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Taxonomic Study of genus Sedum and Phedimus (Crassulaceae) in Korea Based on External Morphology (외부형태 형질에 근거한 한국산 돌나물과내 돌나물속과 기린초속의 분류학적 고찰)

  • Moon, Ae-ra;Jang, Chang-gee
    • Korean Journal of Plant Resources
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    • v.33 no.2
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    • pp.116-129
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    • 2020
  • The genus Sedum comprises about 400 taxa with worldwide distribution, and about 20 taxa of the genus Phedimus distributed from Asia to Europe. According to some taxonomists, Phedimus and Sedum are two separate genera of the family Crassulaceae; however, in Korea Phedimus has been treated as a subgenus Aizoon within the genus Sedum. This ambiguous taxonomic treatment of the genus Phedimus needs further confirmation. In the study, we investigated morphological characteristics such as the whole plant height, leaf morphology, and seed coat features of these two genera. We believe that these characters are very important to distinguish Phedimus and Sedum. The result indicated that the seed surface pattern was the most useful diagnostic character. The Sedum had a hexagonal pattern with a single nipple protrusion, whereas the Phedimus had a rectangular pattern with papilla on both ends. The results of this study strongly support the separation of Phedimus from Sedum and thus Phedimus need to be treated as an independent genus.

A test of the hybrid origin of Korean endemic Sedum latiovalifolium (Crassulaceae) (한국특산 태백기린초(돌나물과)의 교잡 기원에 대한 검증)

  • Yoo, Young-Gi;Park, Ki-Ryong
    • Korean Journal of Plant Taxonomy
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    • v.46 no.4
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    • pp.378-391
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    • 2016
  • Eighteen morphological characters from 40 populations and ten isozyme loci from 35 populations of Sedum latiovalifolium and related species were examined to investigate the degree of morphological and genetic variation. The high-frequency marker alleles $MDH-2^a$ and $PGI-1^a$ in S. aizoon, S. kamtschaticum, and S. zokuriense did not appear in the populations of S. latiovalifolium. In addition, the high-frequency allele ($MDH-2^c$) in S. latiovalifolium appeared at a very low frequency in other subg. aizoon species. Thus, the isozyme data did not support a hybrid origin of S. latiovalifolium from S. aizoon with S. kamtschaticum. The results of an unweighted pair-group method using the arithmetic average method and a principal components analysis using morphological data also did not support a hybrid origin of S. latiovalifolium. However, our data strongly suggest that some individuals from the populations found in the Gumdaebong area were most likely hybrids due to introgression between S. latiovalifolium and S. kamtschaticum or S. aizoon and S. kamtschaticum.

Baby Giraffe Rope-Pulled Out of Mother Suffering from Dystocia without Proper Restraint Device (기린 난산에서 물리적 보정장치 부재시 밧줄을 이용한 태아 견인)

  • Yong, Hwan-Yul;Park, Suk-Hyun;Choi, Myoung-Keun;Jung, So-Young;Ku, Dae-Chang;Yoo, Jong-Tae;Yoo, Mi-Jin;Yoo, Mi-Hyun;Eo, Kyung-Yeon;Yeo, Yong-Gu;Kang, Shin-Keun;Kim, Heon-Youl
    • Journal of Veterinary Clinics
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    • v.26 no.1
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    • pp.113-116
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    • 2009
  • A 4-year-old female reticulated giraffe (Giraffa camelopardalis reticulata), at Seoul Zoo, Gwacheon, Korea had a male calf with no help of proper restraint devices. The mother giraffe was in a danger of dystocia more than 7 hours in labor after showing the calf's toe of the foreleg which protruded from her vulva. After tugging with a snare of rope on the metacarpal bone of the calf and pulling it, the other toe emerged. Finally, with two snares around each of metacarpal bones, the calf was completely pulled out by zoo staff. After parturition, the dam was in normal condition for taking care of the calf and her progesterone hormone had also dropped down to a normal pre-pregnancy.

A Selection of Korean Native Sedum spp. for Evergreen Ground Covers of the Central Districts of Korea (중부지방 상록지피용 기린초 속의 조경용 소재 선발)

  • Lee, Sun-A;Ha, Yoo-Mi;Han, In-Song
    • Journal of the Korean Institute of Landscape Architecture
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    • v.37 no.5
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    • pp.90-97
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    • 2009
  • Sedum takesimenses among the Korean Native Genus Sedum was selected as evergreen ground covers during winter in the central districts of Korea. In order to obtain basic information for production as a pot flower with good quality, the effects of pinching frequencies on growth and flowering of S. takesimense were investigated. S. takesimense plant height became much shorter and numbers of lateral shoots were increased with increased pinching. Shoots of S. takesimense treated with 30% pinching during 2004 and 2005 showed greater length and less number of lateral shoots than those with 60% pinching. Leaves of S. takesimense treated with 70% shading showed a dark green color and had a longer shoot length and a lower number of shoots than cultivation under full sunlight. Therefore, Korean native S. takesimense will be utilized as ground cover treated with 70% shading or under a tree. Therefore, S. takesimense will be promising as ground cover materials in the central districts of Korea.

A Study on the Growth Models of Sedum takevimense as Affected by Difference of Soil Mixture Ratio in the Green Roof System (토양조성에 따른 옥상녹화용 섬기린초 생장모형 연구)

  • Kang, Tai-Ho;Li, Hong;Zhao, Hong-Xia
    • Journal of the Korean Institute of Landscape Architecture
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    • v.39 no.6
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    • pp.110-117
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    • 2011
  • In order to study the growth models between the growth of Sedum takevimense and growth rate in soil with three types of mix ratios, this experiment was carried out on April 3rd, 2011. A nonlinearity regression analysis was performed using the Logistic and Gompertz models by SPSS. According to the study of growth models of Sedum takevimense, the process of growth and management methods after over-wintering were explicitly determined. According to the measured values, the growth in the soil of $P_1P_2V_1$ and $P_2P_1V_1$ was better than that of $P_1$. Particularly, the average length of Sedum takevimense in the soil of $P_1P_2V_1$ was about twice as great as that in the $P_1$. The fitness test of the two growth models was: The predicted value and measured value were separately compared and analysed, the average fitting precision $R^2$ of the Logistic models was 0.995, but the average $R^2$ of the Gompertz models was below 0.978, which showed that the Logistic models were better than the Gompertz models. The growth models also showed that the growth time of Sedum takevimense was divided into three: rapid, most rapid and slow. When managed in the rapid and the most rapid time, it will grow better.

Photosynthetic Characteristics of Sedum takevimense on Various Moisture Conditions in a Green Roof System (옥상녹화시스템에서 수분 조건에 따른 섬기린초의 광합성 특성)

  • Li, Hong;Kang, Tai-Ho
    • Journal of the Korean Institute of Landscape Architecture
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    • v.41 no.6
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    • pp.140-146
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    • 2013
  • This experiment was conducted in order to study the physiological characteristics of Sedum takevimense in different moisture conditions. The photosynthetic rate, water use efficiency and the respiratory rate were determined by using a photable photosynthesis system. According to the results, the best illumination range and moisture range were explicitly selected. The highest photosynthetic rate was at $600{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, and after this value, the trend showed a reduction. When the moisture was 11.31%, the photosynthetic capacity and water use efficiency reached maximum value, but the respiratory rate reached maximum value at 7.91%. According to the measured values, the best illumination range was $600{\sim}1,200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ and the best moisture range was 7.09~11.31%.