에는 정상적인 shoot와 뿌리를 가진 재분화된 식물체의 생산이 가능하였다.

• 식물조직배양학회지
• /
• 제25권2호
• /
• pp.125-129
• /
• 1998

기내에서 무균 발아시킨 오이 유식물체의 자엽절편과 하배축으로부터 기관발생 및 체세포배 발생 경로를 통한 식물체 재분화 시스템을 개발하였다. 자엽절편을 1,0mg/L zeatin과 0.1mg/L IAA가 첨가된 MS 배지에서 4주간 배양하였을 때 사용한 모든 품종에서 부정아의 형성이 가장 양호하였다. 자엽절편의 기저부에서 유도된 부정아를 0.2mg/L IAA가 첨가된 MS 배지에 이식하여 뿌리를 유도하여 완전한 소식물체로 발달시켰다. 한편, 하배축을 약 5-10mm 크기로 절단하여 1.0mg/L 2,4-D가 첨가된 MS 배지에서 배양하였을 때 낙합계 품종에서 배발생 캘러스가 유도되었다. 같은 조건의 배지에서 2-3주 간격으로 계대배양을 실시하면서 배발생 캘러스만을 선발하여 유지 및 증식시켰다. 배발생 켈러스를 2,4-D가 첨가되지 않은 MS 배지에 옮겨 배양하였을 때 약 1주 후부터 배발생 캘러스로부터 구상형 시기의 체세포배가 발생하였다. 그리고 이들은 심장형, 어뢰형 및 자엽기 시기를 거처 발아하여 소식물체로 발달하였다. 자엽절편 및 하배축 배양으로부터 유도된 소식물체는 잎이 2-3장 정도 되었을 때 화분에 옮겨 온실에서 순화시켜 과실을 얻을 수 있는 완전한 식물체로 재분화시킨다.