• Korean Journal of Breeding Science
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• v.41 no.4
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• pp.529-533
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• 2009

A new spray chrysanthemum (Dendranthema grandiflorum) cultivar "Green Witch" was developed from a cross between 'S04161' and 'S04109' by selection of seedlings and lines at the Flower Research Institute, Gyeongnam Agricultural Research and Extension Services (ARES) from 2004 to 2008. Its characteristics were investigated three times from 2006 to 2008 under condition of forcing culture in spring and retarding culture in autumn. The natural flowering time of "Green Witch" was October 19th, and year-round production was possible by day length treatment. Its capitulum was 3.2cm in diameter, and had 15.9 head per stem in autumn. Its ray floret was green central zone. To flower in the short day condition, for "Green Witch" was about 44 days in spring, and "Green Witch" showed the vase life of 25.3 days in autumn. This cultivar was registered for a commercialization in 2008.

• Korean Journal of Plant Resources
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• v.28 no.1
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• pp.111-118
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• 2015

The objective of this study was to determine the response of rapeseed (Brassica napus) to different planting date in the spring and varieties on growth and flowering characteristics. Eight rapeseed varieties were sowed at 10 day interval from 1st to 31th of March at Muan and Jeju in Korea. Significant planting dates and rapeseed varieties effects for growth, start of flowering and duration. As the planting date was being delayed, plant length and flower number were decreased, but branch number was increased. And, start of flowering date was retarded and flowering duration decreased with later planting date. Days from planting to flowering was shortened as seeding date was delayed and shortening degree was similar between experimental locations, Muan and Jeju. The days to flowering for rapeseed about 73~94 days for 1st March and then decreased to 57~71 days for the 31th March of planting date. 'Tammiyuchae' and 'Mokpo 111' seeded on each planting date come into blossom more earlier about 10 days as compared to 'Tamlayuchae' and 'Naehanyuchae'. The duration of flowering for the B. napus varieties was shortened as planting date was delayed. The results revealed that flowering characteristics of rapeseed can be greatly enhanced by planting as early as possible, and early flowering varieties i.e. 'Tammiyuchae' and 'Spring' were the most suitable varieties among the tested varieties for planting in the spring.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.52-52
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• 2020

유채(Brassica napus L.)는 식용유 생산을 목적으로 재배되며, 1975년에는 26.8천ha가 재배되어 연간 생산량이 34.7천톤이 생산되었으나, 외국으로부터 값싼 식용유의 대량수입으로 재배면적이 급격하게 감소되었다. 그러나 최근에 지방자치단체를 중심으로 경관용 재배면적이 증가하고 있고, 건강에 대한 관심이 높아짐에 따라 국내산 non-GM 식용유 생산을 목적으로 유채 재배면적이 급격하게 증가하고 있다. 유채의 대량생산을 위해서는 논 재배가 필수적이나 유채와 벼의 이모작 재배 시기가 겹치는 문제점이 발생하고 있어 조생종 유채의 품종개발과 함께 봄 파종이 가능한 유채의 품종 육성에 대한 요구가 매우 높다. 따라서 본 연구에서는 국내 보유 유채를 포함하는 십자화과(Cruciferae) 유전자원의 특성 평가를 통해 극조숙 유채 품종 육성을 조기에 육성하기 위해 실시하였다. 농촌진흥청 국립유전자원센터에서 분양받은 유전자원 146계통을 파종 재배하면서 핵형분석과 외부형질을 기준으로 정확한 종을 동정하였고, 각 유전자원의 생육 및 개화특성을 조사하였다. 유전자원들을 세포분석기를 이용하여 핵형을 분석한 결과, 전체 146개의 유전자원 중 유채(B. napus L.) 128계통, 갓(B. juncea Sinsk) 6계통, 배추(B. campestris Makino) 9계통, 미분류 3계통 등으로 조사되었다. 유전자원을 가을 파종(10월 22일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 137일 이후인 3월7일부터 개화가 시작되었고, 가장 늦은 계통(IT 279198)은 191일 후인 4월 30일에 개화가 시작되었다. 봄 파종(2월 4일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 79일 이후인 4월 23일부터 개화가 시작되었고 IT 279092 등 29계통은 추대와 개화가 되지 않았다. 위와 같은 연구결과를 토대로 개화시기가 빠른 유전자원을 육종을 위한 인공교배 시화분친이나 종자친으로 이용하면 지방산 품질이 좋고 극조숙성인 유채 품종의 개발이 가능할 것으로 생각된다.

• Journal of Korean Society of Forest Science
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• v.85 no.3
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• pp.532-538
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• 1996

GA4/7 spray, injection and several cultural treatments were applied to the greenhouse-grown potted hybrid larch(Larix decidua${\times}$leptolepis) grafts and field-grown European larch seedlings to induce early flowering. A treatment consisting of repeat-ed GA4/7 sprays, alone, was the most effective flower induction treatment for greenhouse-grown, potted larch grafts. Root pruning as a adjunct treatment did not show synergistic effects. Injection for potted grafts with GA4/7 was not useful approach in this study and it resulted in increased mortality. In the field experiment with 10-Year-old larch seedlings, repeated GA4/7 sprays in combination with root pruning or with plastic mulching appears to be useful and practical means for inducing larch flowers:

• Korean Journal of Plant Resources
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• v.21 no.1
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• pp.47-51
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• 2008

This study was carried out to get the basic data for safflower cultivation according to sowing date by growth analysis for 2 years form 2003 to 2004 at Institute of natural product in Uiseong, G.B.A.R.E.S.. Safflower(Cheongsoo cultivar) was seeded at March 1st, April 1st, May 1st, and July 1st in field. The necessary date for germination was 24 days, when safflower was seeded at March 1st, but it was 8 days which sowed at April 1st and when the seed was sowed at high temperature period, the necessary date for germination was getting short. The necessary date for flowering was the same trend as germination; it took 104 days at March 1st, 79 days at April 1st, 65 days at May 1st, and 58 days at July 1st sowing treatment. The safflower growth was the most vigor when it was sowed at March 1st. T/R(Top/Root) ratio was gently increased during growing season, but when the seed was sowed at July 1 st, it was low compare to sowing at March 1st and April 1st. RGR(Relative growth rate) was the highest during shoot growth stage, but it was rapidly decreased after flowering. CGR(Crop growth rate) was increased at branching stage, and the increasing velocity was slightly decreased just before flowering, and it was increased again at flowering and at this stage, CGR was the highest, and then it did not increased. NAR(Net assimilation rate) was the highest at shoot growth stage during growing season, and was the highest which was sowed at March 1st.

• Journal of Wetlands Research
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• v.22 no.2
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• pp.113-120
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• 2020

For the conservation of both Sericinus montela (vulnerable species by red book of Korea) and A. contorta, we investigated environmental factors affecting the growth and reproduction of Aristolochia contorta. We selected four A. contorta habitats at Gapyeong, Pyeongtaek, Cheongju, and Yeoju in Korea and surveyed community and habitat characteristics of companion species, herbivore appearance, support types, and soil physicochemical properties in July and October, 2018. Habitat environments and the growth and reproduction characteristics of A. contorta were different according to four habitats of different regions. In particular, the fastest growth speed and earliest flowering and fruiting were observed in Pyeongtaek. Growth of A. contorta in Cheongju and Yeoju were interrupted by aboveground damage from human disturbance. In this study, support types seemed to be important for growth speed of A. contorta. Flowering and fruiting timing were likely to be related to combined effects of soil cation contents and competitive and herbivore stresses. Therefore, providing effective support and reducing biological stress should be necessary for stable growth and proper flowering and fruiting timing of A. contorta. In addition, experimental evidence would be needed to figure out the effect of soil cation and biological stress on flowering and fruiting of A. contorta in detail.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.60-60
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• 2020

본 연구는 수확 단계에 따른 작약 주요 품종의 수확후 품질 특성을 조사하여 품종별 적정 수확 시기를 구명하고자 수행하였다. 절화 작약은 '두체스', '레드참', '보울오브크림' 품종을 사용하였으며, 세 품종 모두 1, 2, 3, 4단계로 구분 지어 수확하여 실험에 사용하였다. 수확한 작약은 40cm로 재절단하여 chrysal professional III 용액이 담긴 화병에 꽃아 생체중, 증산량, 수분흡수량, 개화 단계 변화 등을 매일 조사하였고, 이를 통해 수분균형 및 절화 수명 등의 결과를 도출하였다. '두체스' 품종의 품질 특성 변화를 조사한 결과, 1단계에 수확한 절화의 만개소요일수는 5.5일, 만개유지일수는 2.9일, 총 절화수명은 8.4일로 다른 수확단계보다 1~3일 더 긴 것으로 조사되었으며, 생체중증가율 및 화경 변화 결과를 통해 1단계 수확 시에도 개화는 정상적으로 진행되는 것을 확인할 수 있었다. '레드참' 품종의 품질 특성 변화 조사 결과, 1단계에 수확한 절화의 만개소요일수는 7.9일, 만개유지일수는 3.3일, 총 절화수명은 11.2일로 다른 수확단계보다 1~4일 더 긴 것으로 조사되었다. '보울오브크림' 품종의 품질 특성 변화 조사 결과, 1단계 수확한 절화는 30% 수준만 만개하여 조기 수확에 따른 문제점이 확인되었지만, 2단계 수확한 절화는 개화와 만개 모두 100% 진행되었으며, 만개소요일수는 6.4일, 만개유지일수는 4.5일, 총 절화수명은 10.9일로 다른 수확단계보다 1~2일 긴 것으로 조사되었다. 본 연구 결과, '두체스' 와 '레드참' 품종의 적정 수확단계는 1단계, '보울오브크림' 품종의 적정 수확단계는 2단계가 적절할 것으로 판단된다.

• Journal of Bio-Environment Control
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• v.31 no.3
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• pp.230-236
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• 2022

This study was carried out to produce two-flowered seedlings, harvest them early in a greenhouse, and extend the harvest period. This study was carried out to effectively produce the second truss blooming seedlings to harvest tomatoes early and extend the harvest period. For production of the second truss blooming seedlings (one stem), the nutrient solution EC was supplied at 1.5, 2.0, 2.5 dS·m^-1, and dynamic management (3.0 → 3.5 → 4.5 dS·m^-1). The seedling period was 60 days, which was 20-40 days longer than conventional seedlings, and 10 days longer than the first truss blooming seedlings (cube seedlings). The plant height was 78 and 77 cm in EC 2.5 dS·m^-1 and dynamic management respectively, which was shorter than EC 1.5 dS·m^-1 with 88 cm. As for the EC in the cube before formulation, dynamic management had the highest EC 5.5 dS·m^-1, and the cube supplied with EC 1.5 dS·m^-1 had the lowest. The production yield by treatment did not a difference among in the second truss blooming seedlings, but the first truss blooming seedlings showed lower productivity than second truss blooming seedlings. The second truss blooming seedling were harvested 35 days after planting on June 4, the first harvest date, and the first truss blooming were harvested in 42 days on June 11th. There was no difference in plant height and root growth due to bending at frequency planting. In the study on the production of the second truss blooming seedlings (two stem), the nutrient solution EC was supplied under 2.0, 2.5, 3.0 dS·m^-1, and dynamic management (3.0 → 3.5 → 4.5 dS·m^-1). The seedling period was 90 days, which was 40-50 days longer than conventional seedlings and 10 days longer than the first truss blooming seedlings (cube seedlings). Plant height was 80 and 81 cm in EC 2.0 dS·m^-1 and 2.5 dS·m^-1 respectively, but was the shortest at 73 cm in dynamic management. EC in the medium increased as the seeding period increased in all treatments. The dynamic management was the highest with EC 5.1 dS·m^-1. There was no difference in yield among EC treatments in the second truss blooming seedlings, which had a longer seeding period of about 10 days, produced 15% more than the first truss blooming seedlings. In order to shorten the plant height of the second truss blooming seedlings, it is judged that the most efficient method is increasing the concentration of nutrient solution.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.65 no.3
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• pp.241-247
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• 2020

Sesame is typically a temperature- and day length-sensitive plant, as its flowering is promoted under high temperature and shorter day length conditions. The experiment carried out in the present study revealed that day length influenced sesame flowering to a much greater extent than temperature. The degree of day length influence differed depending on the sesame variety. Days from sowing to flowering was negatively correlated with yield-related characteristics such as stem length, capsule number per plant, 1,000 seed weight, and seed weight per 10a. In cases where the period from sowing to flowering was longer and flowering date was later, the reproductive growth period was shorter during maturity. Analysis of the effects of temperature and day length on seed yield production revealed that temperature was a much more influential factor than day length. However, day length was more influential than temperature under low temperatures, such as 22℃. All varieties apart from Ansan were shown to be primarily influenced by temperature. Sesame varieties were grouped in view of optimal seed sowing time through principal components analysis. The Poongsung and Sungboon varieties favored early sowing under low temperatures and short day lengths. The DT45, Poongsung, 90 days, Ansan, and Sungboon varieties favored late sowing under high temperatures and long day lengths. The Yangbaek and Arum varieties could be sown both early and late.

• Journal of Korean Society of Forest Science
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• v.3 no.1
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• pp.36-42
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• 1963

The results obtained are summarized as follows: 1. In both years of 1960 and 1961, the flowering times, fading times of flowers, mature times of fruits of 63 chestnut varieties grown at Choosan area, Chon Nam, have been investigated. Almost the ages of trees were 26-year-old and they are growing on the brown forest soil well drained with relatively thick surface soil. 2. Non-significant difference in flowering time by the varieties has been found between the years. The carliests in floweing time are Toyotama-wase, The isho-wase, Asami-wase, Umehira-wase, i.e., bloomed on May, 22, or a little later. 3. The fading dates of flowers of each varieties almost linearly correlated to the flowering date. The blooming period of each varieties was about 10 to 12 days. 4. Linear correlation between mature time and blooming time are observed, i.e., the earlier the blooming time comes, the earlier is the mature time of chestnut fruit. 5. The varieties having the smallest sized seed, are Otomune and Boji-kuri, however, those having the large one, are Ho-gin, Katayama, Ohara-wase.