• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.2
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• pp.247-253
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• 1997

Development of soybean cultivars with great nodulation and high nitrogen fixation activity, derived mostly from mutagenesis, may decrease inputs of chemical fertilizer nitrogen into the soil-plant system. Soybean seeds (cv. Jangyupkong, Hwanggeumkong, and Geomjungkong 1) were treated with three different levels of EMS (ethyl methanesulfonate) concentration(30, 50, and 70mM). Increasing the doses of EMS resulted in decreased field emergence rate of seeds, whereas it did not increase M$_2$ mutation frequencies. This indicated that the most efficient concentration of EMS was 30mM for generating mutants. Extensive mutagenesis of Sinpaldalkong 2 with 30mM EMS was undertaken to isolate soybean mutants with greater nodulation. Approximately 8, 200 M$_2$ families were screened for greater nodulation on 5 mM nitrate after inoculation with Bradyrhizobium japonicum strain YCK213-KFCC-10728. Mutant SS-2 nodulated more than the wild type. Comparison of supernodulation between SS-2 and two nts mutants(nts 1007 and nts 1116) revealed that SS-2 showed the supernodulation character at an earlier growth stage than the two nts mutants. Further studies should be needed to characterize the difference in timing of nodulation between SS-2 and nts mutants.

• Journal of agriculture & life science
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• v.50 no.5
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• pp.81-93
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• 2016

Rehmannia glutinosa(Gaertn.) DC. is a herbaceous perennial plant and belonging to the Scrophulariaceae and used as roots for medicinal part and purpose. R. glutinosa is and usually used for fresh rehmannia root or prepared rehmannia root. However, it is very difficult to propagate using the seeds because of lack germination so it is propagated using the vegetative method as the rootstock. Currently, propagation and harvesting using the rootstock of R. glutinosa has difficulties about production of the high quality and quantity in R. glutinosa because of root rot disease. To optimize in vitro cultures and to improve the rootstock and seedling of R. glutinosa after morphological and genetical determination, 5 plant culture media (MS, DJ, LS, QL, and WPM) were used in this study then WPM was selected for better growth, for multiplication condition(WPM + IAA 1.0 mg/L + IBA 0.5 mg/L), and for root enlargement condition(WPM + NAA 0.1 mg/L) of R. glutinosa. Based on these results, in vitro seedlings of R. glutinosa were transferred to soil for acclimation with environment adaptation and shown the positive effects about root enlargement and root formation. Therefore, it can be used for high quality of R. glutinosa production and production of the rootstock based on propagation using in vitro seedlings of R. glutinosa.

• Research in Plant Disease
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• v.29 no.4
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• pp.459-463
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• 2023

This study was conducted to investigate the plant-parasitic nematodes of ornamental foliage plants, citrus orchards, and tea plantations from July to December 2022. As a result of the investigation of plant-parasitic nematodes in 415 foliage plants, root-lesion nematodes were detected most frequently, followed by root-knot nematodes, pin nematodes, and other nematodes. In tea plantations, spiral nematodes, cyst nematodes, and root-knot nematodes were detected. Citrus nematodes, ring nematodes, and root-knot nematodes were discovered in citrus orchards. In foliage plants, tea plantations, and citrus orchards, the detection rate of plant-parasitic nematodes was not high, but root-lesion nematodes were detected. Therefore, it is necessary to apply appropriate control methods to manage root-lesion nematodes during the cultivation of foliage, tea, and citrus plants.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.10
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• pp.1594-1600
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• 2004

Effects of mistletoe (Viscum album) extract and pueraria (Pueraria radix) extract on cellular NF-$textsc{k}$B activity were evaluated in human malignant keratinocytes (SCC-13) to elucidate the possible correlation of NF-$textsc{k}$B with antioxidant activity. The antioxidant activities of these natural extracts were examined in four different evaluation methods, i.e., lipid peroxidation value (POV) evaluation test, I,l-diphenyl-2-picrylhydrazyl radical (DPPH), nitric oxide (NO) scavenging test, and reducing power assay. Pueraria extract (0.5 mg) and mistletoe extract (5 mg) downregulated the cellular NF-$textsc{k}$B activation up to 35% and 10% compared to the control, respectively, although their effects were lower than the known NF-$textsc{k}$B downregulator, vitamin C (8.8 mg, 53%) in a cell-based NF-$textsc{k}$B activity assay system. In the POV test, relative antioxidant activities of mistletoe extract (86%) and pueraria extract (75%) were significantly higher than the known antioxidant, vitamin C (48%) at the same concentration (10 mg) and the degree of activity increased in a dose-dependent manner. Pueraria extract showed more potential radical scavenging activities than those of mistletoe extract evaluated in both DPPH and NO test. Especially, the NO radical scavenging activity of pueraria extract ($SC_{50}$/, 88 $\mu$g) was comparable to that of vitamin C ($SC_{50}$/, 77 $\mu$g). Even pueraria extract possessed a much less reducing power compared to vitamin C, it also revealed higher reducing power than that of mistletoe extract. These results indicate that mistletoe extract and pueraria extract may serve as an useful natural antioxidant agents, and led to suggest the hypothesis that compounds having an antioxidant activity, i.e., radical scavenging activity or reducing power may be correlated with the downregulation of NF-$textsc{k}$B activation in human keratinocytes.

• The Korean Journal of Ecology
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• v.27 no.3
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• pp.165-171
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• 2004

Weight loss and nutrients dynamics during decomposition of oak roots (diameter classes: R₁〈0.2㎝, 0.5㎝〈R₂〈1㎝, 1㎝〈R₃〈2㎝, 2㎝.〈R₄〈4㎝) (Quercus acutissima) were studied for 33-months in Kongiu, Korea. After 33-months, decomposition rate of R₁, R₂, R₃ and R₄ was 49.6%, 47.5%, 66.4% and 66.1%, respectively. The decomposition constant(k) for R₁, R₂, R₃, and R₄ was 0.249/yr, 0.234/yr, 0.397/yr and 0.393/yr, respectively. Larger diameter class of the root lost more weight than smaller diameter class. N concentration in decomposing oak roots increased in all diameter classes. After 33-months, remaining N in R₁, R₂, R₃ and R₄ was 66.5%, 80.7%, 84.4% and 44.4%, respectively. K concentration in decomposing oak roots decreased in early part of decomposition and then increased in later stage of decomposition. After 33-months, remaining P in R₁, R₂, R₃ and R₄ was 64.7%, 62.4%, 93.1% and 30.7%, respectively. K concentration in decomposing oak roots decreased rapidly in early stage of decomposition. Remaining K in R₁, R₂, R₃ and R₄ was 11.6%, 10.6%, 5.9% and 7.7%, respectively. Ca concentration in decomposing oak roots showed different among diameter classes. After 33-months, remaining Ca in R₁, R₂, R₃ and R₄ was 66.2%, 51.0%, 39.1% and 48.3%, respectively. Initial concentration of Mg in oak root was higher in smaller diameter class. After 33-months, remaining Mg in R₁, R₂, R₃ and R₄ was 15.3%, 29.9%, 24.5% and 69.4%, respectively.

• 농업기술회보
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• v.48 no.3
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• pp.21-22
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• 2011

1980년대 후반부터 정부의 규제가 약해진 틈을 타 화학농약 사용이 일반화되면서 인삼수량은 획기적으로 늘었으나 농약남용의 문제가 발생했다. 또한 단기간에 인삼뿌리를 굵게 키우기 위해 앙분이 과잉 축적된 가축분 퇴비를 과용하게 되었고, 초작지 부족으로 연작지가 늘어남에 따라 뿌리썩음병과 같은 병해도 증가하여 수량과 품질이 떨어지는 결과를 초래했다.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.1 no.3
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• pp.28-32
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• 1980

6월은 1년중 가장 바쁜 농사철이다. 논에 2모작으로 심었던 밀, 보리, 감자, 마늘, 양파 그리고 여러가지 채소류를 빨리 거둬들이고 모내기를 해야할 때이며 5월중에 심었던 1모작논의 기음약뿌리기, 새끼칠거름주기 그리고 농약뿌리기 등 많은 일을 해야할 때이다. 그런데 농사일은 알맞은 때가 있으므로 때를 놓치지 말고 해야하며 모든 농사일 하나하나를 정밀하고 차질없도록 하여야만 다수확할 수 있는 것이다.

• 한국약용작물학회:학술대회논문집
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• 2007.11a
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• pp.306.2-306.2
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• 2007

• The Science & Technology
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• v.33 no.10 s.377
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• pp.25-27
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• 2000

20세기 인류생활에 가장 큰 공헌을 한 공학기술은 전기와 전자공학 분야이다. 전기ㆍ전자공학의 뿌리를 찾는다면 1백년 전 2천개의 특허를 낸 에디슨의 업적에서 비롯된다. 오늘날 우리에게는 산업혁명에 견주어지는 기술혁명을 겪고 있는데 이러한 기술혁명은 진공관으로부터 트렌지스터, IC, VLSI로 변천해오면서 발전된 반도체기술을 기반으로 디지털기술이 발전되었고 이를 통해 생겨난 디지털 혁명이 바로 그것이다.

• 열린충남
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• s.54
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• pp.6-9
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• 2011

올해 2회를 맞이하는 2011금산세계인삼엑스포는 9월 2일부터 10월 3일까지 32일간 금산군 신대리 국제인삼유통센터 일원에서 "생명의 뿌리, 인삼"이라는 주제로 개최된다. 인삼을 통한 금산지역의 경제적 도약과 건강 생명도시로서 금산의 미래 비전을 제시하는 세계적인 수준의 엑스포이다. 자연의 과학이 만든 생명밸런스라는 부제 아래 인삼의 생명산업화의 가능성을 보게 될 행사 속으로 미리 떠나보자.