• 유기물자원화
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• 제2권1호
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• pp.65-73
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• 1994

본 연구는 지렁이 분립의 혼합비율이 고추 플러그묘의 생육에 미치는 효과를 조사하기 위하여 수행되었다. 본 연구에서는 지렁이의 분립은 20,30,40,50%로 투입하고 나머지는 peatmoss와 vermiculite로 보충하여 배합하였다. 얻어진 결과는 다음과 같다. 1. 엽수, 엽면적, 건물수량등에서 차이가 있었으며 (0.1%의 통계적 유리성), 지렁이 분립의 혼합비율에 있어서는 엽수, 엽면적 및 경중에서 1%와 엽중, 근중 및 생물학적 건물수량에서는 5%의 유의성이 인정되었다. 2. 지렁이 분립을 혼합한 상토가 국내 시판중인 상토 보다 조사후기에 접어들수록 많은 엽수와 엽면적의 증거를 나타내었다. 3. 지렁이 분립을 처리한 상토에서 대조구보다 전 육묘기간을 통해 엽중, 경중 및 근중 등이 전반적으로 높았는데, 이러한 경향은 지렁이 분립의 비율이 40% 이상에서 현저하였다. 4. 조사시작 후 3주째까지는 엽중이 경중보다 높았지만 4주째 부터는 경중이 더 높았으며, 또한 육묘후기에는 지렁이 분립을 혼합한 처리에서 대조구 보다 경중이 더 높았다. 5. 생물학적 건물수량은 조사초기에는 처리간 차이가 없었으나 후기에는 지렁이 분립을 혼합한 처리구가 대조구 보다 높았다.

• 아시안잔디학회지
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• 제10권2호
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• pp.125-142
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• 1996

Crassulacean acid metaholism (CAM) was investigated in leaves and stems of the succulent $C_4$dicot Portulaca oleracea L. Under 14-hour days, stem tissues showed much greater fluctuation of acidity than leaf tissues. But leaf and stem tissues showed almost same CAM-like pattern of acid fluctuation under 8-hour days. Stem tissues of R oleracea grown under the naturai environment showed high CAM activity, but no CAM activity was seen in leaves of those plants. In the naturally growing plants, the rapid acidification was seen in intact stems at dawn, but defoliated stems showed only a gradual increase. RuBP carlboxylase activity was very high at 2:00 P.M. in both leaves and stems. However, its activity at 1:00 A.M. and 5:30 AM. was hardly detected. particularly, activity of PEP carboxylase in leaves was very high in the early morning, though that in stem tissues was little. These results indicate that $CO_2$ passed through open stomata at dawn may be assimilated by PEP carboxylase in leaves, and then $C_4$ products move to stems. The levels of nitrate concentration and of nitrate reductase were higher in stems than in leaves. The levels were also higher in the light than in the dark. It would be suggested that considerable amount of nitrate absorbed from roots ho assimilated in stems, and nitrate transferred to leaves via stem tissues be reduced there. Key words: Portalaca oleracea, Cactus, Photosynthesis, Nitrogen assimilation, Crassulacean acid metabolism (CAM).

• 한국산림과학회지
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• 제84권2호
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• pp.186-197
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• 1995

경기도 양평 지역에 생육하고 있는 리기다소나무, 낙엽송, 졸참나무 임분의 지상 부위 생체량과 엽면적을 추정하기 위해 흉고직경, 흉고단면적, 변재단면적, 변재부피 등의 변수를 이용하는 회귀식을 조제하였다. 지상 부위 생체량과 엽면적은 흉고직경, 흉고단면적, 변재단면적, 변재부피 등과 각각 통계적으로 유의한 상관 관계를 보였으며, 비슷한 직경급에서 3수종 모두 유사한 수간목부 생체량을 보였다. 그러나 수피, 잎, 가지와 지상 부위 총생체량과, 단위건중량당 엽면적 그리고 엽면적 변재단면적의 비에 있어 수종 간 차이가 뚜렷하였다. 생체량과 엽면적 추정을 위한 회귀식은 대상 수중의 잎의 습성과 수병에 영향을 받는 것으로 보이며, 이들 영향을 보다 확실하게 구명하치 위해서 상세한 연구가 필요한 것으로 사료된다.

• 한국환경과학회지
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• 제13권6호
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• pp.513-518
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• 2004

3-weeks old Commelina was transferred to and grown in Hoagland solution (Control, $100\muM$ $Cd^{2+}$, $100\muM$ $Cd^{2+}$+ $100\muM$ IAA, $100\muM$ $Cd^{2+}$+ $100\muM$ IAA + 2 mM sucrose) for 3 weeks and then the effects of indole acetic acid (IAA) on the accumulation of $Cd^{2+}$ and growth of $Cd^{2+}$-treated Commelina were investigated. In the treatment of $Cd^{2+}$, $Cd^{2+}$ was uptaked to 1.74, and 51.36 ${\mu}g/g$ frwt. at the first week, but for three weeks, 0.51 and 34,53 ${\mu}g/g$ frwt, in leaf and stem respectively. When IAA was treated along with $Cd^{2+}$, $Cd^{2+}$ was uptaked to 0.18 and 8.63 ${\mu}g/g$ fiwt, at the first week, and for the incubation of 3 weeks, 0,51 and 45.0 ${\mu}g/g$ fiwt. in leaf and stem. In case of $Cd^{2+}$+IAA+sucrose, $Cd^{2+}$ was uptaked to 1.45 and 18.33 ${\mu}g/g$ frwt. at the first week, but for 3 weeks, 0,51 and 25.45 ${\mu}g/g$ fiwt. in leaf and stem. Likewise $Cd^{2+}$ uptake, the growth was also affected by $Cd^{2+}$ and IAA. During the incubation of 3 weeks, $Cd^{2+}$ reduced the stem growth about 8% in all weeks, but the treatment of IAA recovered the inhibition of stem growth caused by $Cd^{2+}$ to the degree of the control Therefore, it could be concluded that IAA altered the pattern of $Cd^{2+}$ uptake and the growth which were supposed to change $Cd^{2+}$ toxicity.

• 농업생명과학연구
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• 제43권2호
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• pp.17-21
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• 2009

본 실험은 폐타이어칩이 심비디움 Pine Clash 'Moon Venus'의 생장 및 양분함량에 미치는 영향에 대해서 조사하였다. 잎, 줄기의 지상부 생장은폐타이어칩과 바크를 혼용한 경우에는 관행구인 바크와 차이가 없었다. 그러나 폐타이칩 단용구에서는 지상부의 생장이 현저하게 감소하였다. 총근수, 신근수, 근장 등 지하부의 생장도 지상부의 생장과 유사한 경향을 나타내었다. 부패근수는 폐타이어칩 중립과 대립의 단용구에서 증가하였다. 전당, 전분, 엽록소와 N, P, K 등 무기양분의 함량도 폐타이어칩과 바크를 혼용한 경우에는 관행구인 바크와 차이가 없었으나, 폐타이칩 단용구에서는 감소하였다.

• 생약학회지
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• 제22권4호
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• pp.249-251
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• 1991

The cytotoxic and antibacterial activities of the leaf, the stem and the seed extracts of Luffa cylindrica were evaluated against L1210 cells and Streptococcus mutans OMZ176, respectively. Among hexane, ether, butanol and water fractions, the ether fraction demonstrated the most potent cytotoxic activity, and the $ED_{50}$ values of the ether extract from the leaf, the stem and the seed were 3.5, 3.7 and $13.7{\mu}g/ml$, respectively. Meanwhile, the other fractions showed negligible effect. Separately, it was found that the antibacterial activity of the respective fraction from three parts was insignificant.

• 한국약용작물학회지
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• 제11권4호
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• pp.284-288
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• 2003

This study was conducted to classify photosynthesis rate and changes of rutin content of Korean buckwheat (cv. Chunchon-jaerae and Yangjeul-memil) treated with salinity, UV-C and low temperature. In case of cv. Chunchon-jaerae and Yangjeul-memil, according to the salt stress, transpiration rate, stomatal conductance and photosynthesis rate were decreased. Both cultivars also showed decrease of transpiration rate and photosynthesis rate under the UV-C. Rutin contents within leaf and stem of cv. Yangjeul-memil were decreased when NaCl concentration was high. Rutin contents within leaf and stem of cv. Yangjeul-memil were generally decreased when the time laps under the UV-C stress. Rutin contents within leaf and stem of cv. Chunchon-jaerae was also generally decreased when the time laps under the low temperature stress.

• Plant Resources
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• 제7권3호
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• pp.233-237
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• 2004

This study was conducted to develop effective production system in greenhouse for leaves and stems of Angelica acutiloba by using connect pots in 2003 and 2004. Seed germination rate and plant biomass of Angelica acutiloba collected in 2004 were higher than those harvested in 2003. Germination rate of Angelica acutiloba seeds collected in 2003 was 10％, while germination rate of seeds collected in 2004 was above 90％. Especially, plant growth and yield of Angelica acutiloba grown in connect pots sized with 4 ${\times}$ 4 ${\times}$ 5cm(length ${\times}$ width ${\times}$ height) were the highest. These results indicate that leaf and stem production of Angelica acutiloba can be improved by using connect pots and optimizing seed collecting time in greenhouse.

• 한국작물학회지
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• 제45권2호
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• pp.88-92
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• 2000

Excessive soil water in paddy field induces growth losses during the vegetative stages of soybean plants. Our objectives were to know growth responses of soybean as affected by the level of ridge heights. A field experiment was conducted at the Research Farm of Korea University near Seoul in 1996. Ten cultivars of soybean (Glycine max (L.) Merrill) were planted at the ridge heights of 10, 30, and 50cm in paddy soil on 27 June. Total dry matter accumulation at the 10cm ridge height was severely decreased until the growth stage of R5 as compared to the ridge heights of 30 and 50cm, and this decrement was mainly due to both reduced leaf and stem dry weights. However, seed dry weight was not significantly decreased at the lower ridge height with the increment of harvest index. Cultivar differences were found on seed dry weight, crop growth rate from R1 to R5, and leaf/stem ratio of R5. From the above results, soybean growth responses to excessive soil water in paddy field were different between seed filling stage and late vegetative to early reproductive growth stages.

• Journal of Ginseng Research
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• 제7권2호
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• pp.108-114
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• 1983

1. To know the site of saponin synthesis in this plant, 4-years old Panax ginseng C.A. Meyer was administered with 1, 2-l4C-acetate (Na salt, 10 ucilplant) by stem injection and was continued to grow for 3 weeks and the distribution of the radioactivity in leaf, stem and root part was identified. The percentage of radioactivity recovered was about 3.99%. 2. The sliced roots or leaf discs (2g) were bathed in the reaction mixture containing sugar, ATP, NADPH, and the distribution of the radioactivity of the fractions (sugar, saponin, sapogenin) was identified. 3. It seemed that major synthesized saponins in roots and leaves are dial and triol-type, respectively. Although both types of saponins are synthesized in roots, the main saponins seemed to be dial saponins and a significant portion of triol saponins are supplied from leaves through stem.