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오순자,고정군,고석찬 한국자원식물학회 2001 한국자원식물학회지 Vol.14 No.1
한라산 백록담내의 고산식물 59종류를 대상으로 생활형, 화색, 개화시기, 그리고 종자의 성숙시기 등을 조사하여 화훼자원으로의 개발가능성을 조사하였다. 백록담내 고산식물의 생활형은 반지중식물이 67.8%로 대부분을 차지하여 전형적인 고산식물의 생활형 분포를 보여주고 있다. 개화는 전반적으로 7∼8월에 이루어지며, 종자는 8∼9월에 집중적으로 성숙되는 것으로 확인되었다. 한편 고산식물의 화색은 백색이 27% (16종)로 가장 많고, 백색, 청색, 황색 꽃의 출현빈도가 대체로 높게 나타났다. Life form, flower color, flowering and seed-ripening seasons of 59 alpine plants in Paeknokdam, the crater of Mt. Halla, were investigated in order to obtain the information about ornamental potentials of alpine plants. Life form spectrum of alpine plants are characterized by a high percentage of hemicryptophytes (67.8%). This result was similar to those of other alpine plant communities. Flowering season of alpine plants was July to August and seed-ripening season was August to September. Flower color of these alpine plants was dominated by white (27%), blue (22%) and yellow (20.3%).
저온스트레스 지표 선발을 위한 아열대성 식물 4종의 O-J-I-P곡선 분석
오순자,고석찬 한국환경과학회 2005 한국환경과학회지 Vol.14 No.4
The changes of O-J-I-P transients were investigated using leaves of four subtropical plant species (Crinum asiaticum var. japonicum, Osmanthus insularis. Chloranthus glaber and .4splenium antiquum) under the natural conditions in winter.. in order to select the stress indicators for diagnosing physiological states of plants under low temperature. In the O-J-I-P transients of these species, the fluorescence intensity was found to be higher in O-step and lower in P-step in winter than in summer. Particularly, the fluorescence intensity of the P-step in Crinum asiaticum var. japonicum was lower than those of other three plant species, indicating that Crinum asiaticum var. japonicum is the most sensitive to low temperature. Of the chlorophyll fluorescence parameters derived from O-J-1-P transients of four subtropical plants, Fm, Fv/Fo, ABS/CS. TRo/CS, Φ_(PO) and Φ_(PO)/(1-ΦP(PO) decreased significantly with the increase of Fo, Sm. N, ETo/CS. ETo/RC and Ψo/(1-Ψo) depending on temperature drop in winter. Therefore. these parameters could be used as indicators for estimating low temperature stress and diagnosing physiological states of plants under the natural conditions in winter.
겨울철 저온스트레스에 의한 문주란의 광합성효율과 psbA 유전자의 발현양상
오순자,고석찬 한국환경과학회 2004 한국환경과학회지 Vol.13 No.4
The change of chlorophyll fluorescence parameters, O-J-I-P transients and psbA gene expression were investigated in the leaves of Crinum asiaticum var. japonicum on the natural condition in winter, in order to elucidate physiological responses of photosystem Ⅱ (PSⅡ) activity to winter stresses. The photochemical efficiencies of PS Ⅱ, Fv/Fm, were significantly low in winter, contrary to its high value in summer. The values of 1-qN and 1-qP were lower in midday than at dawn or night both in summer and winter, although their decrease in midday was less in winter than in summer. In the O-J-1-P transients, the fluorescence intensity of J, I, P-step decreased remarkably depending on temperature drop in winter. And the D1 reaction center protein of PSⅡ decreased in late winter more than in early winter, concomitantly with relatively high content of description products of psbA gene in midday. These results indicate that low temperature in winter causes irreversible damage to PSⅡ and subsequently leads to cell death.
제주지역 주요 활엽수의 대기 중 CO<sub>2</sub> 흡수율과 수분이용효율의 계절적 변화
오순자,김현철,강희석,신창훈,고석찬,Oh, Soonja,Kim, Hyoun-Chol,Kang, Hee-Suk,Shin, Chang-Hoon,Koh, Seok Chan 한국환경과학회 2020 한국환경과학회지 Vol.29 No.2
Seasonal changes in the CO<sub>2</sub> fixation rate and water-use efficiency in the leaves of six evergreen and two deciduous broad-leaved tree species on Jeju Island, Korea, were measured using a portable photosynthesis analyzer, to identify which species are most efficient in taking up CO<sub>2</sub> from the air. The CO<sub>2</sub> fixation rate was high in the deciduous species in spring and summer and decreased in fall, whereas it was high in the evergreen species in summer and fall and decreased in winter. The rate remained high in the deciduous tree Prunus yedoensis from spring to fall (> 7.1 μmol CO<sub>2</sub>/m<sub>2</sub>/s) and in two evergreen trees, Castanopsis cuspidata var. sieboldii and Cinnamomum camphora, in summer and fall (7.0 9.9 μmol CO<sub>2</sub>/㎡/s). Therefore, these tree species fix atmospheric CO<sub>2</sub> effectively. The water-use efficiency was higher in evergreen species than in deciduous species regardless of the season. Exceptionally, it was high in the deciduous species Zelkova serrata in spring and summer (> 100 μmol CO<sub>2</sub>/mol H<sub>2</sub>O), suggesting that Z. serrata is a useful tree for dry conditions due to its tolerance of water stress. The regressions of the CO<sub>2</sub> fixation rate versus the evaporation rate and stomatal conductance were linear and non-linear, respectively. This suggests that the stomatal activity of leaves plays an important part in CO<sub>2</sub> fixation of plants. In conclusion, C. cuspidata var. sieboldii, C. camphora, and P. yedoensis should be planted along roads or in urban spaces for the greening of cities and mitigation of CO<sub>2</sub> concentrations in the air.
제주도에 자생하는 피자식물의 항산화활성과 α-amylase 저해활성 검색
오순자,고석찬 한국자원식물학회 2009 한국자원식물학회지 Vol.22 No.1
Antioxidative activity and α-amylase inhibitory activity were investigated in the methanol extracts of 289 species of angiosperm plants native to Jeju Island in order to select the plant species containing bioactive materials for functional foods or medicines. The antioxidative activity, estimated by the DPPH radical scavenging capacity, was high in the galla of Rhus chinensis, the fruit of Platycarya strobilacea, and the stem of Cedrela sinensis. Particularly, the antioxidative activity of Rhus chinensis galla (94.2±0.8%) was very high even though compared to those of BHA (61.7±0.6%) and ascorbic acid (53.6±0.7%). The α-amylase inhibitory activity was 80% or above in 9 species including Cornus macrophylla (stem, leaf), Distylium racemosum (leaf) and Vaccinium oldhami (leaf). These results suggest that these plants could be potentially utilizable to develop bioactive materials for functional foods or medicines. 제주도에 자생하는 피자식물 289종 454점을 대상으로 항산화활성과 α-amylase 저해활성을 검색하였다. DPPH radical에 대한 전자공여능으로 측정한 항산화활성은 붉나무의 오배자, 굴피나무의 열매, 참죽나무의 줄기 메탄올 조추출물에서 높은 활성을 보였다. 특히, 붉나무의 오배자의 항산화활성은 94.2±0.8%로 본 실험에 동일 농도의 대조구로 사용된 BHA(61.7±0.6%)와 ascorbic acid(53.6±0.7%) 보다도 활성이 높았다. 그리고 붉나무, 굴피나무, 참죽나무 이외의 나머지 52점의 식물들도 차나무 잎의 활성보다 높았다. α-Amylase 저해활성은 곰의말채의 줄기와 잎, 조록나무의 잎과 소지, 정금나무의 잎 등 9종 11점에서 80% 이상의 높은 활성을 보였다. 앞으로 식품 소재 또는 생약으로의 개발 가능성을 모색하기 위해서 활성성분의 분리 및 동정 그리고 이들 물질을 이용한 임상실험 등 보다 심도있는 연구가 요구된다.