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Yong Ha Rhie,Wook Oh,Ji Hum Park,Changhoo Chun,Ki Sun Kim 한국원예학회 2006 Horticulture, Environment, and Biotechnology Vol.47 No.4
Heating during winter is unavoidable in greenhouse production of spring flowering potted cyclamen. Long-day (LD) treatment to promote the flowering of many LD plants is considered as alternative methods to heating. This research was conducted to determine the flowering response to temperature and photoperiod according to growth stages [stage Ⅰ, flower bud initiation (from 5-unfolded leaves to 2 ㎜ visible bud (VB); stage Ⅱ, flower bud development (for 9 weeks after VB)]. ‘’Metis Purple’ cyclamen seedlings during stage Ⅰ or Ⅱ were grown under growth chambers maintained at 8, 12, 16, and 20℃ in combination with LD (16 h) or short-days (SD, 8 h). After treatments, all plants were transferred to a growth chamber maintained at 22/16℃ (day/night). In stage Ⅰ, VB initiation was hastened by 8 to 13 days in plants grown at 16 and 20℃ compared to those grown at 12℃. LD hastened the emergence of VB by 8 days at 20℃ and 6 days at 16℃. VB was not observed under either LD or SD at 8℃, and 8h at 12℃. During stage Ⅱ, high temperature and LD hastened flowering. There was no difference in flowering between 8 h-20℃ and 16 h-16℃, and also no difference between 8 h-16℃ and 16 h-12℃, indicating that day-extension lighting could substitute for expensive heating. The information is useful in low energy cost production without flowering delay in winter.
Substrate Water Content Influences the Flowering of Doritaenopsis Queen Beer ‘Mantefon’
Rhie, Yong Ha,Kang, Seonghwan,Kim, Jongyun American Society for Horticultural Science 2017 HortScience Vol.52 No.12
<P>Automated irrigation systems based on soil moisture sensor measurements can reduce water and fertilizer use while adequately meeting plant water requirements. In this study, the effects of substrate volumetric water content (θ, v/v) on the flowering of 17-month-old <I>Doritaenopsis</I> Queen Beer ‘Mantefon’ (from the time of deflasking) were examined. The plants were transplanted in plastic pots (10.5 cm width × 9.5 cm height) filled with sphagnum moss and the θ of sphagnum moss was maintained at 0.2, 0.3, 0.4, or 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP> using an automated drip irrigation system. Plants grown at a θ threshold of 0.2 m<SUP>3</SUP>·m<SUP>−3</SUP> had thinner leaves and lower SPAD value than those grown at higher θ thresholds. The net CO2 uptake of the uppermost fully expanded leaf increased with increasing θ between 0.2 and 0.4 m<SUP>3</SUP>·m<SUP>−3</SUP>, but there was no significant difference in the net CO2 uptake between plants grown at 0.4 and 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP> thresholds. The number of flower buds at the time of the first open flower was lower in plants grown at θ thresholds of 0.2 and 0.3 m<SUP>3</SUP>·m<SUP>−3</SUP> as compared with that in the plants grown at 0.4 and 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP> thresholds. Early flower abscission, flower bud dropping, and flower senescence during the 2 weeks after flowering occurred in 55% and 30% of the plants at 0.2 and 0.3 m<SUP>3</SUP>·m<SUP>−3</SUP> thresholds, respectively, whereas plants at θ thresholds of 0.4 and 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP> had negligible flower abscission. Although vegetative growth parameters were similar among θ thresholds of 0.3 m<SUP>3</SUP>·m<SUP>−3</SUP> or higher, plants grown at a θ threshold of 0.3 m<SUP>3</SUP>·m<SUP>−3</SUP> produced fewer flowers than those grown at 0.4 and 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP> thresholds. During the 83-day experimental period, the system irrigated the plants ≈0.79, 1.93, 2.46, and 2.84 L/pot at θ thresholds of 0.2, 0.3, 0.4, and 0.5 m<SUP>3</SUP>·m<SUP>−3</SUP>, respectively. Overall, 0.4 m<SUP>3</SUP>·m<SUP>−3</SUP> was considered to be an optimal threshold θ level for producing high-quality <I>Doritaenopsis</I> Queen Beer ‘Mantefon’ during the flowering period with most efficient water use.</P>
Light Intensity Influences Photosynthesis and Crop Characteristics of Jeffersonia dubia
Rhie, Yong Ha,Lee, Seung Youn,Jung, Hyun Hwan,Kim, Ki Sun Korean Society of Horticultural Science 2014 원예과학기술지 Vol.32 No.5
Jeffersonia dubia is a spring-flowering perennial found in rich forests in Korea and Northern China and has potential as an ornamental or medicinal plant. However, illegal picking and land use change have decreased the number of populations and overall population size of this plant in its natural habitat. Although J. dubia has been reported to be a shade-preferring plant, no study has determined the optimum light intensity for its growth. The objectives of this work were to observe the effects of various shading levels on the physiological responses of J. dubia and to determine the proper shading level for cultivation. Treatments consisted of four shading levels (0%, 50%, 75%, and 95% shade) imposed using black mesh cloth. The number of leaves and dry weight increased with decreased shading. The shoot-to-root ratio increased with increased shading, mainly due to decreased root dry weight under shading. Plants showed low net $CO_2$ assimilation rates and $F_v/F_m$ values combined with low dry matter levels when grown under 0% shade (full sunlight). These results indicate that J. dubia plants experience excessive irradiance without shading, resulting in damage to the photosynthetic apparatus. By contrast, the net photosynthesis rate increased as the shading level increased. $F_v/F_m$, the potential efficiency of PSII, was 0.8 under 95% shade, indicating that J. dubia is well-adapted under heavy shading. However, the low dry matter of plants in the 95% shade treatment indicated that the low light intensity under 95% shade led to a decline in plant growth. Thus, moderate light (50% shading) is recommended for cultivating J. dubia without physiological defects.