• Journal of Plant Biotechnology
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• 제6권4호
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• pp.253-258
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• 2004

Plant regeneration depending on explant type was inves-tigated with cotyledon, hypocotyl, and leaf explants of garland chrysanthemum (Chrysanthemum coronarium L.) cultured on MS basal medium supplemented with various concentrations of SAP and NAA combination. Among the three different types of explants, hypocotyl explants grown on MS medium containing $1.0{\mu}M\;NAA,\;1.0{\mu}M\;BA\;and\;6{\mu}M\;AgNO_3$ produced the highest adventitious shoots (4.67 per explant). Hypocotyl explants not only produced more vigorous shoots, which regenerated aster than the cotyledon and leaf explants. An efficient root formation was observed in MS medium containing $3\%$sucrose. The concentration of NAA did not show significant effects on root formation. Results from this experiment suggested that hypocotyl explants were efficient for the regeneration of garland chrysanthemum.

• Journal of Plant Biotechnology
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• 제36권2호
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• pp.137-143
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• 2009

An efficient system for high frequency plant regeneration was established through investigating various factors such as plant growth regulator combinations, explant types and ages, and addition of $AgNO_3$ influenced on shoot regeneration in Brassica juncea L. cv. BARI sarisha-10. Murashige and Skoog (MS) medium supplemented with 0.1 mg/L NAA (1-naphthaleneacetic acid) and 1 mg/L BA (6-benzyladenine) showed the maximum shoot regeneration frequency (56.67%) among the different combinations of NAA and BA. Explant type, explant age, and addition of $AgNO_3$ also significantly affected shoot regeneration. Of the four type of explants (cotyledon, hypocotyl, root, and leaf explants)- cotyledon explants produced the highest shoot regeneration frequency and hypocotyls explants produced the highest number of shoots per explant, whereas root explants did not produce any shoot. The cotyledonary explants from Four-day-old seedlings showed the maximum shoot regeneration frequency and number of shoots per explant. Shoot regeneration frequency increased significantly by adding $AgNO_3$ to the medium. Two mg/L $AgNO_3$ appeared to be the best for shoot regeneration with the highest shoot regeneration frequency (86.67%) and number of shoots per explant (7.5 shoots). Considerable variation in shoot regeneration from cotyledonay explants was observed within the B. juncea L. genotypes. The shoot regeneration frequency ranged from 47.78% for cv. Shambol to 91.11% for cv. Rai-5. In terms of the number of shoots produced per explant, B. juncea L. cv. Daulot showed the maximum efficiency. MS medium supplemented with 0.1 mg/L NAA showed the highest frequency of rooting. The regenerated plantlets were transferred to pot soil and grown to maturity in the greenhouse. All plants were fertile and morphologically identical with the source plants.

• Journal of Plant Biotechnology
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• 제40권2호
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• pp.72-78
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• 2013

본 연구는 갓(Brassica juncea L. Czern)의 효율적 재분화조건 확립을 위해 재분화가 잘되는 절편체 종류와 절편체의 나이 그리고 재분화율 향상에 관여하는 사이토키닌 종류와 적정 함량을 조사하였다. 절편체 종류에 따른 갓의 재분화율은 다음과 같았다: 잎자루 달린 자엽> 하배축> 잎자루 달린 본엽> 자엽> 본엽. 또한 파종 후 5일된 잎자루 달린 자엽에서의 재분화능이 가장 양호하였다. 6종의 사이토키닌 중에서- 6-${\gamma}$-${\gamma}$-Dimethylallylamino-purine (2-ip), 6-${\gamma}$-${\gamma}$-Dimethylallylamino-purine riboside (2-ip riboside), 6-Benzyl amino-purine (BAP), Thidiazuron (TDZ), Zeatin, Zeatin riboside-TDZ $8{\mu}M$ 처리구에서 재분화율이 평균 80%로 가장 높은 것을 알 수 있었다. 이렇게 획득한 재분화 식물체는 온실로 옮겨져 재배되었으며, 정상적인 생육과정을 거쳐 개화가 이루어지는 것이 관찰되었다.

• Journal of Plant Biotechnology
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• 제3권1호
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• pp.19-25
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• 2001

Induction of somatic embryogenesis from Brazilian eggplant variety F-100 was studied in response to four auxin types. NAA, at the optimal concentration of 54 $\mu\textrm{m}$, was the only one that resulted in the induction of somatic embryos in either leaf and cotyledon explant and, at murk lower intensity and frequency, in hypocotyl and epicotyl explants. The optimal temperatures for embryo induction were 28 and 35$^{\circ}C$ for cotyledon and leaf explants. Incubation at 22$^{\circ}C$ caused a significant reduction both in the frequency and intensity of induction. This system was used to study the effects of position and orientation of the tissue on the culture medium as well as of antibiotics and explant co-cultivation with Agrobacterium on the efficiency of somatic embryo induction. The intensity of embryo induction was greater in the midsections of cotyledons relative to apical and basal regions, when the abaxial surface was in contact with the culture medium. The presence of antibiotics resulted in approximately 40-60% reduction of embryo induction relative to control explants, which originated 335$\pm$26.6 embryos. Co-cultivation with Agrobacterium before treatment with antibiotics caused a more drastic reduction (80-99%). Ampicilin treatment after cocultivalion with Agrobacterium caused the least inhibitory effect, allowing the production of 60 embryos/explant.

• Journal of Plant Biotechnology
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• 제44권1호
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• pp.42-48
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• 2017

본 연구는 윤판나물의 효과적인 기내 증식을 위한 배양 최적 조건을 구명하기 위해 수행되었다. 신초 유도 및 생장에 영향하는 배지(MS, B5 및 WPM) 및 절편체 종류에 따른 실험에서 줄기 유도는 액아 절편을 식물생장조절물질 무첨가 MS 배지에 배양 시 절편 당 2.5개로 가장 좋았고, 줄기 신장은 정아 절편을 식물생장조절물질 무첨가 MS 배지 배양 시 7.2 cm로 가장 효과적이었다. BA 침지 처리 시 신초 유도 효과는 액아배양 유래 신초를 BA 침지 무처리구에서 신초 유도(2.29개/절편) 및 신초 신장(7.28 cm)이 가장 효과적이었으며, BA 침지 시간이 길어짐에 따라 신초 유도 및 길이 생장은 감소하였다. 발근에 영향하는 IBA 농도 효과는 정아유래 신초를 1.0 mg/L 처리구에서 배양 시 최대 발근율(100%) 및 뿌리 유도수(21.3개/절편)를 보였으며, 정아 혹은 액아 유래 신초지 종류에 따른 발근율의 차이는 크지 않은 것으로 관찰되었다. 발근된 식물체는 상토로 이식하여 형태적인 변이 없이 정상적인 생장을 보였다.

• Journal of Plant Biotechnology
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• 제41권2호
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• pp.94-99
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• 2014

희귀 멸종위기 식물인 미선나무를 재료로 기내 증식 및 발근에 미치는 광질 및 절편체(정아지 및 액아지) 효과를 조사하였다. 광질은 냉백색 형광등(F), 100% 청색광 LED(B), 혼합광(BR; 50% blue LED+50% red LED) 및 100% 적색광(R)을 사용하였다. 줄기의 증식은 절편체 종류에 따른 뚜렷한 차이를 보이지 않았으나 광질에 따른 차이를 보였다. 전반적으로 줄기의 증식은 청색광 및 혼합광에서 촉진되는 것으로 나타났으며, 특히 청색광에서는 일부 절편에서 발근이 이루어 졌다. 줄기의 생장 역시 광질에 따른 현저한 차이가 없었다. 적색광에서 줄기 신장이 촉진된 반면 잎의 발달은 저조하였다. 발근은 전반적으로 광질에 관계없이 정아지가 액아지보다 양호하였고, 뿌리수도 증가하였으나 혼합광에서는 발근이 억제되었다. 한편 적색광에서는 뿌리의 발달이 매우 부진하여 다른 광질과 유의적인 차이를 보였다. 발근유도 시 줄기는 주로 단일 줄기로 자랐다. 이상의 결과를 볼 때 LED를 이용한 미선나무의 기내번식은 정아지를 절편으로 청색광 및 혼합광 LED (BR) 하에서 배양함이 좋은 것으로 나타났다.

• Journal of Plant Biotechnology
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• 제35권2호
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• pp.163-167
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• 2008

Adventitious buds appeared within 2 weeks on the base of the petiole explants and increased for two months. A maximum of regeneration (15.6%) was obtained on the medium containing $1.5\;{\mu}M$ TDZ in combination with $1\;{\mu}M$ IBA. To know which explants are the best for the induction of regeneration, three explants such as leaf, petiole and leaf-petiole were used. Among the explant types, the leaf-petiole explant was significantly more effective than leaf and petiole for promoting adventitious shoots, with leaf-petiole inducing at the highest regeneration frequency (33.7%). The regeneration frequency of adventitious shoots in the leaf-petiole explants was significantly affected by leaf size and the position of explants. The leaf-petiole smaller than 5 mm leaf in width was induced at the highest regeneration frequency (68.9%). The smaller leaf sizes, the greater regeneration frequency. Also when the leaves are nearer to the shoot tip, the regeneration frequency is higher. When the rooted micro-shoots were transferred to the soil after growing for 6 weeks in the media, the survival rate was 90%.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2003년도 제10차 국제학술회의 및 추계정기 학술발표회
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• pp.2-3
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• 2003

A method for rapid propagation of mature Jack fruit was developed. Four types of explants (mature embryos, apical meristems of young seedlings, apices from mature plants and nodal segments) were used. It has been found 88% of young apical meristems produced shoots in Campbell and Durzan (CD) medium compared to 60% in Murashige and Skoog (MS) medium. Only 1/3 of them produced multiple shoots. Shoot initiation from nodal segments was very rare. Mature apices produced callus. Although removal of the sheathing cover around mature buds enhanced the shoot initiation but success rate was low in growth regulator free medium. Embryos respond to the CD medium but not to the MS medium. Embryos from seeds soaked in water for 24 hours produced shoots after 8 weeks of incubation and the success rate was 70% while embryos from dry seeds only produced roots. There was no significant effect of cold storage (refrigeration) for 7 days on shoot initiation from mature embryos (65%) but the ability for shoot induction declines with storage time (55% after 21 days of cold storage). Mature axillary buds were established in Modified Campbell and Durzan (CD) medium supplemented with 0.5mg/1 and IBA. There was a significant difference in the growth performance of shoots according to the period of the year in which explants were collected. Highest (60%) was observed in November-January period. It was only 30% when the explants were collected in February-April or May-July and decreased to 20% in August-October. The shoots produced in November-January showed a higher vigor than those produced in other months. Since Jak fruit show seasonal changes in fruit bearing and shedding of leaves, it can be suggested that the difference in growth performances of tissues cultured in artificial culture media would have been affected by endogenous rhythms.

• 한국자원식물학회지
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• 제19권4호
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• pp.524-529
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• 2006

자귀나무의 대량증식을 위한 신초 형성 및 뿌리 유도를 위해 시토키닌과 옥신이 함유된 배지에 배양하였다. 전체적인 신초 유도율은 평균 56.2%였으며, 그 중 가장 높은 유도율을 보인 것은 73%의 zeatin으로 신초 형성에 효과적인 것으로 나타났을 뿐 아니라 TDZ와 혼용 처리했을 때에도 뛰어났다. 특히, zeatin 1.0mg/L를 처리한 하배축에서 대량의 줄기가 형성되었으며, 혼용처리의 경우 zeatin 2.0 + TDZ 0.05mg/L의 뿌리 절편에서 효과적으로 나타났다. 증식된 식물체의 뿌리 유도는 식물생장조절물질 처리보다는 무처리 배지에서 활발한 것으로 나타났다. 본 연구는 기내 조직배양을 통해 자귀나무 식물체에서 신초를 대량으로 형성시켰고, 증식된 신초에서 다시 뿌리를 유도함으로써 온실에서 경화시킬 수 있었다. 이로써 약용수종인 자귀나무의 대량 증식이 가능한 토대를 마련하였고, 약용수목자원에 대하여 조직배양을 이용하여 기내에서 장기적으로 보존할 수 있는 기반을 마련하는데 의의가 있다고 할 수 있다.

• 한국약용작물학회지
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• 제20권6호
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• pp.479-486
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• 2012

The production of adventitious roots derived from root explant of Echinacea angustifolia and its secondary metabolite content were assessed in different types and levels of auxin. The induction of adventitious roots from root explant cultured in Murashige and Skoog solid medium supplemented with 1.0 mg/L indole -3-butyric acid (IBA) attained highest as 20.87 mg fresh weight and 3.07 mg dry weight per culture but root suspension culture at the same concentration of IBA enhanced biomass production as 3.07 g fresh weight and 0.38 g per culture after 4 weeks in culture. 3.0 mg/L ${\alpha}$-naphthalene acetic acid (NAA) treatment had similar effect on root biomass production as 3.07 g fresh weight and 0.38 g per culture with liquid suspension culture, whereas adventitious roots exposed to over 3.0-5.0 mg/L IBA or 5.0 mg/L NAA were less responsive by reducing the number of adventitious roots and/or changing root morphology such as short and thick. The content of secondary metabolites such as phenolic, flavonoids and total caffeic acid in adventitious roots cultured on MS medium supplemented with 1.0 mg/L IBA were attained highest as 27.20, 9.60. 10.67 mg/g dry weight, respectively. Overall, the best production of root biomass and secondary metabolites were given by 1.0 mg/L IBA.