• 제목/요약/키워드: 중성식물

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Ecological Study on Arbuscular Mycorrhizae(AM) at Coastal Reclaimed Lands (해안(海岸) 간척지(干拓地)에서 Arbuscular Mycorrhizae(AM)에 관한 생태학적(生態學的) 연구(硏究))

  • Koh, Sung-Duk
    • The Korean Journal of Mycology
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    • v.22 no.4
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    • pp.394-409
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    • 1994
  • The symbiotic activities of arbuscular mycorrhizal fungi(AMF) such as spore density, symbiotic intensity and vesicle density, phytomasses of higher plants such as Calamagrostis epigeios, Imperata cylindria, Artemisia scoparia, Aster tripolium and Sonchus brachyotus and seasonal change of the AMF activities, electric conductivity and zinc contents in plant and soil were determined in the rhizospheres of higher plants at abandoned old coastal reclaimed lands, where constructed in 12 and 30 years ago. If plants of reclaimed land classified to salinity, symbiotic activities of AMF were high in order of obligate halophyte, facultative halophyte and glycophyte. Also, those plants classified to life form, symbiotic activities of AMF were high in order of annual, biennial and perennial plants. Seasonal variation of spore density, one of symbiotic activities showed that the plateau density maintained continuously from the end of growing season of the higher plants to next spring. For this reason, it regarded that reproduction of AMF spore would be formed in autumn, when the higher plants will be developed. Seasonal change of symbiosis intensity, other symbiotic activities, however, showed that the highest symbiosis intensity occurred in spring and summer but the lowest in autumn. In relationships among symbiotic activities, spore density was directry proportional increase of symbiosis intensity. Moreover, phytomass of higher plants also was directly proportional to increase the spore density as well as symbiosis intensity. Vesicle density, however, did not any correlation with the phytomass, spore density and symbiosis intensity. From these results, it can know that both spore density and symbiosis intensity are strongly possible to use as the measure of symbiotic activity owing to symbiosis of tho-AMF, the more absorption of zinc by the higher plants carried out the less concentration of zinc in the soil.

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Effect of Inhibitors of Ethylene Production on Growth and Gravitropism Inhibited by Oryzalin in Arabidopsis Roots (애기장대 뿌리에서 ethylene 생성 억제제가 oryzalin에 의해 억제된 뿌리 생장과 굴중성 반응에 미치는 영향)

  • Park, Ho Yeon;Ahn, Donggyu;Kim, Soon Young
    • Journal of Life Science
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    • v.31 no.3
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    • pp.280-286
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    • 2021
  • Oryzalin is a herbicide that disrupts the arrangement of microtubules by binding to tubulin, thereby blocking the anisotropic growth of plant cells. Microtubules and microfilaments are cytoskeleton components that have been implicated in plant growth through their influence on the formation of cell walls. Microtubules also play roles in the sedimentation of amyloplasts in the root tip columella cells; this sedimentation is related to gravity sensing and results in downward root growth in the soil for absorption of water and minerals. However, the orientation of microtubules changes depending on the level of ethylene in plant cells. A recent study reported that oryzalin stimulated ethylene production via 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and ACC oxidase and caused a concentration-dependent inhibition of root growth and gravitropic responses. The aim of the present study was to investigate the possibility that oryzalin-induced inhibition might be recovered by the application of inhibitors of ethylene production, such as 10-4 M cobalt ions and 10-8 M aminoethoxyvinylglycine (AVG). The inhibition of root growth and gravitropic response was overcome by 10-20% by an 8 hr treatment with cobalt ions or AVG. These results suggest that ethylene levels could regulate root growth and gravitropic responses in Arabidopsis.

Responses of Transgenic Tobacco Plants Expressing Sweet Potato Peroxidases to Gamma Radiation (감마선에 대한 고구마 Peroxidase 형질전환 담배식물체의 반응)

  • 윤병욱;이행순;권석윤;김재성;곽상수
    • Korean Journal of Plant Tissue Culture
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    • v.26 no.4
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    • pp.265-269
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    • 1999
  • Transgenic tobacco plants expressing either a sweet potato anionic peroxidase (POD) (swpal) or neutral POD (swpnl) were irradiated by gamma radiation, and the gamma radiation-induced biochemical changes in antioxidant enzymes and plant growth inhibition were investigated at 30 days after treatment. Gamma radiation significantly inhibited the growth of all plants regardless of transgenic or nontransformed plants, showing a dose-dependent inhibition. In high dosage of 50 and 70 Gy, plant heights were severely retarded and new leaves does not emerged. No significant changes in antioxidant enzymes such as POD, superoxide dismutase and catalase were observed in all plants regardless of irradiation dosages ranging from 10 to 50 Gy. These results suggest that sweet potato PODs may be not involved in the protection against the oxidative stress induced by gamma radiation.

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Antimicrobial Activities of the Extracts of Vegetable Kimchi Stuff (식물성 김치재료추출물의 항미생물활성)

  • Kim, Seon-Jae;Park, Keun-Hyung
    • Korean Journal of Food Science and Technology
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    • v.27 no.2
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    • pp.216-220
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    • 1995
  • In order to investigate the possible use of vegetable kimchi stuff as natural preservatives for kimchi, the methanol extracts of 15 kinds of vegetable kimchi stuff were solvent-fractionated and fractions were tested for antimicrobial activities against Leuconostoc mesenteroids, Pediococcus cerevisiae, Lactobacillus plantarum and Saccharomyces cerevisiae. The neutral fractions of the extracts of garlic and leek showed strong antimicrobial activities. The extract of leek showed particularly strong antimicrobial activities against Ped. cerevisiae and L. plantarum that were known to be main microorganism of fermentation and acidification of kimchi. The results suggest the possible use of the leek extract as natural preservatives for kimchi.

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Inhibitory Effects of Ethanol Extract of Red Sweet Pepper (Capsicum annuum L.) on Triglyceride Biosynthesis in Rhodosporidium toruloides (Rhodosporidium toruloides에서의 적색 파프리카 에탄올 추출물의 중성지방 억제 효과)

  • Kang, Ju-Won;Lee, Seung-Je;Ahn, Byung-Yong
    • Korean Journal of Plant Resources
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    • v.34 no.2
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    • pp.186-196
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    • 2021
  • In this study, we investigated inhibitory effect of red sweet pepper (Capsicum annuum L.) on triglyceride biosynthesis in Rhodosporidium toruloides. There was no significant difference in the total lipid content of all the experimental groups including 0.02, 0.1 and 0.5% (w/v) of red sweet pepper 70% ethanol extract treatment (RSPE). However, the triglyceride content was significantly decreased in RSPE group campared to the control group. When the formation of lipid droplet in the oleaginous yeast was examined, a small amount of fluorescence was observed compared to the control as the concentration of RSPE increased. The number of cells and free fatty acid increased in a concentration-dependent manner. These results suggest that RSPE has an anti-obesity effect.

Study of Toxic Gas Removal Characteristics by Chemical Analysis of Essential Oil using SPME Method (SPME법을 이용한 식물정유 성분분석을 통한 유해가스 제거 특성연구)

  • 박영규
    • KSBB Journal
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    • v.19 no.3
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    • pp.231-235
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    • 2004
  • This paper was investigated to clarify the possibility of ammonia gas removal by essential oil. First of all, the chemical analysis was peformed to analyze the composition of an essential oil by GC-MS. The monoterpenes in an essential oil react with ammonia by neutralization and their reaction mechanism was elucidated. Based on their chemical neutralized reaction, the removal efficiencies of ammonia gas were studied to derive the optimal conditions in the scrubber tower such as optimal temperature and pH. The experimental result shows that the removal efficiency of ammonia gas was achieved over 98 % by the misty aerosol dispersion of scrubber tower.

Characteristics of antimicrobial activity of Streptococcus salivarius K12 by culture condition (Streptococcus salivarius K12의 배양조건에 따른 항균활성의 특징)

  • Song, Young-Gyun;Lee, Sung-Hoon
    • Journal of Dental Rehabilitation and Applied Science
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    • v.37 no.4
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    • pp.244-250
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    • 2021
  • Purpose: The purpose of this study was to examine effects of culture conditions on the growth and antibacterial activity of Streptococcus salivarius K12. Materials and Methods: S. salivarius K12 was cultivated in medium containing animal and plant protein or in medium of neutral and acidic conditions. The growth of S. salivarius K12 was measured every 2 hours by a spectrophotometer. The antimicrobial activity of S. salivarius K12 against Streptococcus mutans and Porphyromonas gingivalis was investigated by the susceptibility assay using the spent culture medium. Results: the growth of S. salivarius K12 showed faster in medium containing plant protein and neutral pH condition. The antimicrobial and antifungal activity of S. salivarius K12 appeared stronger in medium containing plant protein than animal proteins. Conclusion: For application of S. salivarius K12 to bacterial oral disease, co-substances may be needed for S. salivarius K12 to colonize in the oral cavity and enhance the antimicrobial activity.

Effect of Ascorbic Acid on the Gravitropic Response of Primary Roots in Maize (옥수수 일차뿌리에서 Ascorbic acid가 굴중성 반응에 미치는 효과)

  • Kim, Chung Su;Mulkey, Timothy J.;Kim, Soon Young
    • Journal of Life Science
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    • v.24 no.12
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    • pp.1364-1370
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    • 2014
  • Ascorbic acid (AA) is a multifunctional metabolite in plants that is essential for plant development and growth. We examined the effect of AA, an antioxidant, on the gravitropic response of primary roots in maize. The application of $10^{-3}$ M AA to the elongation zone did not affect the gravitropic response and slightly inhibited the root growth. However, treatment with both $10^{-5}$ M and $10^{-3}$ M AA at the root tip increased the gravitropic response and inhibited root growth. Differences in indole-3- acetic acid (IAA) activity between the upper and lower hemispheres of the root resulted in differential elongation along the horizontal root. Roots are extremely sensitive to IAA, and increasing the amount of IAA in the lower hemisphere of the root inhibited elongation. Therefore, we examined the effect of IAA in the presence of AA. The inhibitory effect of AA on the gravitropic response was greater in combination with IAA. To understand the role of AA in the regulation of root growth and the gravitropic response, we measured ethylene production in the presence of AA in the primary roots of maize. AA stimulated ethylene production via the activation of the 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase gene, which regulates the conversion of ACC to ethylene. These results suggest that AA alters the gravitropic response of maize roots through modification of the action of ethylene.

Plant Distributions and Physicochemical Characteristics of Topsoil on the Reclaimed Dredging Area (임해준설매립지 식물분포와 표층토양의 이화학적 특성)

  • Nam, Woong;Kwak, Young-Se;Jeong, In-Ho;Lee, Deok-Beom;Lee, Sang-Suk
    • Journal of the Korean Institute of Landscape Architecture
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    • v.36 no.3
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    • pp.52-62
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    • 2008
  • By analyzing specific plant distributions and physicochemical characteristics of topsoil in a reclaimed dredging area, baseline data was found of natural landscape planting sites, and developing dredged fill ground. The reclaimed dredging area is five different stands (1, 2, 3, 4 and 5) which were examined in this research. They are located from sea level to 15 meters in altitude and exhibited typical characteristics of the salt marsh in Gwangyang Bay. Species with high constancy in the vegetation on the reclaimed soil were classified into four stages. A total of 12, 15, 22, 27 and 35 different plant species were found and also increased in stands 1, 2, 3, 4 and 5, respectively. Moving from stand 1 to 5, halophytes decreased and non-halophytes increased. Desalination at each stage of the reclaimed dredging area was a driving force affecting the performance and distribution of halophytes and non-halophytes. Overall, 35 quadrats of soil were selected and analyzed for specific physicochemical characteristics of topsoil between O${\sim}$20cm. Results of the physicochemical analysis such as altitude, slope, vegetation and kind of reclaimed dredging soil, exhibited irregular increases or decreases. As survey areas moved from stand 1 to 4, desalination areas, soil acidity, electric conductions, content of salinity, available phosphorus, potassium, chlorine, calcium, and magnesium indicated decreasing patterns; however, total nitrogen, silt, and clay content increased. Cluster analysis and PCA by environmental data within the stands clearly showed five distinct vegetation patterns on the tested reclaimed area. These results indicate that the differences of performance and distribution of vegetation are due to the SAR in the reclaimed soil and related to the natural survival strategy at the given hostile habitat.

Soil Salinity and Continuum Distribution of Vegetation on the Three Reclaimed Tidal Flats of Kyonggi-Bay in the Mid-West Coast of Korea (한국 중부 서해안 경기만 일대 3개 간척지의 토양 염농도와 식생의 연속분포)

  • Kim, Eun-Kyu;Chun, SoUl;Joo, Young-K.;Jung, Yeong-Sang;Jung, Hyeung-Gun
    • Korean Journal of Soil Science and Fertilizer
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    • v.41 no.2
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    • pp.83-93
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    • 2008
  • Assessing for flora distribution is necessary for land management and environmental research in reclaimed lands. This study was conducted to find out the relationship between vegetation distribution and soil salinity on three reclaimed tidal flats of Kyonggi-bay in the mid-west coast of Korea. We investigated the soil salinity and identified the vegetation at the continuum distribution spots, and describe the characteristics of continuum distribution. On the reclaimed tidal flats, spatial variation of vegetation formed partially, however as the result for connection of each spatial variation along with the soil salinity, continuum distribution formed and it was overlapped edaphic gradient with vegetation distribution, it means that the continuum distribution correspond with soil salinity gradient, as the evidence high salt tolerance species occurred at high saline spots, non salt tolerance species occurred at low saline spots. On the aged reclaimed tidal flats, continuum type was various and also clearly distinguished but it was not clear on the early stage of reclamation. The continuum distribution distinguished sequential and non-sequential type. Sequential type started from high saline zone and connected to low saline zone gradually, on this type, vegetation changed from pioneer halophyte to facultative halophyte and glycophyte along with the salinity gradient. Non-sequential type formed by non-sequential change of soil salinity, on this type, vegetation distribution was non-regular form because it has not changed gradually. In the aged reclaimed land, vegetation wilted zone existed with high salinity, and continuum distribution started from this zone with bare patch.