• 식물분류학회지
• /
• 제44권4호
• /
• pp.233-237
• /
• 2014

처녀이끼과 신분류군 구름처녀이끼(Hymenophyllum wrightii f. serratum C.S. Lee & K. Lee)가 한국의 제주도 한라산에서 발견되어 기재되었다. 구름처녀이끼는 처녀이끼에 비하여 잎은 키가 작고, 잎몸의 맨아랫부분은 넓으며, 잎몸은 넓은 난형이고 포자낭군이 더 크며 포막의 입술 가장자리가 세열된 점이 뚜렷이 구별된다. 새로운 국명은 높은 산에 서식한다는 의미로 구름처녀이끼로 하였고, 주요형질에 대한 종기재 및 해부도와 서식지 식물사진 및 한국산 처녀이끼속 식물에 대한 검색표를 제시하였다.

• 식물분류학회지
• /
• 제43권4호
• /
• pp.263-266
• /
• 2013

베트남 Kon Ka Kinh 국립공원에서 최근에 발견된 Jasminum attenuatum Roxb. ex G. Don, (물푸레나무과)을 베트남 미기록종으로 보고한다. 본 종은 근연종인 J. latipetalum과 J. simplicifolium subsp. funale와는 엽신의 모양, 화서에 5-20개의 꽃이 달리고 선상의 포를 가지며 악편은 짧고 무모이며 역원추형의 악을 갖는 특징으로 근연종들과 구분된다. 본 연구에 종 동정을 위한 중요한 형질과 분류학적 기재, 식물도해, 원색사진 및 화분의 주사전자현미경 사진을 제시하였으며 본 종과 근연종인 J. latipetalum과 J. simplicifolium subsp. funale 와의 분류학적 형질들을 비교하였다.

• 식물분류학회지
• /
• 제43권3호
• /
• pp.188-195
• /
• 2013

한국산 쑥속(Artemisia L.) 산흰쑥절(sect. Absinthium)의 분류군들을 대상으로 기준표본과 원기재, 생체 및 표본에 근거하여 외부형태학적 형질과 학명을 재검토하였다. 쑥속 산흰쑥절에 포함되는 분류군의 생육지, 생육형, 지하부의 구조, 잎의 형태, 두상화서의 형태는 분류군을 식별하는데 유용한 형질로 관찰되었다. 국내에 분포하는 산흰쑥절은 산흰쑥(A. sieversiana), 비단쑥(A. lagocephala), 애기비쑥(A. fauriei)의 3분류군으로 정리되었으며, 이에 따른 분류군의 형질기재 및 도해를 제시하였다. 특히, 화탁에 털이 있는 애기비쑥은 화탁에 털이 없는 더위지기절(sect. Abrotanum)의 큰비쑥(A. fukudo)과 서해안의 갯벌에 혼생하며, 외부형태적으로 절간의 잡종으로 추정되는 개체들이 분포하였다.

• Applied Microscopy
• /
• 제24권4호
• /
• pp.1-12
• /
• 1994

대마(Cannabis sativa L.)의 잎과 암꽃의 포(苞)를 투과 전자현미경으로 관찰한 결과 다음과 같은 결과를 얻었다. 어린 엽육세포에서 관찰되는 원시색소체는 타원형으로서 장축의 크기는 $1.5-2.0{\mu}m$이었으며, 스트로마 기질내에는 100nm 크기의 색소체소구가 많이 나타났다. 파종후 3주후에 채취된 시료의 엽육세포에 있어서는 그라나가 잘 발달된 엽록체가 관찰되었는데, 틸라코이드의 신장과 더불어 엽록체의 형태도 긴 장타원형을 이루고 있었다. 엽육세포가 성숙하면서 전분립의 수와 크기가 점차 증가하였고, 이에 따라서 엽록체의 형태도구형에 가까운 타원형으로 변하였다. 특히 이 시기의 그라나간틸라코이드는 매우 팽창되는 양상을 나타내었다. 엽육세포 가운데 비교적 어린 단계에 있는 세포에서는 원시색소체가 엽록체와 함께 출현하기도 하였는데, 이때의 이들 엽록체는 전분립을 전혀 지니지 않았다. 엽육조직과 암꽃의 포에서 관찰된 표피세포는 전분립을 지닌 엽록체가 세포벽을 따라 나타났으며, 핵은 세포의 기부에 규칙적으로 배열하였다. 비분비모는 세포의 중앙에 큰 액포가 발달하였으며 아주 적은 세포질이 세포벽을 따라 존재하였다. 이들 세포질내에도 옅록체가 나타났는데, 이들은 엽육세포의 엽록체에 비해 현저히 작았고, 형태도 타원형에 가까왔다. 한편, 분비모에서는 매우 특징적인 색소체가 출현하였는데, 이들은 격자구조의 막성구조(reticulate body)를 지니면서 분비작용을 왕성히 하고 있었다.

• 생태와환경
• /
• 제33권2호통권90호
• /
• pp.69-79
• /
• 2000

Fractal geometry has become one of prospective research approaches as the complex structure of natural entities is not easily characterized by traditional Euclidean geometry. With the fractal geometry, we can better decipher the complex structure and identify natural and anthropogenic agents of landscape patterns occurring at different spatial scales. The usefulness of fractal, however, has not been fully appreciated among Korean academic societies, especially in ecological and limnological fields. We attempt to address three points in this study. First, we introduce the concept and dimension of fractal and review relevant research approaches, especially with respect to ecological and limnological phenomena. Second, we explore possible applications of fractal to some aspects of geography and land use characteristics in South Korea. For the analyses of fractal dimensions, we used data published in other studies previously and collected for this study. Data were analyzed by a perimeter/area method of fractal dimension for the spatial distribution of global solar radiation and leaf area index, and the movement of wild boars in forested landscapes of mid-eastern Korea. The same approach was also applied to the water channel of a hypothetical river and the shape of reservoirs in Yongin, Kyunggi Province. Finally, we discuss the results and key issues to consider when a fractal approach is employed in ecology and limnology.

• Journal of Crop Science and Biotechnology
• /
• 제10권4호
• /
• pp.249-256
• /
• 2007

A study was conducted to observe the variation and inheritance of agronomic traits and their interrelationship in mungbean. The objective of the study was to compare agronomic traits and hardseed percentage of 268 recombinant inbred lines(RILs) developed from the cross between wild Vigna subspecies sublobata "ACC 41" with the mungbean cultivar "Berken". The RIL population and their parents were evaluated under controlled conditions in a glass house at the University of Queensland, Brisbane, Australia. The results showed significant differences among the RILs and among the parents in all traits under study. Berken had a longer flowering date and a higher seed weight per plant, but less total leaf number and pod number per plant than ACC 41. A germination test between papers revealed that ACC 41 was 100% hard-seeded and did not germinate at all, while Berken germinated up to 100%. Their RILs distributed well between 0 to 100% hardseed. Upon scarification, all hardseed germinated within seven days. Narrowsense heritability estimates of total leave number, hardseedness, pod length, and pod width were highly heritable at 89.9, 98.9, 93.7, and 93.2%, respectively. The heritability of seed weight per plant and number of seeds per plant were lower at 63.1 and 58.4%, respectively. Seed weight per plant showed positive transgressive segregation when compared with ACC 41 and a positive correlation with 100 seed weight. While the number of seeds per pod showed a negative transgressive segregation when compared with Berken and a negative correlation with pod length and pod width. The RILs gave a 1:1 segregation ratio in leaflet shape, growth habit, and growth pattern, indicating that these traits were controlled by a single dominant gene.

• 한국초지조사료학회지
• /
• 제11권1호
• /
• pp.1-5
• /
• 1991

Tall fescue(Festuca amndinacea Schreb.) is a productive pasture grass that is widely adapted to the soil and climate of Korea. It is regarded, however, as relatively low in palatability and nutritive value. On the other hand, Italian ryegrass(lo1ium rnultz$om Lam.) is highly nutritious and palatable, but is essentially weak in cold tolerance. Numerous investigators have succeeded in producing hybrids between Lolium spp. and Festuca spp. but no improved varieties have resulted. Therefore, intergeneric hybridization of Italian ryegrass with tall fescue is employed in 1984 to improve the adaptive and cold resistance quality of Italian ryegrass. In the mean time, F1-hybrid plants obtained by crossing Italian ryegrass x tall fescue were observed in open field. The results are summarized as follows: 1. Leaf-size and silica cell hair were intermediate between the types of parents but the shape of auricle tended to show Italian ryegrass and auricle-cilia to show tall fescue. 2. Roots of $F_1$-hybrid plants were mainly distributed at top soil and did not produced florescence material. 3. Head type of hybrids was intermediate between the types of parents but ray length was somewhat less than the length of tall fescue ray. Typical Italian ryegrass or tall fescue-like phenotypes were not observed. 4. Anthers of $F_1$-hybrid plants were formed but pollen were not formed. Even though pollen were formed, they were all empty. 5. Hybrid plants were more winterhardy and summer persistency than Italian ryegrass. They showed a equivalent growth to Italian ryegrass in spring and to tall fescue in summer. 6. Chromosome of $F_1$-hybrids was allopolyploid(2n=4~=28) and all $F_1$-hybrid plants were sterile.

• Journal of Plant Biology
• /
• 제5권2호
• /
• pp.13-16
• /
• 1962

Without annual ring, the bamboo can not measured by ordinary mensuration method. Other methods yet tried failed to prove the reliability. That means, as often pointed out, that the bamboo lumbering (including forest management) is not free from being precarious. Noting the fact, this author performed a serieds of comparative observations on a group of bamboos in different stages of growth in order to find out if there is any surer mensurability. A conclusion has been reached that the external feature of joints of branch has close connection with the age of bamboo, that the joints of the third major branch counting from the ground have, as shown in the first table, the most probability, its mean being 94.3 per cent, and that those in ages of 3 to 5 have the probability of 100 per cent, showing the far greater accuracy as compared with those in older ages. The above conclusion needs to be adjusted with the following findings; 1) When observed disregarding the joint-tongue(the remainder of the preceeding year's sheath), the major branches show no better probability than the minor ones. 54 to 78 per cent of them shows no difference between them. Probability is averaged by 60 per cent. 2) When in spring the old sheaths drop away from the joints, the new ones sprout out in their places and consequently the joints present an appearance of a kind of joint-ring. But since this joint-ring does not always exactly represent the plant age, some other method must be sought after to count the age. This author noticed what is called "joint-tongue" the tongue-like part of triangle shape which remains at the base of the sheath of the fallen leaf. A fact was ascertained that when the number of the joint-ring coincides with that of the remaining joint-tongue, it exactly indicates the age of the plant.the plant.

• 한국식품영양과학회지
• /
• 제6권1호
• /
• pp.55-59
• /
• 1977

The consumption of sugar in our diet increased so great that much U. S. dollars are spended to import sugar source from foreign contries. To replace a part of it we adopted mother plant and seeds of the well-known Stevia (Stevia rebaudiana Bertoni M.) originated from south America, from the Agricultural Experimental Station of Hokkaido, Japan, in 1974. In order to determine the growth condition of Stevia in our climate and soil condition, the results of survey and determination were as follows: 1. Germination rate of Stevia was averaged 33.6% at 35 th day after seedling and the maximum germination period was between 5 and 20 days after seedling. 2. The seedling rate of Stevia was about 8%. 3. Establishment of roots of Stevia propagated by cutting method was above 90% but only S-1 strain showed lower rate., 75%. 4. S-2 strain showed the best growth rate that was about 160cm by plant height and it was decreased by the following order : S-4, S-3, S-1, S-6 and S-5 strains. 5. S-4 strain resulted in 45 branches that was the highest number among strains tested and S-2 strain was the next. 6. The content of sweetening compound of Stevia, stevioside, was 5.3% in S-1, S-2, S-5 and S-4 strains but S-3 and $S^*$-6 strains were relatively low content, 4.9%. From the above results we obtained Stevia could be propagated by cutting method and the growth conditions including plant height, number of branches and content of stevioside were relatively better in S-2 and S-4 strains that were differentiated by the shape of leaf.

• 식물분류학회지
• /
• 제41권4호
• /
• pp.338-344
• /
• 2011

한국산 메꽃속 4종 1변종과 1종의 외군을 대상으로 종의 실체를 확인하고, 유연관계 및 진화경향성을 파악하기 위하여 분자계통학적 연구를 수행하였다. 메꽃속의 주요 형질로는 잎의 모양과 화관의 길이, 털의 유무 등이 있다. 하지만 잎의 형질에서 많은 변이 현상이 나타나고 있어 종 분류에 어려움이 있다. 분자계통학적 연구결과 갯메꽃이 하나의 분계조를 형성하여 가장 기부에 위치하였고, 애기메꽃과 큰메꽃의 ITS 지역과 psbA-trnH 지역에서는 독립적인 분계조를 형성하지 못하여 두 종의 관계가 명확하지 않았다. 따라서 두 종의 관계는 본 연구에 사용된 마커들로는 부족하며 앞으로 더 많은 개체와 다양한 마커들을 통한 연구가 수반되어야 한다. 메꽃은 선메꽃과 유집되어 유연관계가 가까운 것으로 나타났다.