• Title/Summary/Keyword: shade treatment

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Effect of Soil Water and Shading Treatment on Chlorophyll Fluorescence Parameters and Photosynthetic Capacity in Cnidium officinale Makino (토양 수분 스트레스와 차광 처리가 천궁의 엽록소 형광반응 및 광합성에 미치는 영향)

  • Kim, Kwang Seop;Seo, Young Jin;Kim, Dong Chun;Nam, Hyo Hoon;Lee, Bu Yong;Kim, Jun hyung
    • Korean Journal of Medicinal Crop Science
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    • v.28 no.6
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    • pp.412-420
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    • 2020
  • Background: Measurement of chlorophyll fluorescence (CF) is useful for detection the ability of plants to tolerate environmental stresses such as drought, and excessive sunlight. Cnidium officinale Makino is highly sensitive to water stress and excessive sunlight. In this study, we evaluated the effect of soil water and shade treatment on the photosynthesis and leaf temperature change of C. officinale. Methods and Results: C. officinale was cultivated under uniform irrigation for 1 week drought stress (no watering) for 6 days. A significant decrease in CF was observed on the 5th day of withholding water (approximately 6% of soil water content) regardless of shading. Notably, the Rfd_lss parameter (CF decrease rates) with and without shade treatment was reduced by 73.1% and 56.5% respectively, at 6 days compared with those at the initial stage (0 day). The patterns of the degree of CF parameters corresponded to those of the soil water content and difference between leaf temperature (Ts) and air temperature (Ta). Meanwhile, CF parameters recovered to the 3 - 4 days levels after re-watering, while the soil water potential was completely restored. The suitable soil water content for C. officinale optimal growth was between -5 kPa and -10 kPa in this experiment. Conclusions: Lack of soil water in the cultivation of C. officinale, even with shading, decreased latent heat cooling through transpiration. As a result, heat dissipation declined, and the plant was subjected to drought stress. Soil water content plays a major role in photosynthesis and leaf temperature in C. officinale.

Effects of shading on the growth of variegated liriope (Liriope platyphylla Wang et Tang. forma variegata Hort) (차광이 반입맥문동(Liriope platyphylla Wang et Tang. forma variegata Hort.)의 생육에 미치는 영향)

  • 최상태;김지은;박인환;안형근;김성태
    • Asian Journal of Turfgrass Science
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    • v.15 no.2
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    • pp.77-86
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    • 2001
  • The experiments were carried out to investigate effect of shading rare on variegata appearance and leaf growth of variegated liriope (Liriope platyphylla Wang et Tang variegata Hort.) The plant was grown under four different light intensities such as 0(natural light intensity), 25, 50 and 75% shading conditions. Leaf variegata appearance was better in the light than in the shade. Leaf showed good growth at 0, 25% shading treatment, average leaf width and area of yellow part were highest at 0% shading treatment. As increased shading rate, number of stomate per unit area decreased. Total chlorophyll of the whole leaf and green part were reduced by increasing shading rate, while yellow part showed oppositely. In the epidermis, cell size of 75% shading treatment showed larger than those of 0% shading treatment.

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A Study on the Wild Exochorda serratifolia for Landscape Horticuitural Cultivation (야생 가침박탈(Exochorda serratifolia)의 조경원예화에 관한 연구)

  • 이기선;한교필;박원조;김일섭
    • Journal of the Korean Institute of Landscape Architecture
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    • v.15 no.2
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    • pp.139-148
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    • 1987
  • Exochorda serratifolia, broad-leaved shrub has beautiful flowers and is resistant to cold, shade and decease. New this native plant is considered to be worth being exploited as the outstanding plant for landscaping and horticulture. So this study was executed to utilize Exochorda serratifolia as the planting material for landscaping and horticulture through the survey of its habitat environment and the experimennt of its seed physiology and germination, vegetative propagation, culture and utilization, etc.. The results are as follows ; 1. The color of the flower is white, blooming in the early and middle of May and the seeds ripen late in Sep.. 2. The elevation, elevation, gradient and direction of the native habitat were 250m, 20-25$^{\circ}$and northern side respectively. 3. The soil pH of the natural habitat was 5.3 and soil fertility was poor. 4. Exochorda serratifolia appeared as indicator within P. densiflora community and its neighboring species were Q. mongolica, Q. dentata, R. mucronulatum, L. obtusiloba, E. oxyphillus, C. heterolphylla, var thunbergii, etc.. 5. The optimum temperature for seed germination was found at 20$^{\circ}C$ and the longer the stratification period at 5$^{\circ}C$ was, the lower the germination rate was. 6. The treat merits of GA and Kinetin increased the seed germination rate, especially under the dark condition but their high concentrations decreased the seed germination rate. 7. The rooted rate of the greenwood cutting was the highest at IBA 100ppm plot of vermiculite bed but its high concentration decreased the rooted rate conspicuously. 8. In the tissue culture, the each 1.0 ppd plot of NAA, Kinetin and NAA 1.0ppm + Kinetin showed the best growth. And the mixture of NAA 1.0ppm and Kinetin showed better growth than the single treatment of NAA or Kinetin did. 9. Transplanted Exochorda serratifolia showed healthy growth with shaded environmental condition(42.1% light intensity), therefore they can be cultivated as a shade tolerant landscape plant. 10. It was considered that Exochorda serratifolia was applicable to group planting at shade places or under trees in parks, homes, etc..

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Effects of seed sources and shade on vigor of Brant's oak seedling

  • Taghvaei, Mansour
    • Journal of Ecology and Environment
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    • v.33 no.4
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    • pp.299-306
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    • 2010
  • The use of local seed provenance is often recommended in forest restoration. Early vigor is a combination of the performance of seed germination and emergence after planting. The ability of young Brant's oak plants to grow and develop after emergence and its dependence on local habitat conditions was investigated in this study. The effects of seed source and shade on early growing seedlings of Brant's oak (Quercus brantii L.) were determined in field measurements. Seeds of Quercus brantii L. were collected from 4 forest areas (seed sources) in southern Zagros (Provinces of Kohkilouyeh-Bouyer Ahmad and Fars) at altitudes of 850, 1,100, 1,500, 2,100 m a.s.l., and planted in a nursery constructed in southwestern Iran. According to a split-plot design consisting of four blocks, each containing two main treatment plots (no shading, partial shading), each main plot was sub-divided into four sub-plots (for elevations of 850, 1,100, 1,500 and 2,100 m). Results showed that shade treatments had significant effects on emergence percentage and rate, shoot length, shoot dry weight (SDW), root dry weight (RDW), leaf area (LA), and chlorophyll content. Ecological factors also had an effect on seed performance. Altitude of seed source had a very significant effect on root length, LA, SDW, and RDW. The seeds collected from 850 m a.s.l. elevation showed the highest performance, especially in leaf area, root length, shoot dry weight, and root dry weight. Our results showed that the altitude of 850 m a.s.l. was the best for collecting Brant's oak seeds.

The Effect of Chitosan and Tannin Treatment on the Natural Dyeing using Loess (키토산과 탄닌 처리가 황토 염색에 미치는 영향)

  • Kwon, Min-Soo;Jeon, Dong-Won;Choe, Eun-Kyung
    • Textile Coloration and Finishing
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    • v.18 no.4
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    • pp.1-10
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    • 2006
  • Tannin treatment has been used for improving the color fastness of dyed materials. In natural dyeing, the tannin treatment is highly effective in improving the fastness. The chitosan treatment also improves the fastness and depth of shade in natural dyeing. In this study, the effects of tannin and chitosan pre-treatment on the color and fastness in loess dyeing were investigated. Cotton woven fabric specimens and cotton knit fabric specimens were pre-treated with chitosan solution in acetic acid, and the specimens were then treated with or without tannin. The specimens were finally dyed with loess. The tannin treatment decreased the K/S values, while the chitosan treatment increased the K/S. Both the tannin treatment and the chitosan treatment increased the wash fastness and light fastness. In tannin treatment, tannin component and Fe component of loess may react together to decrease the lightness and develop dark color. For maintaining inherent color of the loess, it is much preferable to employ chitosan treatment rather than tannin treatment.

Clinical assessment of whitening efficacy and safety of in-office tooth whitening system containing 15% hydrogen peroxide with or without light activation (15% 과산화수소 함유 전문가용 치아 미백제의 광활성화 여부에 따른 미백효과 및 안전성에 관한 임상평가)

  • Noh, Young-Suk;Rho, Young-Jee;Yoo, Yeon-Jee;Lee, Hyang-Ok;Lim, Sang-Min;Kweon, Hyun-Jeong;Kim, Ye-Un;Park, Seong-Yeon;Yoon, Hee-Young;Lee, Jung-Hyun;Lee, Chan-Hee;Oh, So-Ram;Kum, Kee-Yeon
    • Restorative Dentistry and Endodontics
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    • v.36 no.4
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    • pp.306-312
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    • 2011
  • Objectives: This clinical study evaluated the effect of light activation on the whitening efficacy and safety of in-office bleaching system containing 15% hydrogen peroxide gel. Materials and Methods: Thirty-three volunteers were randomly treated with (n = 17, experimental group) or without light activation (n = 16, control group), using Zoom2 white gel (15% $H_2O_2$, Discus Dental) for a total treatment time of 45 min. Visual and instrumental color measurements were obtained using Vitapan Classical shade guide and Shadepilot (DeguDent) at screening test, after bleaching, and 1 month and 3 month after bleaching. Data were analyzed using t-test, repeated measure ANOVA, and chi-squared test. Results: Zoom2 white gel produced significant shade changes in both experimental and control group when pre-treatment shade was compared with that after bleaching. However, shade difference between two groups was not statistically significant (p > 0.05). Tooth shade relapse was not detected at 3 months after bleaching. The incidence of transient tooth sensitivity was 39.4%, with being no differences between two groups. Conclusions: The application of light activation with Zoom2 white gel system neither achieved additional whitening effects nor showed more detrimental influences.

모발(毛髮)의 Carotinoid계(係) 색소(色素) 염색(染色)에서 Chitosan 처리순서(處理順序)가 모발(毛髮)의 염색성(染色性)과 역학적(力學的) 특성(特性)에 미치는 영향(影響)

  • Kim, Kyung-Sun;Jeon, Dong-Won;Kim, Jong-Jun;Ahn, Byung-Tae
    • Journal of Fashion Business
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    • v.11 no.5
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    • pp.79-89
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    • 2007
  • The effect of chitosan treatment on the dyeing and dye fastness, and mechanical properties of hair was investigated in this study when the carotinoid dyestuffs extracted from African Marigold(Tagetes erecta L.) were applied to the hair. The sequences of the chitosan treatment were changed in dyeing and mordanting procedures, i.e., pre-treatment, mid-treatment, and post-treatment. While the effect of chitosan application on the color shade change was not significant, the pre-treatment of the chitosan increased the dye uptake. Discoloration and fading was observed in the lightfastness test when chitosan was mid-treated. Alkali perspiration and acid perspiration fastness test results showed that chitosan post-treatment gave lower tendency. Washing fastness results showed that chitosan post-treatment and mid-treatment gave lower values, which indicates that chitosan deters the direct formation of insoluble complex among fiber-dyestuff-mordant. In the mechanical characteristics results, however, initial modulus and breaking strength increased significantly in the post-treatment and pre-treatment of chitosan.

Effect of Seed Density, Number of Seeds Sown Per Hole and Thinning Treatment on Growth Characteristics and Disease Occurrence in Greenhouse-Cultivated Ginseng (인삼 하우스 직파재배시 파종밀도, 혈당 파종립수, 솎음처리가 생육과 병 발생에 미치는 영향)

  • Mo, Hwang Sung;Park, Hong Woo;Jang, In Bae;Yu, Jin;Park, Kee Choon;Hyun, Dong Yun;Kim, Ki Hong;Seo, Tae Cheol
    • Korean Journal of Medicinal Crop Science
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    • v.23 no.3
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    • pp.198-206
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    • 2015
  • This study was conducted to investigate the effects of sowing density, number of seeds sown per hole, and thinning treatment on growth characteristics and disease occurrence in Panax ginseng under direct sowing cultivation in a blue plastic greenhouse. Seedling were grown from 2 or 3 seeds sown, and the healthiest was only retained, while the rest were thinned out at the foliation stage. $NO_3$-N, $P_2O_5$, and organic matter content differed significantly between growth conditions in the plastic greenhouse and in conventional shade in the soil. Disease also tended to be higher in the conventional shade than in the plastic greenhouse. Plant height and stem length showed an increasing trend with increasing sowing density and number of seeds sown per hole. However, these measures noticeably decreased when thinning treatment was conducted. Growth of the subterranean part of ginseng was not markedly influenced by sowing density, the number of seeds sown per hole, or thinning treatment. Root weight, which is an important factor in yield, was significantly affected by the number of seeds sown and thinning treatment. Interestingly, root weight tended to be higher in the thinning treatment plot than the untreated control plot. Damping-off and root rot increased noticeably as the number of seeds sown increased. Disease also tended to be substantially higher in the thinning treatment plot than the untreated control. However, physiological disorder of the plants did not vary with sowing density, the number of seeds sown, or thinning treatment.

Effects of Color Depth on Wool and Silk Fabrics Treated Sputter Etching (Sputter etching에 의한 양모, 견직물의 농색효과)

  • Cho, Hwan;Gu, Kang
    • Textile Coloration and Finishing
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    • v.6 no.3
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    • pp.44-51
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    • 1994
  • Wool and silk fabrics dyed with C.l. Acid Black 155 were subjected to sputter etching and exposed to a low temperature argon plasma. Color depth of shade of the fabrics increased considerably, but sputter etching was more effectively than argon low temperature plasma treatment. And measured for any significant chemical modification by ESCA (XPS). Sputter etching and argon low temperature plasma treatments incorporated oxygen atoms into the surface.

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