• Proceedings of the Plant Resources Society of Korea Conference
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• 2002.11b
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• pp.73-73
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• 2002

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2004.10a
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• pp.194-194
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• 2004

• Nuclear Engineering and Technology
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• v.2 no.3
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• pp.179-183
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• 1970

(4-$^{14}$ C) Cholesterol was administered to the leaves of Solanum andigena during photoperiodic induction. Radioactive products converted from cholesterol were studied by thin-layer chromatography and gas-chromatography. The major products from cholesterol were shown to be esterified cholesterol in lipid and solanine in the aqueous ethanolic phase in SD-and LD-leaves. The radioactive solanidine was isolated by chromatography and crystallized to constant specific activity. Short-day condition did not stimulate the conversion of cholesterol into solanine in the leaves, but both groups of leaves converted cholesterol into solanine at the about same rate. Incorporation of radioactivity into aqueous ethanolic phase of tubers and stolons, containing storied glycoalkaloid, was very much higher than that into lipid phase, contrary to those in the leaves and the stems.

• Journal of Life Science
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• v.3 no.1
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• pp.2-8
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• 1993

천연화합물과 합성화합물은 모두 합쳐서 식물생장조절제라 부르고 이들 화합물은 경우에 따라 식물의 기간들의 생장율을 촉진하거나 억제한다. 호르몬이란 용어는 천연적으로 발생하는 색물생장 조절제에 국한되는 것이다. 실제의 응용에 있어서 합성된 생장조절제가 사용되는 것은 이 물질이 생체내에서 안정도가 더 크기 때문이다. 따라서, 합성물질은 식물 호르몬의 구조적인 유사성으로 흉내를 내거나 내생 호르몬들의 생합성, 전류, 및 대사를 조정해서 그 수준을 조절하게 된다. 그래서, 식물생장 조절물질들의 기능과 가능력을 이해하기 위해서 분자수준에서 식물호르몬들의 작용의 양상을 고찰한다.

• Korean Journal of Soil Science and Fertilizer
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• v.37 no.4
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• pp.266-287
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• 2004

The non infecting, plant associated bacteria have attracted increased attention for stimulating plant growth and as environmental friendly plant protecting agents. Pink-pigmented facultatively methylotrophic bacteria (PPFMs), classified as Methylobacterium spp., are persistent colonizers of plant leaf surfaces. As the leaves of most or all plants harbor PPFMs that utilize leaf methanol as their sole source of carbon and energy, which is a specific attribute of the genus Methylobacterium. Although they are not well known, these bacteria are co-evolved, interacting partners in plant metabolism. This claim is supported, for example, by the following observations: (1) PPFMs are seed-transmitted, (2) PPFMs are frequently found in putatively axenic cell cultures, (3) Low numbers of seed-borne PPFMs correlate with low germinability, (4) Plants with reduced numbers of PPFM show elevated shoot/root ratios, (5) Foliar application of PPFMs to soybean during pod fill enhances seed set and yield, (6) Liverwort tissue in culture requires PPFM-produced vitamin B12 for growth, (7) treated plants to suppress or decrease disease incidence of sheath blight caused by Rhizoctonia solani in rice, and (8) the PPFM inoculation induced number of stomata, chlorophyll concentration and malic acid content, they led to increased photosynthetic activity. Methylobacterium spp. are bacterial symbionts of plants, shown previously to participate in plant metabolism by consuming plant waste products and producing metabolites useful to the plant. There are reports that inform about the beneficial interactions between this group of bacteria and plants. Screening of such kind of bacteria having immense plant growth promoting activities like nitrogen fixation, phytohormone production, alleviating water stress to the plants can be successfully isolated and characterized and integration of such kind of organism in crop production will lead to increased productivity.

• Korean journal of applied entomology
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• v.61 no.1
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• pp.143-154
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• 2022

Plant secondary metabolites play an important role in insect-plant interactions. Herbivorous insects have various strategies to cope with the plant defensive compounds. Polyphagous insects feed on a wide variety of plant species, and their detoxification mechanisms are more complex since they tend to respond to a large array of different plant-derived chemicals. Alternatively, oligophagous insects specialize on only a few related plant species and may be expected to have a more efficient form of adaptation. This adaptation could involve either the production of large quantities of enzymes to detoxify their defensive compounds or the sequestration of the compounds or their metabolites. The oriental tobacco budworm, Helicoverpa assulta, is a specialist herbivore, feeding on a few plants of Solanaceae, such as tobacco and hot pepper. Understanding its host-plant adaptation not provides an important insight on physiology, ecology and evolution of specialist herbivores, but also gives a clue to develop management strategies of the pest species such as H. assulta. This paper briefly reviews the specialist, H. assulta, focusing on its host range, larval associations with the host plants, and detoxification mechanisms to nicotine and capsaicin, two characteristic defensive compounds derived from its two major host plants, tobacco and hot pepper, respectively. It summarizes the relevant research over the last half century and provides a future perspective on this subject.

• Bulletin of Food Technology
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• v.13 no.2
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• pp.3-13
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• 2000

신선 과일, 채소 편의식품의 주요 특징으로는 박피, 절단 등에 의한 식물조직의 손상, 최소가공에 따른 제품의 불확실한 미생물 안전성, 식물 조직의 활발한 물질대사, 제품 종류의 제한 등을 들 수 있다. 따라서 이들 제품에서는 미생물이 증식하기 쉬우나 실제 미생물의 거동은 식물조직의 대사에 의해 영향을 받으며, 또한 생체의 호흡과 필름 포장재의 기체투과도에 의해 좌우되는 포장내부 환경기체에도 영향을 받는다. 수확후 감염은 과일, 채소와같은 원료 농산물의 주요 손실요인으로(Harvey, 1978;Lund, 1983) 신선 과채류 편의식품의 경우 절단면의 노출과 포장내부의 고수분 함량 등에 의해 미생물 감염의 위험은 더욱 더 증가할 수 있다. 특히 대부분의 신선 편의식품이 어떠한 가열처리도 없이 그대로 이용되므로 식품유래 병원균의 오염과 저장중 이들의 증식은 각별한 관심의 대상이 되고 있다. 이에 본고에서는 현재 과채류 편의식품에 주로 사용되고 있는 미생물 오염 방지 또는 조절 방법에대해 설명하고 이의 적용과 관련한 주의사항을 살펴보고자 한다.

• Korean Journal of Weed Science
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• v.17 no.2
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• pp.199-206
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• 1997

Chlorsulfuron, an acetolactate-synthase-inhibiting sulfonylurea herbicide, induces many metabolic and physiological changes in susceptible plants. The objective of this study was to determine to what extent chlorsulfuton-induced phytotoxicity was due to a shortage of final products(the branched-chain amino acids valine, leucine, and isoleucine) or to an accumulation of a toxic metabolite(2-ketobutyrate), or both, in a susceptible species. Chlorsulfuron-treated canola seedlings showed growth inhibition and injury symptoms that included chlorosis, downward leaf rolling, and accumulation of anthocyanins. Supplementation with valine, leucine, and isoleucine prevented the chlorsulfuron-induced growth inhibition and injury symptoms only partially, suggesting that factor(s) other than a shortage of the branched-chain amino acids also are involved in the phytotoxicity. Canola seedlings treated with 2-ketobutyrate showed reduced growth, but they showed different changes in metabolites than seedlings treated with chlorsulfuron. The results suggest that 2-ketobutyrate is not involved in chlorsulfuron-induced phytotoxicity. We conclude that chlorsulfuron-induced phytotoxicity is due at least in part to a shortage of branched-chain amino acids.

• Applied Biological Chemistry
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• v.20 no.2
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• pp.221-227
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• 1977

Contents of proline and chloride in halophytes were $80-1700\;{\mu}g/gfw$ and 0.13-0.45 mM/gfw respectively. The content of proline was inversely proportional to that of chloride. Rhizomes of Phargmites communis Trin, a halophyte, were grown in non-saline medium and then taken to saline treatment for one or two weeks. Growth of P. communis was inhibited when salinized with 0.25M NaCl. Total nitrogen decreased and alcohol soluble nitrogen and proline increased when growth was retarded. The quantity of Fraction 1 protein decreased at 0.25M NaCl treatment. The accumulation of proline at high concentration in P. communis suggested that it might play a role in osmotic adjustment.

• Journal of Life Science
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• v.3 no.1
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• pp.18-24
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• 1993

毒에는 비소, 수은처럼 無機毒과 식물, 동물성의 有機毒이 있으며, 有機毒에는 알카로이드, 배당체, 단백毒 등이 있다. 식물의 알카로이드毒을 중심으로 이것이 어떻게 藥物로서 이용되어 왔는지에 관해 다루었다. Morphine의 발견을 계기로 여러 종류의 식물 알카로이드가 계속 분리되었으며, 藥의 탐구의 새로운 길을 열었다. Morphine은 우수한 진통의 효과를 가졌지만, 흡수억제 및 습관성의 결점을 가지고 있다. 또, Areca catechu L. 의 종자(빈낭자)에는arecoline, arecaidine 등의 piperidine系의 알카로이드를 함유하고 있다. Arecoline은 副交感神經 흥분작용이 있고, 침분비 촉진, 比瀉 등으로 사용되어 왔지만, 지금은 그 용도가 적어졌다. 그리고 화살독이 되는 毒을 약물로 사용한 것은 Acontium屬 식물이 유일한 것이다. 중국에서는 이를 身體四肢關節의 마비, 疼痛의 회복, 대사기능실조의 회복 등의 목적으로 사용해 왔다.