• Journal of Plant Biotechnology
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• v.6 no.2
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• pp.97-102
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• 2004

This study was carried out to establish The regeneration of healthy seedlings from the nodal segment culture of Chinese yam (Dioscorea opposita cv. Danma), cultivated in Korea. Different explants such as leaves, petioles, roots and nodal pieces, excised from the in vitro grown seedlings of Chinese yam, were cultured on MS medium supplemented with various combinations of growth regulators. All the growth regulators used induced plantlet regeneration from the nodal segments at a high frequency, while there was no induction of shoot or callus from leaf, petiole or root tissues. The medium supplemented with 0.01mg/L NAA, 0.5mg/L BA, 0.5-1.0mg/L kinetin and without plant growth regulator was effective for shoot development of buds from the nodal segment culture. The concentration of BA and NAA was an important factor in the bud induction of buds from the nodal segments of Chinese yam. Nodal segments cultured on the medium containing 1.0mg/L NAA and 0.5-1.0mg/L BA gave the best response to bud formation. The addition of GA$_3$ to the culture medium suppressed shoot induction and growth, while it increased microtuber formation. The shoot growth and microtuber formation were also affected by medium strength and solidity. The MS basal medium containing 1 g/L gelrite was suitable for microtuber formation from the nodal segment of Chinese yam.

• Journal of Plant Biotechnology
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• v.39 no.3
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• pp.205-211
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• 2012

Pueraria lobata is a perennial legume plant, widely distributed in the countries of East Asia. It is a medicinally important leguminous plant and produces various isoflavones such as puerarin, daidzein etc which have potential for preventing several chronic diseases including osteoporosis, cardiovascular disease and cancer. In this study, we tried to induce hairy roots in vitro from Korean wild arrowroot P. lobata and investigated the effects of hormones and light conditions. Initially leaf and stem segments were infected with Agrobacterium rhizogenes and incubated in different conditions. Hairy roots were induced from only stem segments and the induction was best at dark condition and the presence of IBA during incubation. Secondary roots were also significantly much more induced at the dark condition than at the 16 hours light condition. Among plant growth regulators of auxin, IBA was best for secondary root formation while 2,4-D, IAA and NAA produced callus or less hairy roots. The presence of the foreign gene rolC transferred by A. rhizogenes that plays a major role in hairy root induction was confirmed by PCR. The accumulation of isoflavones such as puerarin and daidzin was also confirmed. These results will facilitate mass production of hairy root and can be used for the production of functional substances from wild arrowroots.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2003.10a
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• pp.133-133
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• 2003

• Korean Journal of Plant Resources
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• v.19 no.3
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• pp.427-431
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• 2006

In vitro high-frequency plant regeneration of Muscari comosum var. plumosum through somatic embryogenesis was obtained via two developmental pathways: direct embryos and multiple shoots regenerated from embryogenic callus. Flower bud with pedicel, receptacle, petal and ovary wall, floral stalk and leaf as explants were cultured in MS medium supplemented with various plant growth regulators. Embryos formed directly from pedicel, receptacle and floral stalk. Depending on explant sources, the optimal medium was MS medium supplemented with 0.2 mg/L IBA and 0.3 mg/L BA, 3.0 mg/L IBA and 3.0 mg/L BA, and MS-free medium for pedicel, receptacle, and floral stalk, respectively. Multiple shoots regenerated from embryogenic cal]i which was initiated from petal, ovary and leaf were observed in MS medium with different concentrations and combinations of hormone. The most suitable medium for each type of explant was 3.0 mg/L IBA and 3.0 mg/L BA(petal and ovary) and 5.0 mg/L IBA and 5.0 mg/L BA (leaf) Furthermore, the combination of 0.1 mg/L 2,4-D and 1.0 mg/L BA was also good for all sources of explants not only for direct embryo formation, but also, for embryogenic callus induction.

• Korean Journal of Plant Tissue Culture
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• v.22 no.1
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• pp.19-23
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• 1995

Carrot cultured cells are able to respond to a temperature increase by inducing a set of new proteins, heat shock proteins (HSP). Such an induction of the HS gene was known to be achieved mainly at the level of transcription. However there has been an increasing number of evidences showing that a translational control was involved in the regulation of the HS gene expression. A comparison of HSP synthesized in vivo to in vivo (represent for mRNA level since the amount of the proteins produced by in vivo translation system will be proportional to an amount of the corresponding mRNA)showed no correlation between the amount of HS mRNA and the amount of the corresponding HSP at $30^{\circ}C$, It appears that a translational control may exert a major role in the expression of HS gene in carrot callus cells at $30^{\circ}C$.

• Korean Journal of Plant Tissue Culture
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• v.27 no.6
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• pp.469-474
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• 2000

Effect of the antibiotic carbenicillin on callus and shoot formation from the leaf disc culture of tobacco (Nicotiana tabacum L. cv. BY-4) was examined. The number of shoot induced from the leaf explants was decreased as the amount of carbenicillin increased from 250 mg/L to 2,000 mg/L on MS medium containing 0.5 mg/L of BAP or kinetin. In addition, calli formation from the leaf explants was increased by the treatment of 250 mg/L ∼ 500 mg/L carbenicillin with or without 0.5 mg/L of 2,4-D or NAA. However, the fresh weight of 4-week-cultured explants was decreased with increasing carbenicillin from 250 mg/L to 2,000 mg/L on MS medium containing 0.5 mg/L of 2,4-D or NAA. These results indicate that carbenicillin has an auxin-like effect, such as promoting callus formation and inhibiting shoot induction. It leads to the conclusion that the auxin-like property should be taken into account for the production of transgenic plants via Agrobacterium-mediated transformation.

• Journal of Ginseng Research
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• v.38 no.3
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• pp.220-225
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• 2014

An efficient in vitro protocol has been established for somatic embryogenesis and plantlet conversion of Korean wild ginseng (Panax ginseng Meyer). Wild-type and mutant adventitious roots derived from the ginseng produced calluses on Murashige and Skoog (MS) medium supplemented with 0.5 mg/L 2,4-dichlorophenoxyacetic acid and 0.3 mg/L kinetin; 53.3% of the explants formed callus. Embryogenic callus proliferation and somatic embryo induction occurred on MS medium containing 0.5 mg/L 2,4-dichlorophenoxyacetic acid. The induced somatic embryos further developed to maturity on MS medium with 5 mg/L gibberellic acid, and 85% of them germinated. The germinated embryos were developed to shoots and elongated on MS medium with 5 mg/L gibberellic acid. The shoots developed into plants with well-developed taproots on one-third strength Schenk and Hildebrandt basal medium supplemented with 0.25 mg/L 1-naphthaleneacetic acid. When the plants were transferred to soil, about 30% of the regenerated plants developed into normal plants.

• Korean Journal of Plant Tissue Culture
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• v.26 no.1
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• pp.1-6
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• 1999

In order to obtain plantlet derived by anthers, the anthers of Lilium asiatic hybrid 'Gran Paradiso' were cultured on Murashige and Skoog's medium supplemented with various combinations of auxin and cytokinin. The most suitable pollen stage of anther culture for the callus induction was 3 days before anthesis at the early to late binucleate stage. Organogenic calli were induced on MS medium supplemented with 5.0 mg/L 2,4-D alone and the combination of 1.0 mg/L 2,4-D and 1.0 mg/L kinetin, however, the combination of NAA and BA was more effective than that of 2,4-D and kinetin on plant regeneration through organogenesis. Shoots were formed from the induced callus on the medium with 0.5 mg/L NAA and 1.0 mg/L BA after 180 days of culture. Multiple shoots with 3-4 leaves, roots, and bulblets were formed on the medium with the combination of 2.0 mg/L NAA and 2.0 mg/L BA after 250 days of culture. The chromosome from root tip of the regenerated plantlet showed the diploid (2n=2x=24). Diploid plants were transferred to the pots and all plants were flowered in two years.

• Journal of Life Science
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• v.16 no.3 s.76
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• pp.459-463
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• 2006

Cultivated garlic, Allium sativum L. is economically important for leaves and bulbs, which historically were used in Korea for spices and condiments of Korean food as well as medicine crops. This experiment was carried out to investigate the effect of development and differentiation on culture of A. sativum (cv: white 6) by explant position, hormone composition and sucrose concentration in culture media. Culture method was investigated to induce shoot primordium. Culture efficiency was better with lower tissue of foliage leaf in explant position and on the medium with NAA 0.02 + BAP 1.0 mg/l in hormone composition than any other. Precocious shoot and callus were induced from shoot apex. Shoot was efficiently differentiated on 4,000 mg/l sucrose with increasing concentration of BAP. Shoot primordium was also induced with liquid rotary culture by histological observation. Rhizoid was induced from callus tissue cluster on medium with NAA 0.02 + BAP 2.0 mg/l.

• Korean Journal of Plant Resources
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• v.16 no.1
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• pp.34-39
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• 2003

Corm apical meristem cultures of thirteen glasshouse freesia cultivars were tested to investigate the possibility of micropropagation using MS basal medium supplemented with 2,4-D, NAA(0.1, 0.5, 1.0mg/L, respectively) and BA (0.5∼2.0mg/L). The majority of the tested cultivars could be induced callus and shoot buds in all culture condition. The combinations of NAA and BA appeared superior to that of 2,4-D and BA depending on cultivars for callus induction and shoot formation. Among the cultivars, 'Golden Yellow' showed the highest regeneration capacity on MS media with 0.5mg/L NAA and 1.0 mg/L BA. The highest percentage of regeneration and the greatest number of shoot from calli were obtained through successive subculture on MS medium supplimented with 0.5mg/L BA. In that condition, more than 60 ％ shoot regeneration and average of 25.1 shoots per explant was achieved. Transformed shoots on half-strength MS medium without plant growth regulators rooted easily.