• 생물환경조절학회지
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• 제30권1호
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• pp.46-55
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• 2021

시설 토양 오이재배에서 토양수분장력계를 이용하여 관수 제어하였을 때 오이의 광합성 형광반응, 수액 흐름, 엽온 등에 미치는 영향을 구명하고자 실험을 수행하였다. 오이(Cucumis sativus L.)'청춘'(해오름 종묘)을 공시하여 관수개시점 10-10-20kPa 또는 20-10-10kPa의 2처리하였다. 766 ~ 854 W·m-2의 고광, 32℃ 이상의 고온인 처리 66일 째 광합성형광반응변수(Fo, Fm, Fv/Fm)값은 처리 간 차이가 컸다. 66일 째 낮 시간(오전 10시 반 ~ 오후 6시)의 Fo와 Fv/Fm값은 10-10-20kPa 처리보다 20-10-10kPa 처리에서 높았다. 엽온이 높았을 때 Fv/Fm값은 감소하였다. 28일과 66일째 엽 생육(엽장, 엽폭, 엽면적)은 차이가 없었으나 엽록소 함량(SPAD 값)은 20-10-10kPa 처리에서 유의하게 높았다. 광도와 온도가 증가함에 따라 줄기수액흐름상대율(SFRR)과 엽온은 상승하였다. 두 처리구 모두SFRR은 광도 170 W·m-2 이상인 오전 8시 ~ 9시간대에 급격한 증가가 시작되었다. 관수 후의 처리구 토양 온도는 감소하였으나, 7월 5일(광도 820W·m-2, 오후 1시) 토양 온도가 10-10-20kPa에서는 31.0℃, 20-10-10kPa에서는 28.5℃였다. 그러나 처리 간 SFRR, 엽온, 기온차, VPD는 차이가 없었다. SFRR과 엽온 간에는 정의 상관성(p < 0.01, r = 0.770)을 보였으며, SFRR과 엽온은 광, 온도, 토양 온도, 토양수분함량, VPD 간에는 정의 상관을 상대습도와 기온차 간에는 부의 상관을 보였다.

• 원예과학기술지
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• 제19권2호
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• pp.153-158
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• 2001

세인트폴리아(Saintpaulia ionanth)의 잎에는 노랑 또는 갈색의 반점이 많이 생긴다. 이러한 반점은 leaf spot라고 불리며 관수시엽온이 급격히 떨어지는 쇼크(Temperature Drop Shock: TDS)에 기인하는 것으로 알려져 있다. TDS에 의해 발생하는 leaf spot에 대해서는 세인트폴리아 외에는 지금까지 발표된 바 없다. 본 연구에서는 이러한 엽상해가 어떤 종류의 식물에서 발생하는지 알아보기 위해, 세인트폴리아가 속해 있는 Gesneriaceae과 식물을 중심으로 조사하였다. 그 결과, Gesneriaceae과 식물에서는 Gloxinia 등 10속, 26종의 식물에서 leaf spot가 발생하였으며, Acanthaceae과 식물에서는 7속, 8종의 식물에서 발생하였다. Leaf spot이 발생하는 식물들의 잎에서는 어떠한 형태적, 해부학적 유사성이 발견되지 않았다. 어떤 식물의 잎은 두껍고 단단한 반면, 어떤 식물의 잎은 얇고 부드러웠다. 그러나 leaf spot이 발생한 모든 식물들에 있어 TDS에 의한 상해는 책상조직세포에만 발생하였고, 엽록소형광도 TDS 처리 직후 급격히 감소하여 회복되지 않는 등, 세인트폴리아에서의 leaf spot과 동일한 현상을 보였다. 이러한 결과들로부터 TDS에 의해 발생하는 엽상해는 세인트폴리아만이 아니라 좀더 넓은 범위의 식물에서 발생된다는 사실이 명확해졌다.

• The Plant Pathology Journal
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• 제20권1호
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• pp.67-74
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• 2004

A complete understanding of the epidemiological factors required for optimum for disease development facilitates the design of effective and reliable screening techniques and also disease prediction models. An attempt was made to study the effects of different temperatures ($15-35^{\circ}C$) and leaf wetness periods (4-24 h) on the development of late leaf spot (LLS) in three groundnut genotypes differing in their susceptibility to LLS infection. Irrespective of the genotype, the disease progress evaluated based on different components of resistance was maximum between $15-20^{\circ}C$ and minimum between $20-25^{\circ}C$. At temperatures $\geq$$30^{\circ}C$, LLS development was insignificant. The overall severity of LLS increased with an increase in the leaf wetness period from 4 h to 12 h a day. Further increase of wetness period to 16 h resulted in a rapid increase in the severity. Thereafter, the disease severity gradually decreased with an increase in the wetness period. The effect of temperature and wetness periods on the individual component of disease quantification was not uniform compared between genotypes with different levels of susceptibility/resistance to LLS infection. The results of this study indicate that temperature and leaf wetness period are critical in late leaf spot screening programs since the expression of disease symptoms measured from disease initiation till defoliation, varied differently in the test genotypes with respect to change in these two parameters.

• 한국식품저장유통학회지
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• 제14권4호
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• pp.345-350
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• 2007

상추를 포장하여 품종('적치마', '청치마', '적축면', '청축면')과 저장온도(0, 8, 16 및 $24^{\circ}C$)에 따른 저장성을 구명하고자 중량 감소율, 호흡률, 선도, 색소함량 및 색상차 등을 조사하였다. 저장온도 조건에 따라 품종별 차이를 달리 보여, 저온($0^{\circ}C$)에서는 중량감소 정도 및 선도, 호흡률 등에 의한 품종별 차이가 크지 않았으나, 저장 온도가 높아지면서 변화 정도와 차이가 커졌다. 중량감소 및 선도 변화에 있어서는 저온 저장 온도인 $0^{\circ}C$에서는 30일간 저장하여도 품종간의 차이가 크지 않았으나, 상추의 유통과정에서 조우 할 수 있는 온도 범위인 $8^{\circ}C$에서는 저장기간이 짧아지면서 품종에 따른 변화 정도가 인정되었으며, $24^{\circ}C$와 같은 높은 온도에서는 저장기간이 짧았음에도 불구하고 품종에 따른 중량 감소 정도에 차이를 보였다. 호흡률 또한 온도가 높아짐에 따라 증가하면서 품종에 따른 차이가 커졌으며 이는 색소함량 등에서도 같은 경향을 보였다. 이는 온도가 높은 저장 조건에서는 품종과 같은 내재된 요인에 의해 저장성의 차이를 보이지만 저장온도가 낮으면 이러한 요인이 억제되어 저장성의 차이가 발현되지 않은 것으로 생각된다.

• Applied Microscopy
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• 제43권3호
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• pp.110-116
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• 2013

Effects of elevated air temperature and carbon dioxide ($CO_2$) concentration on the leaf surface structures were investigated in Liriodendron tulipifera (yellow poplar) and Populus tomentiglandulosa (Suwon poplar). Cuttings of the two tree species were exposed to elevated air temperatures at $27/22^{\circ}C$ (day/night) and $CO_2$ concentrations at 770/790 ppm for three months. The abaxial leaf surface of yellow poplar under an ambient condition ($22/17^{\circ}C$ and 380/400 ppm) had stomata and epicuticular waxes (transversely ridged rodlets). A prominent increase in the density of epicuticular waxes was found on the leaves under the elevated condition. Meanwhile, the abaxial leaf surface of Suwon poplar under an ambient condition was covered with long trichomes. The leaves under the elevated condition possessed a higher amount of long trichomes than those under the ambient condition. These results suggest that the two poplar species may change their leaf surface structures under the elevated air temperature and $CO_2$ concentration condition for acclimation of increased photosynthesis.

• 생물환경조절학회지
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• 제17권1호
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• pp.14-19
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• 2008

저온기의 딸기 재배를 위한 기초자료를 얻기 위하여 '아키히메(章姬)'품종을 재료로 딸기의 뿌리 발달에 미치는 저온의 영향과 지하부의 온도와 관련된 지상부의 생육을 조사하였다. $18^{\circ}C$의 근온처리구에서 1차근의 생육이 가장 양호하였으며 $8^{\circ}C$의 저온에서 뿌리의 신장률이 가장 낮았으며, 특히 측근의 수와 길이가 가장 저조하였다. 근부의 온도는 지상부의 생육에도 직접적인 영향을 미쳐서, 낮은 근권 온도에서는 지상부의 생체중, 엽면적, 엽장, 엽폭 및 엽수의 저하를 초래하였다. 본 실험의 결과는 지하부 온도관리의 중요성을 확인할 수 있는 것으로 딸기 촉성재배농가에 유용한 정보로 활용될 수 있을 것이다.

• 한국태양에너지학회 논문집
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• 제36권2호
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• pp.1-7
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• 2016

This study was experimentally performed to analyze the growth characteristics of a plant(wax tree or privet) using the surface temperature measured from thermal images captured using a thermal camera with water and cider. To do that, this study measured every each 12 hours the surface temperature and the stem temperature of leaves attached to the plant sample until the plants wilt on summer season in the laboratory room. From the experimental results, this study revealed that the temperature of front and back of the leaves is a little different due to the pore. The mean surface temperature of a leaf in cider is $0.52^{\circ}C$ higher than that of a leaf in water. The phenomena that the leaves of plants fall could be also demonstrated using the surface temperature. Before a leaf is falling from the tree, the temperature of the stem is lowered about $2^{\circ}C$ than those of other parts in a leaf. This result can be validated from previous result performed in University of Wisconsin.

• Journal of Ecology and Environment
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• 제46권3호
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• pp.161-171
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• 2022

Background: Epilobium hirsutum L. is designated as an endangered plant in South Korea located in Asia, due to the destruction of its habitats through the development of wetlands. Therefore, in this study, in order to find a light condition suitable for the growth and ecophysiological responses of Epilobium hirsutum L., those of this plant under treatment with various light qualities in a smart farm were measured. Results: In order to examine the changes in the physiological and growth responses of Epilobium hirsutum L. according to the light qualities, the treatment with light qualities of the smart farm was carried out using the red light: blue light irradiation time ratios of 1:1, 1:1/2, and 1:1/5 and a red light: blue light: white light irradiation time ratio of 1:1:1. As a result, the ecophysiological responses (difference between leaf temperature and atmospheric temperature, transpiration rate, net photosynthetic rate, intercellular CO₂ partial pressure, photosynthetic quantum efficiency) to light qualities appeared differently according to the treatments with light qualities. The increase in the blue light ratio increased the difference between the leaf temperature and the atmospheric temperature and the photosynthetic quantum efficiency and decreased the transpiration rate and the intercellular CO₂ partial pressure. On the other hand, the white light treatment increased the transpiration rate and intercellular CO₂ partial pressure and decreased the temperature difference between the leaf temperature and the ambient temperature and photosynthetic quantum efficiency. Conclusions: The light condition suitable for the propagation by the stolons, which are the propagules of Epilobium hirsutum L., in the smart farm, is red, blue and white mixed light with high net photosynthetic rates and low difference between leaf temperature and atmospheric temperature.

• 한국의류학회지
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• 제28권3_4호
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• pp.444-451
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• 2004

This study was carried out to investigate the chemical and dyeing properties of Petasites japonicus leaf extract under the various extracting and dyeing conditions such as temperature, time, the ratio of water and pH, repetition of dyeing in silk and cotton fabrics with Petasites japonicus leaf. The results were as follows: 1. It was found that λ$_{\max}$ of color solution extracted by Petasites japonicus leaf has two peaks at 290nm and 323nm. 2. The optimum extracting conditions were studied at 10$0^{\circ}C$, 40min., pH 7 and 1 : 20(the ratio of water and Petasites japonicus leaf), the optimum dyeing temperature, dyeing time, dyeing pH and repetition of dyeing were 10$0^{\circ}C$, 60min., pH 7, repetitions of three times, respectively. 3. Silk and cotton fabrics dyed with Petasites japonicus leaf extract were colored yellowish orange. The colory Petasites japonicus leaf extract in silk and cotton fabrics were deeped by same-mordanting with aluminum potassium sufate and cupric sulfate. 4. Washing fastness of silk fabrics was 4∼5 grade, but cotton fabrics was 3∼4 grade, so washing fastness of silk fabrics washed with neutral detergent was excellent.

• 한국초지조사료학회지
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• 제7권3호
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• pp.146-152
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• 1987

Sorghum cv. Pioneer 93 1, sorghum-sudangrass hybrid cv. Sioux and maize plant cv. Blizzard were assayed for toxic concentrations of nitrate-nitrogen ($NO_3$-N) and their relationship to morphological characteristics and environmental temperature in a field and phytotron trial. In the phytotron, sorghum and maize plants ranging from emergence to heading stage, were grown under different day/night temperatures of 30125, 25/20,28/18 and 1818 degree C. Nitrate-nitrogen in sorghum and maize plants was accumulated mainly in stems. Therefore nitrate concentration in the young plants was increased as development of stalks advanced and was highest at the stage of 3-4 leaves, when the plants had a leaf weight ratio 0.78-0.80 g/g plant weight. However, nitrate concentrations of the plant decreased as morphological development progressed, especially from the stage of growing point differentiation. Correlation coefficients showed a positive correlation of nitrate concentration with leaf weight ratio, leaf area ratio and specific leaf area, while plant height, dry matter percentage and absolute growth rate showed a negative association with TEX>$NO_3$-N ($P{\le}0.1$%). Cyanogenic glycosides, total nitrogen and crude protein were close associated with nitrate accumulation, and positively significant ($P{\le}0.1$%). High temperature over 30/25^{\circ}C.$ for 3 weeks increased N-uptake and dry matter accumulation, but reduced nitrate concentration. Under cold temperature below 18/8^{\circ}C.$ concentration of nitrate-N was increased in spite of its limited nitrogen uptake and plant growth.