• The Korean Journal of Ecology
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• 제26권4호
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• pp.173-180
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• 2003

To clarify whether the closely related species living in the same area is a population or populations ecologically, leaf morphology, specific leaf area, and fruit and seed production were studied in the natural group of sect. Pes-gallinaceua of Corydalis of Namhansansung area from 1999 to 2000. There were 352 plants in one square meter and total eight species or varieties were identified. Of the 352 plants, the number of C. turtschaninovii was the most with 103(29.3%), and that of C. ambigua was the next with 78(22.2%), and that of C. turtschaninovii var. fumariaefolia was the smallest with 9(2.6%). In the 28 plants having spotted leaves, central leaflet did not parted or again parted. The extent of partition with the plant was various from non-parted type to perfectly two-parted type (three leaflet). Between two extreme types, there were diverse types so that this character formed a gradient. The rate of length/breadth was in the range of 0.79~2.17. This character was related to the extent of leaflet partition but did not well expressed the distinguishing trait along a species. The number and the type of serration were diverse and there was no sharp borderline among the species or varieties. Ecological properties, specific leaf area, the number of fruit per plant, and the number of seed per fruit, varied with a wide range in a species or variety but differences between species or variety were not significant. Therefore, the Corydalis group studied was regarded as a population on the three criteria: (1) possibility of interbreeding, (2) continuity of leaf morphology, (3) irrelevance between character and species, (4) similarity of several ecological properties.

• 한국자원식물학회지
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• 제8권3호
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• pp.223-235
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• 1995

조사된 금강초롱꽃과(科) 근연 분류군 4속 9분류군에 대하여 외부형태학적 형질을 재검토하고 해부학적 형질을 통하여 종간 분류 및 금강초롱꽃속(屬)이 특산속으로서 구별이 가능한가를 알아보았다. 연구결과, 외부형태에 있어서는 뿌리의 모양, 잎의 형태, 엽병의 날개 유무, 화관의 형태, 꽃받침의 형태, 엽병의 날개 유무, 화관의 형태, 꽃받침의 형태, 화서의 형태, 주두의 형태 등이 식별 형질로서 가치가 인정되었으며 해부학적 형질에서는 횡단면의 내부구조 보다는 표피의 돌출정도와 돌출 수가 종간 구별을 위한 형질로 생각되어진다. 이번 조사를 통하여 금강초롱꽃속(屬)은 외부형태 및 해부학적 형질에서 유사 분류군들과 잘 구분되어 특산속으로서 잘 지지되었으며 기존의 학자들(Fedorov, 1957; Nakai, 1952; Hong, 1983)에 의해 분류형질로 인식되어온 엽서와 화서의 형태, 화관의 형질 들이 이번 연구에서도 속, 종을 구별하는데 매우 유용한 형질로 나타났다.

• Journal of Plant Biology
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• 제34권3호
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• pp.229-238
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• 1991

The main objective of this study was to clarify the taxonomic status and the speciation mechanism of Viola albida complex in Korea. The complex includes three very closely related taxa, taxonomic ranks of which are much in dispute. These taxa in the complex are sympatric in distribution, and they are very similar in most morphological characteristics. Comparative morphological analyses revealed that they can be distinguished on the basis of leaf shape, although they show complicated patterns of variation in leaf shape. The variation of leaf shape in each taxon appeared to be maintained through developmental process, and extensive cleistogamy and vegetative reproduction in these taxa are suggested as the mechanisms maintaining the variation. Genetic variation in this complex was monomorphic in all 14 loci examined. Palynological study also showed that these taxa have the same pollen morphology. These results strongly suggested that they should be recognized as varieties of V. albida; var, albida, var. chaerophylloides, and var. takahashii. The results also suggested that some individuals that can be assigned to var. takahashii might be hybrids between var. albida and var. chaerophylloides.

• The Korean Journal of Ecology
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• 제12권3호
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• pp.133-144
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• 1989

The morphology and flowering time of two Suaeda japonica populations from different habitats, the creek and the bank of the mudflat in Sorae, were surveyed. And standard transplantation and reciprocal transplantation were carried out to determine whether their characteristics were genetically fixed or not. Also soil sample of these habitats were analyzed. The amounts of loss on ignition, maximum field capacity, total nitrogen, exchangeable calcium and potassium, and soluble phosphorus were found to be significantly different between two habitats. Leaf thickness, leaf width, leaf length, stem height number of branches, and number of seeds were significantly different between plants of two populations. And flowering times of two populations did not overlap. According to the results of transplantation, leaf width, leaf thickness, and flowering times were the same as those at their original habitat. But the stem lenght, leaf lenght, number of branches and unmber of seeds were not. Therefore, the differences in the leaf length, leaf thickness, and flowering time seemed to bo genetically fixed. It were suggested that the creek bank populations of Suaeda japoinica were to be considered as different ecotypes.

• 한국작물학회지
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• 제36권6호
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• pp.560-567
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• 1991

콩잎의 광합성능력이 잎의 내부형태 변이와 관련되어 있는지 검토하기 위해 대두품종 ‘Hodg-son 78’을 공시하여 포장실험을 수행하였다. 잎의 내부 형태면이를 촉진시키기 위해 착협시(R3 stage)에 유아주기 (1m이랑당 26주에서 6.5주)와 곁가지 치기를 통해 source활성 증대를, 계속적인 꼬투리 제거 (절위당 한개의 꼬투리만 남김)를 통해 sink활성 감소를 시도하였다. 협신장기(R4 stage)로부터 3-4일 간격으로 5회에 걸쳐 제 10절위 복엽의 중앙소엽을 대상으로 기체교환특성, 잎의 두께, 엽육세포의 체적 및 표면적, 그리고 주변 미기상변수를 측정하였다. 가설검증을 위해 기존의 광합성모형을 엽육세포의 표면적이 기체확산과, 엽육세포의 체적이 생화학적 활성과 관련되도록 수정하였다. 실측 광합성속도의 변이가운데 79%는 이 수정된 모형에 의해 설명 가능하였으며, 엽내부형태의 영향을 무시한 기존의 광합성모형에 비해 평균 14.5%의 추정능력 향상을 확인할 수 있었다.

• 생명과학회지
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• 제17권1호
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• pp.1-5
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• 2007

쌍자엽 식물에 있어서 잎의 발달에 관한 과정은 매우 복잡하게 얽혀있지만, 이를 조절하는 메커니즘에 대해서는 아직 잘 알려져 있지 않다. 모델식물인 애기장대의 잎의 발달의 기초과정을 해명하기 위하여 잎의 형태이상 돌연변이체를 이용한 접근방법을 시도하였다. 본 연구에서 잎이 작고 가는 lanceolata1 돌연변이체를 선별하였고, 이원인유전자의 기능을 밝히기 위하여 유전학적 및 해부학적인 연구를 실시하였다. lan1-7 돌연변이체는 잎 뿐만아니라 줄기도 가늘어지는 표현형을 나타내었고, 이는 세포수준에서 세포크기와 세포수의 감소에 의한 조절되고 있음이 밝혀졌다. 이 결과는 LAN1 유전자가 잎의 발달과정에서 세포분열과 세포신장을 제어하고 있다는 사실을 시사하고 있다. lan1-7 돌연변이체와 35S-AG 형질전환체와의 F1 세대의 표현형 분석을 통하여, AG 유전자가 잎이 가늘고 위로 말리는 모양을 제어하고 있다는 사실이 판명되었다. 이 결과로 MADS-box유전자가 LAN1 유전자에 의해서 제어되고 잎의 발달과정에 관여하고 있다는 사실이 판명되었다.

• 한국자원식물학회지
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• 제11권
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• pp.117-118
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• 1998

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 1998년도 천연항암자원개발에 관한 국제학술회의 논문집 및 1998년도 한국자원식물학회 정기학술발표회 논문요약
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• pp.117-118
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• 1998

• 한국환경농학회지
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• 제13권2호
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• pp.175-182
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• 1994

색비름(Amaranthus tricolor L.) 유식물에 인공산성비 pH 2.0, 3.0, 4.0, 5.0 및 수도물(pH 6.5)을 엽면처리하여 생장, 색소 및 엽표면의 형태에 미치는 영향을 조사하였다. pH 3.0 이하에서는 지상부 및 근부가 다같이 생장이 심하게 억제되었으며 잎에는 괴사반점이 나타났다. 색소의 흡광 spectrum은 7개의 peak가 나타났는데 Early splendor는 473nm과 535nm에 peak가 없었고, Tricolor는 476nm 및 546nm에 peak가 보이지 않았다. 강산성비는 식물색소 발현에 관여하였고 엽록소는 pH가 낮을수록 증가하였다. 주사현미경에 의한 엽표면 관찰에서는 pH 5에서도 이상이 관찰되기 시작하고 pH 4 이하에서는 괴사가 급격히 진행되고 있었다.

• Journal of Plant Biotechnology
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• 제5권3호
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• pp.137-142
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• 2003

The morphology of the leaves and the flowers of angiosperms exhibit remarkable diversity. One of the factors showing the greatest variability of leaf organs is the leaf index, namely, the ratio of leaf length to leaf width. In some cases, different varieties of a single species or closely related species can be distinguished by differences in leaf index. To some extent, the leaf index reflects the morphological adaptation of leaves to a particular environment. In addition, the growth of leaf organs is dependent on the extent of the expansion of leaf cells and on cell proliferation in the cellular level. The rates of the division and enlargement of leaf cells at each stage contribute to the final shape of the leaf, and play important roles throughout leaf development. Thus, the control of leaf shape is related to the control of the shape of cells and the size of cells within the leaf. The shape of flower also reflects the shape of leaf, since floral organs are thought to be a derivative of leaf organs. No good tools have been available for studies of the mechanisms that underlie such biodiversity. However, we have recently obtained some information about molecular mechanisms of leaf morphogenesis as a result of studies of leaves of the model plant, Arabidopsis thaliana. For example, the ANGUSTIFOLIA (AN) gene, a homolog of animal CtBP genes, controls leaf width. AN appears to regulate the polar elongation of leaf cells via control of the arrangement of cortical microtubules. By contrast, the ROTUNDIFOLIA3 (ROT3) gene controls leaf length via the biosynthesis of steroid(s). We provide here an overview of the biodiversity exhibited by the leaf index of angiosperms. Taken together, we can discuss on the possibility of the control of the shapes and size of plant organs by transgenic approaches with the results from basic researches. For example, transgenic plants that overexpressed a wildtype ROT3 gene had longer leaves than parent plants, without any changes in leaf width. Thus, The genes for leaf growth and development, such as ROT3 gene, should be useful tools for the biodesign of plant organs.