• The Plant Pathology Journal
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• 제21권3호
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• pp.293-296
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• 2005

A leaf blight caused by a species of Phytophthora was found on fatsia plants (Fatsia japonica Decne et Planch.) growing in an apartment garden in Daegu, Korea in late April to May, 2003. The species of Phytophthora isolated from the diseased plants produced sporangia and sex organs on V8 juice agar medium. Sporangia were papillate, ovoid to subspherical, and caducous with a pedicel. The dimensions of the sporangia were $31.2-46.8\times23.4-33.2{\mu}m$ in range, $39.6\pm4.1\times28.3\pm2.8{\mu}m$ in $average{\pm}standard$ deviation, I/b ratio approximately 1.40, with papillae about $3.6{\mu}m$ high, and pedicels $0.9­5.8{\mu}m$ long. Oogonia were spherical, $25.0-32.5{\mu}m$ in range with an average of $28.2\pm2.3{\mu}m$ in diameter. Antheridia were predominantly paragynous, globose to ovoid, $8.8-13.8\times7.5-10.0{\mu}m$ with an average of $10.9\pm1.2 \times9.2\pm1.1{\mu}m$. Oospores in the oogonia were aplerotic or plerotic, and $20.0-25.0{\mu}m$ in diameter with an average of $23.5\pm1.5{\mu}m$. Pathogenicity of the isolate was confirmed on detached leaves of fatsia. The disease was observed only in April and May of 2003 when the weather was unusually wet. It then diminished with increase of temperature in the year and did not appear again on the same plants in 2004. Thus, the fungus appeared to be a relatively weak pathogen of fatsia.

• Journal of Plant Biotechnology
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• 제30권1호
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• pp.41-45
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• 2003

Iris 속 식물인 꽃창포의 번식 특성에서 종자의 잡종성과 적은 분얼로 인한 분주 번식의 어려움을 해결하고 고유한 품종의 특성을 유지하기 위해서는 조직배양을 통한 대량 번식의 구명이 필요하므로 Iris 속 식물의 화기부위 별 절편체를 이용하여 기내 번식에 의한 대량 증식방법을 정립하고자 본 실험을 수행하였다. 자생꽃창포의 화피기부조직, 자방, 소화경, 화경을 치상하여 기내배양환경에 적절한 환경을 구명하고자 조도 2000 Lux에서 일장 (0~24시간), 온도 (10~3$0^{\circ}C$), sucrose (l~9%)의 조건에서 배양하였다. 자생꽃창포의 화기 절편체로부터 유식물체 재분화에 적합한 일장은 16시간의 장일조건이, 온도 조건은 $25^{\circ}C$에서, sucrose 농도는 3%에서 가장 적합한 것으로 나타났으며 특히 화기 부위 중 화피기부조직과 자방 배양에서 높은 신초 형성을 보였다. 화기조직 치상절편체로부터 부정근의 분화는 암상태에서 촉진되어지고 sucrose는 6%에서 뿌리를 생장시키며 1$0^{\circ}C$, 15$^{\circ}C$의 저온에서는 신초,뿌리의 분화가 저조하였다.

• 식물조직배양학회지
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• 제24권6호
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• pp.319-322
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• 1997

벼의 미수분자방배양에서도 저온처리의 효과가 인정되어 $12^{\circ}C$에 10일동안 전처리된 자방배양에서 캘러스형성률과 식물체 재분화율이 각각 10.7%와 38.7%로 가장 높게 나타났다. 액체배지에서 보다 6 g/L의 gelrite를 첨가한 고체배지에 자방을 배양하였을 때 식물체 재분화율이 높게 나타났다. 미수분 자방을 1 mg/L의 picloram이 첨가된 배지에 배양하였을 때 녹색체 분화율이 가장 높았고, picloram의 농도가 그 이상 증가함에 따라 백색체의 출현빈도가 높아지는 경향이었다. 저온처리된 이삭으로부터 자방만 분리하여 배양하였을때는 캘러스가 형성되지 않았으나 내외영의 일부와 자방 및 소지경이 2차지경에 부착된 상태로 배양하였을때 캘러스 형성률과 식물체 재분화율이 각각 9.4%와 39.3%로 가장 높게 나타났다.

• Applied Microscopy
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• 제31권1호
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• pp.91-99
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• 2001

무당벌레(Harmonia axyridis)성충 더듬이에 분포하는 감각기를 주사전자현미경으로 관찰하였다. 무당벌레 성충 더듬이에서 형태적으로 크게 차이를 보이는 5종류의 감각기, $B\ddot{o}hm$, Basiconic, Chetiform, Trichoid 그리고 Coeloconic sensilla를 관찰할 수 있었다. $B\ddot{o}hm$ sensilla는 자루마디와 팔굽마디 기부안쪽의 등쪽면과 배쪽면에서만 관찰되었고, 이것은 분포된 위치로 미루어 더듬이의 움직임과 위치를 확인하는 자기반응감응성 감각기로 보여진다. Basiconic sensilla와 Chetiform sensilla는 형태적 차이에 의하여 3가지 subtype으로 나눌 수 있었으며, Trichoid sensilla는 암 수컷 더듬이 모두에서 더듬이 말단의 2마디에서만 확인되었다. 무당벌레 성충 더듬이에서 관찰된 sexual dimorphism은 더듬이 감각기의 분포와 종류가 있었는데 이것은 암컷과 수컷간의 더듬이 감각기의 분포가 다르게 나타났으며, 감각기의 다양성이 가장 높게 나타난 말단마디의 배쪽면에서 관찰된 Coeloconic sensilla는 수컷에서만 관찰되었고, Trichoid sensilla의 경우 수컷보다 암컷에서 더 많이 관찰되었다. 이러한 sexual dimorphism은 동종의 성상호간 통신에 이용되는 것으로 보여진다.

• 한국응용곤충학회지
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• 제29권1호
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• pp.1-5
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• 1990

멸구류 알기생봉인 Anagrus incarnotus Haliday의 알, 유충, 용, 성충의 각 발육단계별로 이의 형태적 특징을 관찰한 결과는 다음과 같다. A. incarnatus의 알은 sausage형으로 가늘고 긴 자루모양의 알자루가 있으며 길이는 0.215 mm, 幅은 0.057 mm였다. 1令幼蟲은 자루모양으로 마디가 없으며 중앙부위보다 머리와 꼬리부위가 좁고 蟲體 自體는 움직이지 않았다. 꼬리부위는 혹처럼 되어 있고 알껍질도 이 부위에 붙어 있었으며 길이는 0.290 mm, 폭은 0.082 mm였다. 2令幼蟲은 圓雜形의 모양으로 한 雙의 가늘고 긴 큰 턱을 갖고 있으며 "Histriobdellid" 形이었다. 길이는 0.535 mm, 폭은 0.110 mm였다. 번데기 시기는 머리, 가승, 배의 區分이 확실하였으며 더듬이와 배를 비교하여 암수의 구별이 가능하였다. 성충의 경우 암컷의 더듬이는 9마디, 숫컷은 13마디였다. 특히 암컷의 경우 끝부분이 根律形이고 첫째 채찍마디는 매우 짧고 球彩 또는 半球形이다. 3번째 채찍마디는 4번째 채찍 마디보다 약간 길고 한 개의 感覺 癸起가 있다. 앞날개의 중앙부위에는 8~9줄의 털이 散在해 있다. 體長은 암컷이 0.660 mm, 습컷은 0.650 mm였다..650 mm였다.

• 식물분류학회지
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• 제40권3호
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• pp.145-152
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• 2010

한국산 백운풀속(Oldenlandia L.) 5종에 대하여 외부형태 형질을 재검토하고, 이중 25개의 양적 형질에 대한 수리분류를 통하여 분류군간의 한계를 파악하고자 하였다. 질적 형질에서 잎의 형태, 화서, 화관 내부의 연모, 열매의 상부 팽창, 종자의 형태 등이 분류군 간의 식별형질로 가치가 있었다. 양적 형질의 주성분분석 결과, 주성분 1과 주성분 2를 축으로 하는 산포도에서 산방백운풀(O. corymbosa), 탐나풀(O. hirsuta) 및 낚시돌풀(O. strigulosa)은 뚜렷하게 구분되었으나, 형태적으로 다소 유사한 제주백운풀(O. brachypoda)과 백운풀(O. diffusa)은 다소 겹치게 나타났다. 하지만 두 종은 형태적으로도 꽃받침 열편의 형태, 소화경의 길이, 수술대 및 주두의 길이 등의 차이로 뚜렷히 구분되었다. 또한 유집분석에 의해 두 종이 다르게 유집되는 것으로 나타났다.

• 농업과학연구
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• 제47권3호
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• pp.415-424
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• 2020

This study investigated the effects of an ethylene scrubber (ES) with a micro-perforated polypropylene (MP-PP, 30 ㎛) or a high density polyethylene (MP-HDPE, 30 ㎛) film liner for the export carton packaging box in 'Campbell Early' grapes. Rachis browning was highest in the untreated group, followed by MP-PP and MP-HDPE for 14 days of simulated marketing at 20℃. The combination treatment of ES with the film liners showed a partial inhibition of the rachis browning regardless of the film liners. The effects of an alcohol releaser (AR) sachet or chlorine dioxide (CD) diffuser co-packaging were also investigated in the 'Campbell Early' grapes packed with the MP-HDPE (40 × 99 pin hole·m^-2) film liner. The CD 1 g treatment showed a very limited weight loss of 1.1%, which was significantly lower than the 4.7% of the untreated control after 14 days of simulation marketing at 20℃. The berry shatter was 0.7% for the MP-HDPE + CD 1 g treatment and 1.8% for the MP-HDPE + CD 5 g treatment on the 10th day of the simulated marketing, which was significantly lower than the 8.9% of the control. The stem browning was significant suppressed until the 10th day of the simulated marketing. In particular, the CD 1 g treatment in combination with the MP-HDPE showed a low rachis and pedicel browning index of 2.0, which is 50% and 40% lower than that of the untreated control and the MP-HDPE single treatment, respectively. In addition, the CD 1 g treatment group showed a higher decay reduction effect than the CD 5 g treatment group, which caused high concentration damage.

• 한국조경학회지
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• 제23권1호
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• pp.111-122
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• 1995

12 populatiDns of Ch indicum L. and it's variation antogenous in Tforea were selected throughout the country and their morphological characteristics were studied in this paper. The results are as follows. 1) The mean of the plant height is 97.3cm. Ch. indicunl is 76.5cm and Ch. boreale is 116. 6cm in height. The number of nodes is 58 on the average. The color of the stem is generally black-red in the case of Ch. indicum and is green for Ch. boreale. 2) The leaves of Ch. inficum are smaller In size and thicker than chose of Ch. boreale, and it has a stipule. This fact enables us to distinguish one species from the other, however, the Gyukpo-population of Ch. indicum has a large leaf, and Byunsan-population of Ch. boreale has a stipule so that the above fact is not an exact criterion on which to base one classification. 3) The size of the capitulum is 24.9mm for Ch. indicum and 15.6mm in the case of Ch. boreaje so that the difference between species is admitted. It was confirmed hat the size of the capitulum has positive correlation to that of the pedicel and has egative correlation to the number of flowers, so that of inflorescence, Ch. indicumhas corymb, and Ch. boreale has crowed corymb or umbel-type.The number of ligulates is 19 on the average, which no the difference being founnd between species and populations.4) The cluster analysis of morphological characteristics showed that Ch. indicum wasdivided into two groups, which was shown thought to be due to the difference of speciesbetween Ch. indicum and Ch. boreale. However, it could not be shown that their morphological characteristics explain a geographical relationship between populations

• Journal of Korean Neurosurgical Society
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• 제56권3호
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• pp.230-236
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• 2014

Objective : The technique of short segment pedicle screw fixation (SSPSF) has been widely used for stabilization in thoracolumbar burst fractures (TLBFs), but some studies reported high rate of kyphosis recurrence or hardware failure. This study was to evaluate the results of SSPSF including fractured level and to find the risk factors concerned with the kyphosis recurrence in TLBFs. Methods : This study included 42 patients, including 25 males and 17 females, who underwent SSPSF for stabilization of TLBFs between January 2003 and December 2010. For radiologic assessments, Cobb angle (CA), vertebral wedge angle (VWA), vertebral body compression ratio (VBCR), and difference between VWA and Cobb angle (DbVC) were measured. The relationships between kyphosis recurrence and radiologic parameters or demographic features were investigated. Frankel classification and low back outcome score (LBOS) were used for assessment of clinical outcomes. Results : The mean follow-up period was 38.6 months. CA, VWA, and VBCR were improved after SSPSF, and these parameters were well maintained at the final follow-up with minimal degree of correction loss. Kyphosis recurrence showed a significant increase in patients with Denis burst type A, load-sharing classification (LSC) score >6 or DbVC >6 (p<0.05). There were no patients who worsened to clinical outcome, and there was no significant correlation between kyphosis recurrence and clinical outcome in this series. Conclusion : SSPSF including the fractured vertebra is an effective surgical method for restoration and maintenance of vertebral column stability in TLBFs. However, kyphosis recurrence was significantly associated with Denis burst type A fracture, LSC score >6, or DbVC >6.

• 식물분류학회지
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• 제53권1호
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• pp.1-8
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• 2023

Sustainable habitats play a significant role in determining the survival and habitat preservation of endangered species. To conserve the endangered species Iris dichotoma Pall. and its habitat in Taeanhaean National Park, we collected seeds from a natural population and germinated and propagated them in a greenhouse. In 2019, the propagated individuals of I. dichotoma were transplanted at two study sites in Taeanhaean National Park. After conservation translocation, annual monitoring was conducted from 2020 to 2022, and factors related to the survival and growth of I. dichotoma (clonal propagation rate [%], the flowering rate [%], the population density [individual/m²], the maximum leaf bundle length [height; cm], the maximum leaf bundle width [cm], and the pedicel length [cm]) were measured. According to the results of the monitoring of the flowering and fruiting periods for three years after transplantation, 82.4% of individuals in total were found to have survived. During 2020 to 2022, the mean population density (individual/m²) increased from 0.36 to 0.42 and the size of the leaf bundle length and the width both decreased compared to the corresponding figures in 2019 (p < 0.05). According to the findings here, the transplanted population of I. dichotoma is considered to have adapted successfully to its new site in Taeanhaean National Park.