• The Korean Journal of Ecology
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• 제26권4호
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• pp.165-172
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• 2003

The objectives of this study were to examine the physiological responses to ozone and to measure ozone uptake rates of Betula species exposed to relatively high concentration of pollutants. At the end of the growing season, photosynthesis, pigments contents, antioxidants (SOD and GR) and ozone uptake rates were measured or estimated at the leaves of five Betula species (Betula costata, B. davurica, B. platyphylla var. japonica, B. schmidtii and B. ermanii) exposed to 100ppb ozone concentration. On the termination of the experiment, growth effects were determined by measuring leaf area and dry weights of leaf, stem and root. Ozone treatment showed the significant reduction the leaf area and dry weight of four Betula species, except for B. ermanii. Shoot / root (SR) ratio of five species represented two different types. SR ratio of B. costata and B. davurica were lower than control, in contrast, SR ratio of B. platyphylla var. japonica, B. schimidtii and B. emani, were higher than that of control. The photosynthetic responses of five species were different in responses to ozone exposure. Four species, except for B. emanii, maintained or increased the stomatal conductance, but B. emanii decreased both stomatal conductance and photosynthesis. SOD activities of five species decreased by the ozone exposure, especially B. ermanii showed the largest reduction, GR activities of B. platyphylla var. japonica and B. schmidtii increased, B. costata and B. emanii decreased. Instantaneous ozone uptake rate was the highest at the leaves of B. ermanii and B. costata, ozone uptake per seedling was the highest at the leaf of B. schmidtii and B. emanii. It was concluded that B. costata, B. davurica and B. platyphylla var. japonica, appeared the growth reduction and visible ozone injury, were sensitive species to ozone, and B. schmidtii with the increased antioxidant activity and B. ermanii without the growth reduction were relatively resistant species to high ozone concentration at the early growing stage.

• 동의생리병리학회지
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• 제27권4호
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• pp.391-399
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• 2013

The aim of the present study was to investigate the antioxidant efficacies between extracts of Prunus yedoensis(PY) and Betulae platyphyllae var. japonica(BP). HPLC pattern was different between barks and extract solvents. Content of total phenolic compound was the highest in ethanol extract of BP(382.201 mg/g ext.) and its content was 1.9 times higher than that from the water extract of PY. Total antioxidant efficacy also was the highest in ethanol extract of BP (292 copper reducing equivalents). Nitric oxide scavenging activity was almost 70% in ethanol extract of BP treated 200 ug/ml and it was higher than positive control(ascorbic acid). DPPH radical scavenging ability was up by 80% in all samples. ABTS cation decolorization from each barks was activated over 85% in all samples at 100 ug/ml concentration, especially, the activity was the highest (94.4%) in ethanol extract of BP. Hydrogen peroxide scavenging activities were also highest (45%) in ethanol extract of BP at 200 ug/ml concentration and were as high as positive control. Stimulation of the macrophages RAW 264.7 cells with lipopolysaccharide (LPS) increased intracellular ROS levels and ethanol extract of BP at 200 ug/ml concentration reduced ROS levels up to 41 %. The results indicated that the barks of PY and BP has potent antioxidant activities and ethanol extract of BP of them has the highest antioxidant activities.

• 동의생리병리학회지
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• 제25권4호
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• pp.635-640
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• 2011

Betulae Cortex of Betula platyphylla Suk. var. japonica Hara (Betulaceae) has long been used for treatment of various inflammation, fever and cough in Eastern Asia. In order to investigate antibacterial activity of the Betulae Cortex against Streptococcus mutans or Porphyromonas gingivalis, MIC (minimal inhibitory concentration) and pH were checked, and for anti-inflammation activity, the experiments about trypsin-induced paw edema, vascular permeability and myeloperoxidase activity in rat's hind-paw tissue, were carried out with various extracts of Betulae Cortex (BCXs) respectively. The BCXs showed significant antibacterial activity, and at the dose of over 50 mg/kg, BCX showed significant inhibition on the paw edema, vascular permeability and myeloperoxidase activity. These results indicate that BCXs have antibacterial activity against oral cariogenic bacteria and anti-inflammatory effect.

• 한국산림과학회지
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• 제96권6호
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• pp.693-698
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• 2007

우리나라에서 생산되고 있는 산림 수목용 비료 성분비율은 질소:인산;칼륨이 12:16:4의 1가지만 생산되고 있어, 수종별 생장특성을 고려하고 다양한 토양환경조건에 적합한 비료 성분비율의 개발이 요구되고 있다. 본 연구는 우리나라 주요 조림수종에 대한 비료의 적정 비료배합 비율을 구명하기 위하여 소나무, 낙엽송, 자작나무, 상수리나무 묘목을 대상으로 30 l의 pot에 1본씩 식재하고 여러 가지의 시비수준에 대한 생장반응을 조사하였다. 시비수준은 질소:인산:칼륨의 배합비율이 각각 2:2:1, 3:4:1, 3:8:1, 6:4:1, 3:4:2 및 무시비구(대조구)를 포함하고 있으며, 시비처리는 3년간 pot당 매년 30 g의 양을 기준으로 비료 배합비율에 따라 조제하여 시비하였다. 3년의 조사기간 동안 소나무와 낙엽송의 수고 및 근원경 생장은 3:8:1처리구에서 가장 높았으며, 3:4:1이나 2:2:1처리를 제외하고 시비처리수준 간에 생장 차이는 크지 않았다. 자작나무와 상수리나무 같은 낙엽활엽수종의 경우 수고 생장은 3:8:1 처리구, 근원경 생장은 6:4:1처리구가 타 시비처리에 비해 높은 생장 특성을 보였다. 조사된 4수종 모두 수고 및 근원경 생장은 3:8:1처리구 및 6:4:1처리구가 유의적인 높은 생장특성을 보이고 있으며, 3:4:1이나 2:2:1처리구의 경우 타 시비수준에 비해 낮은 생장특성이 있는 것으로 나타났다.