• 생명과학회지
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• 제20권5호
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• pp.745-749
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• 2010

본 연구는 옥수수 뿌리에서 cytokinin ($N^6$-benzyladenine; BA)과 IAA를 각각 혹은 같이 처리하여 ethylene 생성에 미치는 영향을 알아보았다. 두 호르몬을 외부에서 동시에 처리하면 ethylene 생성은 각각 처리하였을 때 보다 함께 처리하면 상승적으로 증가하였다. 예를 들면, $10^{-4}\;M$ BA와 $10^{-4}\;M$ IAA를 처리하면 ethylene 생성량은 각각 대조구의 87%와 170% 증가되지만 함께 처리하면 대조구의 480%가 증가된다. 이러한 상승적 효과는 에틸렌생성에 관여하는 효소인 ACC synthase의 활성과 유전자 발현 수준에서도 볼 수가 있었다. 그러나 에틸렌 생성에 관여하는 다른 효소인 ACC oxidase의 활성에서는 관찰되지 않았다. 이러한 결과는 cytokinin인 BA와 IAA가 옥수수 뿌리에서 ACC synthase에 영향을 미쳐 ethylene 생성을 상승적으로 촉진시킨다는 사실을 제시한다.

• 한국약용작물학회지
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• 제11권4호
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• pp.316-320
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• 2003

A protocol is described for rapid multiplication of Zanthoxylum piperitum DC. (Rutaceae), an important aromatic and medicinal plant, through shoot-tip explant cultures. Murashige and Skoog (MS) medium supplemented with various concentrations of N-6-benzyladenine (BA), N-6-benzylaminopurine (BAP) and thidiazuron (TDZ), in single or in combination with ${\alpha}-naphthaleneacetic$ acid (NAA), was used to determine the rate of shoot proliferation. N-6-benzyladenine (BA) used at 0.5mg/l, was the most effective in initiating multiple shoot proliferation at the rate of 23 microshoots per shoot-tip explants after 40 days of culture. Shoot multiplication increased 1.2-fold in each successive subculture. Induction of rooting (98%) was achieved by transferring the shoots to the same basal medium containing 2 mg/l indole-3-butyric acid (IBA). Plantlets went through a hardening phase in a controlled growth chamber, prior to in vivo transfer. These results represented that possible application for the mass production of plantlets through in vitro culture system of Zanthoxylum piperitum DC.

• 생명과학회지
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• 제16권3호
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• pp.510-515
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• 2006

담배에서 기내 생장, 엽록소 및 광합성 효소인 rubisco와 rubisco activase에 미치는 벤질 아데닌(BA)의 영향을 연구하였다. 여러 농도의 BA 처리 후 11주에 2 ${\mu}M$의 농도에서 기내 생장과 엽록소의 함량이 가장 현저하였다. Rubisco의 함량은 BA의 농도가 증가함에 따라 같이 증가하여 2 ${\mu}M$에서 가장 높았으나, 이후 농도의 증가에 따라 감소함으로서 억제 현상을 보였다. Rubisco의 활성 또한 함량과 같은 현상을 나타냈다. 이 결과들은 rubisco의 활성이 함량과 연관되어 있음을 의미한다. Rubisco에 대한 이러한 효과가 rubisco activase와 관련되어 있을 것이라는 가정하에 이 효소의 함량과 활성을 측정한 결과, 2 ${\mu}M$ BA에서 가장 증가하였다. 이러한 결과들을 종합하면 BA에 의한 rubisco의 활성화 효과는 rubisco activase와 관련되어 있음을 보여준다.

• Plant Biotechnology Reports
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• 제2권4호
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• pp.245-252
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• 2008

The genetic status of somatic embryo-derived plantlets of Cymbopogon flexuosus was examined by randomly amplified polymorphic DNA (RAPD) analysis. Auxins such as 2, 4-dichlorophenoxyacetic acid (2, 4-D) (1-4 mg/l) were used in Murashige and Skoog (MS) medium for induction of calli from rhizomatous explants of Cymbopogon flexuosus. Optimum calli were induced on MS medium supplemented with 2, 4-dichlorophenoxyacetic acid (2, 4-D) (3.5 mg/l) alone or in combination with $N^6-benzyladenine$ (2 mg/l). Somatic embryogenesis was achieved from long term calli when cultured on MS medium containing 2, 4-dichlorophenoxyacetic acid (2, 4-D) (2 mg/l) along with $N^6-benzyladenine$ (BA) (1-2 mg/l). Regeneration was achieved when freshly induced embryogenic calli were sub-cultured on MS medium supplemented with $N^6-benzyladenine$ (3 mg/l) alone. Long-term cultured embryos showed profuse minute rooting on regeneration medium supplemented with N6 -benzyladenine (3 mg/l). Microshoots were rooted in the presence of indole-butyric acid (IBA) (2 mg/l). DNA samples from the mother plant and 18 randomly selected regenerated plants from a single callus were subjected to RAPD analysis with 6 arbitrary decamer primers for the selection of putative somaclones. A total of 64 band positions were scored, out of which 19 RAPD bands were polymorphic. From genetic similarity coefficient based on RAPD band data sharing, it was found that the majority of the clones were almost identical or more than 92% similar to the mother plant, except CL2 and CL9 (66%) which showed highest degree of genetic change with CL2 and CL9 showing presence of two non-parental bands each.

• Plant Resources
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• 제8권3호
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• pp.286-292
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• 2005

Shoot induction system was developed in the recalcitrant plant species, Brassica rapa ssp. rapifera by using optimum selection of profit organ, phytohormone combination, seedling age and kind of culture container. Out of in vitro cultured leaf segment, petiole, hypocotyl, and cotyledon with petiole, only cotyledon with petiole derived from 4 day-old seedlings induced multiple shoot. The optimum combination of auxin and cytokinin for the multiple shoot induction was MS medium containing 5mg/L BA and 0.5mg/L NAA. The major factors for multiple shoot propagation were part of plant organ, age of seedling, and ratio of auxin and cytokinin. In addition, shoot regeneration was promoted in the 100ml Erlenmeyer flask compared with the $90mm{\times}20mm$ Petri-dish. The induced shoots formed roots easy on MS medium containing 0.1mg/L IBA and the whole plants were successfully cultivated in soil.

• Plant Resources
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• 제7권3호
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• pp.222-225
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• 2004

In Japan, propagation of cyclamen is mainly from seedlings. However, seeds are expensive and germination is slow and non..uniform. Therefore, to achieve genetically uniform propagation, multiplication must be vegetative. The rooted tuberous stems without shoots as sources of explants were cultured on the media containing BA and sucrose. After 30 days cultivation, tuberous roots were produced from the root ends attached to a tuberous stem and its capability was dependent on the type of media. The highest percentage of tuberous root formation was observed in Culture on the medium of 1/3 MS containing 0.05mgL$^{-1}$ NAA, 0.5mg L$^{-1}$ BA and 5% sucrose. Growth rates of the tuberous roots were greatly influenced by the cutting positions of a root in explants. The highest growth of was observed if small amount of root end was cut at initiation of tissue culture.

• 한국작물학회지
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• 제47권5호
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• pp.352-355
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• 2002

Mature embryos of five oat genotypes were cultured to develop an efficient method of callus induction and plant regeneration. Murashige and Skoog(MS) and N6 media supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D) and kinetin were used for callus induction. Percentage of callus induction showed significant among the combinations of plant growth regulators. Callus induction showed high efficiency in medium containing 3 mg/$\ell$ of 2,4-D. The high frequency of callus induction was obtained in Gwiri37. For plant regeneration, calli induced from mature embryos were transferred onto MS and N6 media supplemented with combinations of 6-benzyladenine (BA) and naphthaleneacetic acid (NAA) for 5 weeks. Percentage of plant regeneration showed high in MS medium containing 0.2 mg/$\ell$ of NAA and 1 mg/$\ell$ of BA. The callus initiation medium affected the subsequent plant regeneration. Treatment with 3 mg/$\ell$ of 2,4-D, and 3 mg/$\ell$ of 2,4-D and 3 mg/$\ell$ of kinetin in callus induction media showed high frequency for plant regeneration. Plant regeneration frequency among the genotypes showed significant. Especially, Gwiri37 showed high regeneration frequency. Regenerated shoots were treated with 200, 350 and 500 mg/$\ell$ of indole-3-butyric acid (IBA) transferred onto half-strength MS medium without plant growth regulators. Treatment of shoots with IBA induced root formation rapidly.

• 한국약용작물학회지
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• 제10권2호
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• pp.116-119
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• 2002

번행초(Tetragonia tetragonoides)의 잎 절편으로부터 기내(in vitro) 증식을 유도 하였다. 2 mg/L BA와 0.5 mg/L NAA가 조합 처리된 MS 기본배지에서 잎 절편으로부터 직접 기관형성 과정을 통하여 부정아가 형성 되었다. 유기한 부정아는 절취하여 2 mg/L NAA와 0.5 mg/L BA이 첨가된 MS배지로 옮겨 유묘의 대량 증식을 시도하였으며, 배양 3주 후 신초의 지속적인 성장을 위해 무기염의 농도가 두배로 증가된 2MS배지로 옮겨 배양 하였다. 증식된 신초로부터 발근은 식물성장조절물질이 첨가되지 않은 1/2MS와 MS배지 모두에서 이루어 졌다.

• 한국약용작물학회지
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• 제14권2호
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• pp.92-95
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• 2006

A method for plant regeneration via organogenesis from Pelagonium inquinans leaf disc has been developed. Mature leaf explants were collected from field-grown plants and used for the induction of adventitious shoot regeneration on Murashige and Skoog (MS) medium supplemented with 3% (w/v) sucrose plus plant growth regulators. Maximum shoot organogenesis, with $11.8{\pm}1.5$ shoots (98.6%) per leaf disc, was obtained with $2\;mg/l$ $N^6-benzyladenine$ (BA) and $0.5\;mg/l$ ${\alpha}-naphthyleneacetic$ acid (NAA) in 30 days. For rooting, the in vitro proliferated and elongated shoots were excised into 1.5-2 cm in length microcutting, which were plated individually on an half-strength MS (1/2MS) medium supplemented with 2% (w/v) sucrose plus various concentrations of indole-3-butyric acid (IBA). Shoots rooted with a frequency of 100% following culture on 1/2MS medium containing $0.5\;mg/l$ IBA.

• Journal of Plant Biotechnology
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• 제41권1호
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• pp.33-37
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• 2014

Lychnis wilfordii (Regel) Maxim is a rare and valued ornamental plant. Germination rate reached 46.6% when seeds were treated with $100mg{\cdot}l^{-1}$ GA (Gibberellic acid). The highest callus induction was observed in the leaf explants of the seedlings on MS medium containing specific concentrations of $0.5mg{\cdot}l^{-1}$ BA ($N^6$-benzyladenine) and $3.0mg{\cdot}l^{-1}$ NAA (a-naphthalene acetic acid). The adventitious shoot was formed in 97.3% of calli on 1/2 WPM (Woody Plant Medium) medium. Shoot elongation of in vitro propagated plantlets was no difference among various medium. The plantlets grew well after transferring to the pot. This in vitro propagation protocol should be useful for conservation of this endangered plant.