• Title/Summary/Keyword: Yearly variation

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Effects of Several Factors on Embryogenesis in Anther Culture of Broccoli(Brassica oleracea L. var. italica Plenck.) (녹색꽃양배추(Broccoli)의 葯培養에 있어서 배발생에 미치는 몇가지 要因分析)

  • 이광식;박재복;안춘희;윤여중
    • Korean Journal of Plant Tissue Culture
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    • v.25 no.4
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    • pp.251-256
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    • 1998
  • The effect of several factors on efficiency of anther culture of broccoli was studied. The medium supplemented with 14% sucrose, 125mg/L of silver nitrate and 0.1mg/L of each of NAA and 2,4-D was best in embryogenesis in all varieties tested. The effect of auxin was affected by silver nitrate, that is, it lowered embryogenesis when the concentration of NAA and 2,4-D was low, but it enhanced when their concentrations were high. Benzyl aminopurine increased embryogenesis in some varieties, but decreased in others. Although microspore embryogenesis was observed in anthers of which heigest was 1 to 0.6 - 1.0 of petal heigest in the bud, which corresponds to the early uninucleate to early binucleate stage of the microspores, it was much better when the ratio of heigest was 1 : 0.8. More embryos ware inducted from culture in March than in February in general. Because there was a big yearly variation, it was assumed that microspore embryogenesis was influenced greatly by the culture condition and the physiological condition of donor plants.

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Analysis of climate change impact on flow duration characteristics in the Mekong River (기후변화에 따른 메콩강 유역의 미래 유황변화 분석)

  • Lee, Daeeop;Lee, Giha;Song, Bonggeun;Lee, Seungsoo
    • Journal of Korea Water Resources Association
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    • v.52 no.1
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    • pp.71-82
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    • 2019
  • The purpose of this study is to analyze the Mekong River streamflow alteration due to climate change. The future climate change scenarios were produced by bias corrections of the data from East Asia RCP 4.5 and 8.5 scenarios, given by HadGEM3-RA. Then, SWAT model was used for discharge simulation of the Kratie, the main point of the Mekong River (watershed area: $646,000km^2$, 88% of the annual average flow rate of the Mekong River). As a result of the climate change analysis, the annual precipitation of the Kratie upper-watershed increase in both scenarios compared to the baseline yearly average precipitation. The monthly precipitation increase is relatively large from June to November. In particular, precipitation fluctuated greatly in the RCP 8.5 rather than RCP 4.5. Monthly average maximum and minimum temperature are predicted to be increased in both scenarios. As well as precipitation, the temperature increase in RCP 8.5 scenarios was found to be more significant than RCP 4.5. In addition, as a result of the duration curve comparison, the streamflow variation will become larger in low and high flow rate and the drought will be further intensified in the future.

Evaluation of Removal Efficiency of Pollutants in Constructed Wetlands for Controlling Nonpoint Sources in the Daechung Reservoir Watershed (대청호 유역 비점오염원 제어를 위한 생태습지의 오염물질 제거효율 평가)

  • Pyeol-Nim Park;Young-Cheol Cho
    • Korean Journal of Ecology and Environment
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    • v.56 no.2
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    • pp.127-139
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    • 2023
  • Daechung Reservoir has been suffering from severe cyanobacterial blooming periodically due to the water pollutants from the watershed, especially nutrients from nonpoint sources. As a countermeasure, an artificial wetland was constructed to mitigate the pollutant load from the watershed by utilizing the vegetation. We investigated the water quality of the influent and outflow of the wetland during years 2014~2020 to evaluate the performance of pollutant removal through the wetland. Major pollutants (e.g. BOD, COD, SS, T-N, and T-P) were largely reduced during the retention in the wetland while nutrients removal was more efficient than that of organic matters. Pollutant removal efficiency for different inflow concentrations was also investigated to estimate the wetland's capability as a way of managing nonpoint sources. The efficiency of water treatment was significantly higher when inflow concentrations were above 75th percentile for all pollutant, implying the wetland can be applied to the pre-treatment of high pollution load including initial rainfall runoff. Furthermore, the yearly variation of removal efficiency for seven years was analyzed to better understand long-term trends in water treatment of the wetland. The annual treatment efficiency of T-P was very high in the early stages of vegetation growth with high concentration of inflow water. However, it was confirmed that the concentration of inflow water decreased, vegetation stabilized, and the treatment efficiency gradually decreased as the soil was saturated. The findings of the study suggest that artificial wetlands can be an effective method for controlling harmful algal blooms by alleviating pollutant load from the tributaries of Daechung Reservoir.

Yearly Variation in Growth and Yield of Winter Hulless Barley at Iksan (익산지역에서 쌀보리의 생육 및 수량의 연차 간 변화)

  • Choi, Inbae;Kim, Hakshin;Hwang, Jaebok;Gu, Bonil;Bae, Huisu;Park, Taeseon;Park, Hongkyu;Lee, Geonhwi
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.61 no.3
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    • pp.171-183
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    • 2016
  • The effects of weather variations on winter hulless barley were analyzed using data obtained from winter crop situation test at Iksan from 1985 to 2015. The wintering stage in the 16 years from 2000 to 2015 has become colder and shorter than that in the previous 15 years from 1985 to 1999. This has resulted in an early sequence of regrowth date, heading date, and ripening date. Heading date of hulless barley was mostly influenced by regrowth date and period of stem elongation. Futher, the regrowth date and period of stem elongation were strongly negatively correlated with the average air temperature in February and the maximum air temperature in March, respectively. The number of spikes per $m^2$ and 1000-grain weight of Saechalssal cultivated from 2003 to 2015 showed strong positive correlations with yield. In early heading years, yield increased with extended ripening period and with increased 1000-grain weight. There was a strong negative correlation between 1000-grain weight and the average temperature during the ripening period. In the 15 years from 1985 to 1999, warm winters contributed to yield increase with increase in the number of spikes per $m^2$ and a long ripening period. In contrast, in the recent 16 years from 2000 to 2015, the large variability in air temperature during the wintering stage, the decreasing number of spikes per $m^2$ and the steadily increasing air temperature and decreasing precipitation during the ripening stage have caused high temperature stress and yield loss in late heading years.

Characteristics of Fruit Quality and Seed Formation Influenced by Pollen Donors in Kiwifruit 'Sunfl' and 'Garmhwang' (수분수 종류에 따른 키위프루트 '선플'과 '감황'의 과실 품질과 종자 형성)

  • Mockhee Lee;Yeon Jin Jang;Seong-Cheol Kim;Hong Lim Kim;Jae-Ho Joa;Jin Gook Kim
    • Journal of Bio-Environment Control
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    • v.33 no.3
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    • pp.148-155
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    • 2024
  • This study aimed to assess the characteristics of fruit quality and seed formation resulting from pollination by four different pollen donors: 'SKK2', 'Deliwoong', 'Pohwa', and 'Chieftain'. The objective was to identify the most effective pollen donor for yielding commercially viable fruits in two cultivars of kiwifruit (Actinidia chinensis var. chinensis): 'Sunfl' and 'Garmhwang'. Over a two-year period, the fruit setting rate for 'Sunfl' and 'Garmhwang' kiwifruit, pollinated by the four donors, consistently exceeded 96%. For 'Sunfl', the heaviest fruit weight was observed when pollinated with 'Deliwoong' for both years, while the lightest fruit was associated with 'Pohwa' in 2021 and 'Chieftain' in 2022. For 'Garmhwang', there was a yearly variation with the heaviest fruit weight linked to 'Deliwoong' in 2021 and 'Chieftain' in 2022. When examining the fruit characteristics of 'Sunfl', the dry matter content was highest when pollinated by 'SKK2', and the soluble solids content peaked with 'Chieftain' in 2021, although no significant differences were observed in 2022. Total and immature seed numbers in 'Sunfl' were highest with hexaploid pollen donors, while the 1000-seed weight was highest with tetraploid pollen donors. For the fruit characteristics of 'Garmhwang', the dry matter content and titratable acidity were highest when pollinated by 'SKK2'. Soluble solids content showed annual variation. Mature and total seed number in 'Garmhwang' were highest with 'Deliwoong' and 'Chieftain', while the immature seed number was lowest with 'SKK2'.

Relationship of Fitness and Substance of Porphyrin Biosynthesis Pathway in Resistant Transgenic Rice to Protoporphyrinogen Oxidase (Protox) Inhibitor (Protoporphyrinogen oxidase (Protox) 저해제 저항성 형질전환 벼의 적응성과 Porphyrin 생합성 경로물질과 관련성)

  • Yun, Young-Beom;Kwon, Oh-Do;Back, Kyoung-Whan;Lee, Do-Jin;Jung, Ha-Il;Kuk, Yong-In
    • Korean Journal of Weed Science
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    • v.31 no.2
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    • pp.134-145
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    • 2011
  • The objectives of this study were to investigate fitness difference in growth and rice yield in herbicide-transgenic rice overexpressing Myxococcus xanthus and Arabidopsis thaliana protoporphyrinogen oxidase (Protox) genes and non-transgenic rice. We also aimed to determine whether these fitness differences are related to ALA synthesizing capacity, accumulation of terapyrroles, reactive oxygen species, lipid peroxidation, and antioxidative enzymes at different growth stages of rice. Plant height of the transgenic rice overexpressing M. xanthus (MX) and A. thaliana (AP37) Protox genes at 43, 50, and 65 days after transplanting (DAT) was significantly lower than that of WT. Number of tiller of PX as well as MX and AP37 at 50 and 65 DAT was significantly lower than that of WT. At harvest time, culm length and yield of MX, PX and AP37 and rice straw weight of MX and AP37 were significantly low compared with WT. The reduction of yield in MX, PX, and AP37 was caused by spikelets per panicle and 1000 grain weight, ripened grain, spikelets per panicle, 1000 grain weight, and ripened grain, respectively. On the other hand, 135 the reduction of yield in MX, PX, and AP37 was also observed in another yearly variation experiment. The reduction of rice growth in MX, PX, and AP37 was observed in seedling stage as well as growth duration in field. There were no differences in tetrapyrrole intermediate Proto IX, Mg-Proto IX and Mg-Proto IX monomethyl ester, reactive oxygen species ($H_2O_2$ and ${O_2}^-$), MDA, antioxidative enzymes (SOD, CAT, POX, APX, and GR) and chlorophyll between transgenic lines and wild type, indicating that accumulated tetrapyrrole intermediate and other parameters were not related to growth reduction in transgenic rice. However, ALA synthesizing capacity in MX, PX, and AP37 at one day after exposure to light and 52 DAT was significantly lower than that of WT. Further study is required to elucidate the mechanisms underlying the growth and yield difference between transgenic and WT lines.

A Study on the Effect of the Changes of Play Facilities on Rules Changes - Focusing on the City of Seoul - (관련법규 변천이 아파트단지 내 어린이놀이터 변화에 미치는 영향 연구 - 서울시 소재 현장을 중심으로 -)

  • Kim, Dong-Chan;Suh, Joo-Hwan;Park, You-Jeong
    • Journal of the Korean Institute of Landscape Architecture
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    • v.37 no.2
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    • pp.26-35
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    • 2009
  • This study is an analysis of the design changes of children's play facilities and the related rules and regulations which causes these changes. Accordingly, it is noticed that a site's change of design by legislation and by yearly alternation influences playground design. First, after revising the provisions for the distance from roads and parking lots, the constructing of safety fences between play facilities and the using of durable materials, alterations of the designs have been made a reality. Second, the design changes after the period of regulation transitions were caused by provisions related to the shelter of evergreens and conditions of the sun. Third, the changes of the playgrounds were related to the substitution of exercise facilities for the local residents and in carrying out a hygiene exam more than twice a year. Because a lack of regulatory standards for the design of playgrounds resulted in compliance based on individual interpretation and because a substitution of exercise facilities is part of the way to alleviate these regulations, the conditions of the site under investigation could be projeced. By such changes of regulations and analysis of alterations of playground design, programs for improvement were suggested. It turned out that the composition of the concrete standard in conformity with regulations required closer observance. Moreover, design standards for children's playgrounds are needed, such as the provision of variation in external appearance, the creation of more flexible layouts and the outlining of spaces by themes.

Comparative Analysis on the Biomass Production between Machine-Transplanted and Water-Broadcast Seeded Silage Rice in the Central Plain Area of Korea (중부 평야지에서 사료용 벼 기계이앙과 담수산파 재배의 건물 생산성 비교 분석)

  • Yang, Woonho;Park, Jeong-Hwa;Kang, Shingu;Kim, Sukjin;Choi, Jong-Seo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.63 no.3
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    • pp.186-195
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    • 2018
  • A field study was conducted over a 3-year period from 2014 to 2016 in the central plain area, Suwon, Korea, 1) to compare the biomass production between machine-transplanted and water-broadcast seeded silage rice and 2) to elucidate the growth factors that affect the difference in biomass production between the two cultivation practices. The heading date for the water-broadcast seeded silage rice was September 11-18, which was delayed by 11-17 days when compared to that for the machine-transplanted silage rice. On average, water-broadcast seeded silage rice had a shorter plant height, more panicles per area, and a greater biomass production because of the increased straw dry weight. However, the difference in dry weight of each plant organ between the two cultivation practices exhibited yearly variation. When the data were pooled across experimental years, cultivation practices, and varieties, biomass production was highly positively correlated with straw dry weight but not with panicle dry weight. When the ratio of water-broadcast seeding to machine-transplanting was analyzed, total dry weight and straw dry weight were positively associated with each other, whereas no relationship was found between total dry weight and panicle dry weight. Despite that water-broadcast seeded silage rice produced more panicles per area than machine-transplanted silage rice, the two cultivation practices had a similar dry weight per culm. Therefore, we conclude that the silage rice from the water-broadcast seeding, compared to the machine-transplanting, produced more biomass because of the combination of the increased panicle number per area and a similar dry weight per culm. These results suggest that silage rice could be produced through water-broadcast seeding to increase biomass production with low labor and cost input.

Species Diversity Analysis of the Mushroom in Mt. Chiak (치악산 발생 버섯의 종 다양성 비교 분석)

  • Lee, Byung Kook;Eom, Ki Cheol;Seok, Soon Ja
    • The Korean Journal of Mycology
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    • v.41 no.2
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    • pp.57-66
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    • 2013
  • The mushrooms collected at seven areas of Mt. Chiak in 2002 and 2003 were classified to analyse the distribution and species diversity. Frequency (number of mushroom : N), number of species (S), relative species density (RSD), similarity index (C), richness index (R1), variety index (V1), evenness index (E2), and dominance index(D1) were investigated. Total N and S was 143 and 84, respectively. The RSD was 0.179 ~ 0.226 of the 7 areas. The yearly C of the total area (0.213) was 8.2%. more higher than the average C of 7 areas (0.131). The order in the coefficient of variation (CV) of the indicator for 7 areas was N (10.5%) > D1 (9.2%) > V1 (8.9%) > S (8.5%) > R1 (7.4%) > E2 (2.2%). The average R1 of the 7 areas was 5.36 with the range from 4.85 to 6.01, and 16.72 for the total area. The average V1 of the 7 areas was 16.24 with the range from 14.44 to 18.66, and 68.82 for the total area. The average E2 of the 7 areas was 0.95 with the range from 0.926 to 0.982, and 0.819 for the total area. The average D1 of the 7 areas was 0.071 with the range from 0.055 to 0.073, and 0.081 for the total area. The correlation between N and 5 kinds of diversity indicator (S, R1, V1, E2, D) was not statistically significant, but the correlation between R1, E2 and D1 was statistically significant each other.

Characterization of Weed Occurrence in Major Horticultural Crops - III. Phenological Aspects of Major Weeds (원예경작지(園藝耕作地)에서의 잡초발생(雜草發生) 특성에 관(關)한 연구(硏究) - III. 주요잡초종(主要雜草種)의 발생계절성(發生季節性))

  • Woo, I.S.;Pyon, J.Y.;Guh, J.O.
    • Korean Journal of Weed Science
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    • v.9 no.2
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    • pp.130-140
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    • 1989
  • 1) Dormancy brocken weed seeds were planted in soil at 15 days interval from June to December in 1986 and 1987 and test of normality and normal distribution curve were made to determine seasonal distribution characteristics of weed emergence in fields. Monthly emergence distribution pattern of each species can be concluded as following normal distribution equations. E. crusgalli $y={\frac{1}{2.52{\sqrt{2{\pi}}}}}e^{-{\frac{(x-10.057)^2}{12.7}}}$ E. indica $y={\frac{1}{2.17{\sqrt{2{\pi}}}}}e^{-{\frac{(x-9.16)^2}{9.45}}}$ A. lividus $y={\frac{1}{7.74{\sqrt{2{\pi}}}}}e^{-{\frac{(x-10.06)^2}{15.46}}}$ S. nigrum $y={\frac{1}{2.7{\sqrt{2{\pi}}}}}e^{-{\frac{(x-9.695)^2}{14.58}}}$ C. busrsa-pastoris $y={\frac{1}{2.83{\sqrt{2{\pi}}}}}e^{-{\frac{(x-9.02)^2}{16.02}}}$ D. sanguinalis $y={\frac{1}{2.8{\sqrt{2{\pi}}}}}e^{-{\frac{(x-8.58)^2}{15.67}}}$ S. viridis $y={\frac{1}{2.72{\sqrt{2{\pi}}}}}e^{-{\frac{(x-9.36)^2}{14.8}}}$ C. album $y={\frac{1}{2.596{\sqrt{2{\pi}}}}}e^{-{\frac{(x-8.07)^2}{13.48}}}$ P. oleraeda $y={\frac{1}{2.45{\sqrt{2{\pi}}}}}e^{-{\frac{(x-10.83)^2}{12.01}}}$ 2) Emergence peak period of weed species tested were from the end of May to early August and yearly variation of emergence was observed in E. crus-galli, S. viridis, S, nigrum, and P. oleracea and this fact may more related to rainfall pattern rather than temperature.

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