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오욱,강경주,조경진,신종화,김기선 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.6
Long-day treatments such as day extension (DE) and night interruption (NI) lighting during short day and cold seasons can promote the growth and flower development of Cyclamen persicum and cyclic NI lighting (CL) can reduce the lighting cost as compared with continuous NI. To compare the effect of CL with continuous NI or DE under different temperatures, cyclamen (Cyclamen persicum Mill.) ‘Metis Red’ was grown until full bloom at 12, 16,or 20°C during dark period in combination with six photoperiods: 9-hour short days (08:00-17:00) with natural sun light (SD), SD + 6-hour DE (17:00-23:00), SD + 2-hour (23:00-01:00) or 4-hour (22:00-02:00) NI, and 10% [6 min on and 54 min off (6/54) for 4-hour] or 20% [6 min on and 24 min off (6/24) for 4-hour] CL. Compact fluorescent lamps used as the light source delivered about 3 μmol·m-2·s-1 PPFD at the canopy level. Plants grown at 20°C during the dark period had visible buds and open flowers earlier by 7 days than those grown at 16 or 12°C. The NI and CL hastened flower bud initiation and flowering, and promoted plant growth as compared with SD at each growing temperature. Plants grown at 16 and 12°C with all NI treatments had the higher numbers of flower buds, leaves, and flowers than those grown at 20°C under SD. Using CL lighting and 16°C could reduce cyclamen production costs during winter by as much as 83% as compared to a natural light and 20°C. Therefore, CL can substitute for continuous NI or heating that enhances the flowering of cyclamen during SD and cold seasons, reducing heating and lighting costs.
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오욱 한국원예학회 2015 원예과학기술지 Vol.33 No.3
Lisianthus (Eustoma grandiflorum) is relatively sensitive to temperature and light conditions. For year round production of good quality potted plants and energy saving, it is necessary to understand the growth and flowering response to the combined conditions of these environmental factors. This study was conducted to examine the growth and flowering responses to temperature, photoperiod, and light intensity during the post-seedling stage. ‘El Paso Deep Blue’ lisianthus plants with four true leaf pairs were grown in growth chambers maintained at average daily temperatures (ADT) of 14, 20, and 26°C and provided with three photosynthetic photon fluxes [PPF; 100, 200, and 400 μmol・m-2・s-1] for 8 (08:00-16:00) and 16 hours (08:00-24:00) by fluorescent and incandescent lamps, resulting in four daily light integrals (DLI): about 3, 6 (two photoperiods), 12 (two photoperiods), and 24 mol・m-2・d-1. After treatment for three weeks followed by growth for one week in a greenhouse of 20 ± 3°C, growth and development were measured. Higher temperature, higher PPF, and longer photoperiod promoted plant growth and flowering; however the impacts of PPF and photoperiod were smaller than those of temperature. As ADT and DLI increased, the number of leaves, number of flowers, lateral shoot length, and shoot dry weight increased. An increase of about 1 mol・m-2・d-1 DLI could constitute an increase of 0.40 to 0.76°C ADT depending on these crop characteristics when ADT and DLI are above 20°C and 12 mol・m-2・d-1, respectively. Therefore, growers can select a regimen of heating or supplemental lighting without delaying harvesting time or decreasing crop quality.
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오욱,김기선 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.3
This study was carried out to investigate the responses of cyclamen to gibberellic acids (GAs) and GAbiosynthesis inhibitors under different temperature and light intensity during different period, and then to examine thechanges in GA level and sensitivity to GA under these environmental conditions. ‘Metis Scarlet Red’ cyclamen plantswith 15 fully unfolded leaves were grown under in three controlled environment chambers maintained at 16/12 (LT),22/18 (MT), 28/24°C (HT) (day/night), respectively. In each chamber, there were growth modules which providedthree photosynthetic photon fluxes (PPFs) [60 (LL), 120 (ML), 240 (HL) μmol·m-2·s-1] at canopy height with 16 hours(08:00-24:00) of photoperiod by fluorescent lamps. Exogenous GA3 and GA4+7 increased petiole length at all PPF andtemperature treatments and the promoting effect was larger under higher PPF irrespective of temperature. But,daminozide and paclobutrazol inhibited petiole elongation rate and inhibition activity increased with decreasing PPF. GA3 nullified the inhibiting effect on petiole elongation by daminozide. However, there were significant differences inthe elongation rate promoted and inhibited by GA3 and daminozide, respectively, between PPFs and temperatures. Promoting effects of GA3 on petiole elongation increased with decreasing PPF and increasing temperature.
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오욱,김기선,Oh, Wook,Kim, Ki-Sun Korean Society of Horticultural Science 2010 원예과학기술지 Vol.28 No.5
낮은 광도는 시클라멘($Cyclamen$ $persicum$ Mill.)의 지상부 신장을 촉진하여 분화의 품질을 떨어뜨리는데, 그 정도는 발육단계와 환경요인에 따라 달라지는 것으로 보인다. 저광도에 대한 엽병의 신장 반응 양상을 알아보기 위해, 유년상(전개엽 5-6매), 전이상(화아 1-3개) 및 성년상(화경 신장 중인 화아 1-3개)의 'Metis Scarlet Red' 시클라멘을 선별하여 명기/암기의 온도가 16/12(저온, LT), 22/18(중온, MT), 28/$24^{\circ}C$ (고온, HT)로 유지되는 대형 생장상의 생장 모듈 내에서 생장시켰다. 생장 모듈은 명기 동안 두 가지 광도조건[60(저광, LL), 240(고광, HL) ${\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD]으로 유지되었다. 실험 I에서는 MT 생장상에서 유년상의 식물체를 LL 또는 HL 모듈에 4주 동안 계속 두거나 처리 1, 2, 3주후 다른 광도의 모듈로 상호 이동시킨 후 신장 반응을 조사하였다. 실험II에서는 MT 생장상에서, 유년상, 전이상, 그리고 성년상의 식물체를 LL 모듈에 넣은 지 0, 3, 6, 9, 12일째에 HL 모듈로 옮기고 21일째에 신장 반응을 조사하였다. 실험 III에서는 LT, MT, HT 생장상에서 전이상의 식물체를 LL 모듈에 넣은 지 0, 3, 6, 9, 12일째에 HL 모듈로 옮기고 21일째에 신장 반응을 조사하였다. LL 노출시간이 0-4주까지 또는 0-12일까지 증가할수록 엽병장과 초장은 모든 온도 조건과 발육단계에서 증가하였다. 4주간 처리된 실험 I에서 후기의 LL 노출이 전기의 노출보다 엽병의 신장속도를 증가시켰다. 실험 II에서, 처리기간 12일 중 초기의 엽병 신장 양상을 보면 전이상 식물체가 유년상이나 성년상보다 LL에 더 민감하게 반응하였다. 실험 III에서, 온도가 증가할수록, 그리고 LL노출시간이 길어질수록 시클라멘의 엽병장은 증가하였다. HT에서의 엽병 신장 속도는 LT와 비교하여 LL처리 초기부터 빠르게 증가하였다. 엽병 신장에 있어서 온도 $6^{\circ}C$ 증가는 3일간 LL 노출과 유사한 효과를 보였다. 결론적으로, 시클라멘은 전이상일 때 고온 하에서 더 즉각적으로 저광도에 반응하여 엽병을 신장시킨다는 것을 알 수 있었다. Reduced irradiance promotes shoot elongation depending on developmental stage and environmental factors and decreases plant quality in $Cyclamen$ $persicum$ Mill. To determine the petiole elongation responses to low irradiance, 'Metis Scarlet Red' cyclamen at different developmental stages [juvenile (5-6 unfolded leaves), transitional (1-3 visible flower buds), or mature (1-3 elongating peduncles)] was grown in growth modules at 60 (low light, LL) or 240 (high light, HL) ${\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD within the growth chambers at different temperatures [16/12 (low temperature, LT), 22/18 (medium temperature, MT), or 28/$24^{\circ}C$ (high temperature, HT) (day/night)]. In Experiment I, juvenile plants were either kept in an LL or HL module during the entire treatment of 4 weeks or were transferred to the other module at 1, 2, or 3 weeks after treatment in an MT chamber. In Experiment II, juvenile, transitional, or mature plants were moved to the HL module at 0, 3, 6, 9, or 12 days after being placed in the LL module at the MT chamber and grown for 21 days. In Experiment III, transitional plants were moved to the HL module at 0, 3, 6, 9, or 12 days after being placed in the LL module at the LT, MT, or HT chambers. As the exposure duration to LL increased from 0 to 4 weeks or from 0 to 12 days, petiole length and plant height increased at all temperatures and developmental stages. In Experiment I, the exposure to LL during the latter period, rather than the early period, increased elongation rate. In Experiment II, petiole elongation in transitional plants was more sensitive to LL than juvenile or mature plants during the early period of the treatment for 12 days. In Experiment III, petiole length increased with increasing temperature and exposure duration to LL. Petiole elongation rate at HT increased rapidly from the beginning of LL exposure as compared to LT. Increase of $6^{\circ}C$ in temperature had the similar effect to LL exposure for 3 days in petiole elongation. To conclude, transitional cyclamen under higher temperatures responds more immediately to low irradiance and elongates its petioles.
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오욱,김동진 한국호텔관광학회 2014 호텔관광연구 Vol.16 No.4
This study was conducted to survey people's recognition, examine the reasons of the misconception, and to correct about botanical names of plants described in Korean playing flowercards(hwatu). In consequence of literature reviews and plant morphology and eco-physiological study, the correct names of plants in hwatu from January to December were as follows: pine, Japanese apricot, Japanese cherry, Japanese wistaria, Japanese iris, tree peony, bush clover, empty mountain(no plant), chrysanthemum, Japanese maple, royal tomentosa, and Babylon weeping willow. As a result of survey, percentages of correct answers about January, February, March, September, and October were high, but those about April, May, June, July, November, and December were low. The reasons why those about April, May, and June were low were because the plant names generally called were not correct as black bush clover, orchid, and rose, respectively. In the cases of July and November, plants were not familiar or correctly named(red bush clover and paulownia tree), and the design of December was called the rain, not its botanical name.
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