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수종의 (數種) 한국산 녹나무과 식물에 있어서 뿌리와 줄기의 이기목부의 (二期木部) 비교해부
소웅영,임동옥 ( Woong Young Soh,Dong Ok Lim ) 한국산림과학회 1987 한국산림과학회지 Vol.76 No.4
A comparative anatomy between the secondary xylem in the root and the stem of some Korean Lauraceae, including 6 genera and 7 species, was carried out in this study. The results are as follows; diameter and length of vessel element and fiber are wider and longer in the root than the stem. The angle of end wall of vessel element is more inclined in the root than the stem. ,also more number of bar on the perforation plate of vessel element in root wood is found. From the anatomical characters of root and stem wood in some Lauraceous species, it is suggested that the wood of the root is. phylogenetically mote primitive than that of the stem, except the diameter of vessel element.
한국산 목본식물에 (木本植物) 대한 계통분류학적 연구 - 목련과 , 붓순나무과 및 오미자과의 비교목부해부 (比較木部解剖) -
소웅영(Woong Young Soh),박상진(Sang Jin Park) 한국식물학회 1985 Journal of Plant Biology Vol.28 No.4
Anatomical characters of secondary xylem in the trunk of Magnoliaceae, Winteraceae and Schizandraceae, including six genera and eleven species grown naturally in Korea, were studied to elucidate the relationship between genera or families. It is considered that among these families specialization in the perforation plate, the angle of end wall to the vessel axis, and diameter of vessel element, is in the order of Winteracae, Magnoliaceae, and then Schizandraceae. In Winteraceae, vessel elements have wholly scalariform perforation plates with very numerous bars. Among Magnoliaceae the perforation plates are scalariform with very numerous bars in Michelia, with few bars in Liriodendron, and with few bars or simple in Magnolia. In Schizandraceae, Schizandra shows scalariform perforation plates with few bars or simple perforation plates, and Kadsura shows almost simple ones.
한국산 목본식물에 (木本植物) 대한 계통분류학적 연구 - 차나무과의 목재비교해부 -
소웅영(Woong Young Soh),선병윤(Byung Yun Sun) 한국식물학회 1986 Journal of Plant Biology Vol.29 No.4
Anatomical characters of the trunk woods of Theaceae, including six genera and seven species collected in Korea, were studied to elucidate the relationship among the genera of the family. Among three genera in Ternstoemieae, Eurya is the least specialized, and Cleyera is less specialized than Ternstroemia in respect to the specialization of the perforation plate and the ray. In Theoieae consisting of three genera, the most primitive one is Thea, and Camellia is more primitive than Stewartia in the trive, from the view of the specialization of the bar arrangement in scalariform perforation plate and the angle of end wall to the vessel axis. The specialization of the perforation plate of vessel element suggests that Theoieae is more advanced group than Ternstroemieae.
소웅영(Woong Young Soh),강경덕(Kyung Duck Kang) 한국식물학회 1989 Journal of Plant Biology Vol.32 No.4
Developmental anatomy was conducted in order to elucidate the differentiating pattern of fascicular cambial initials in the hypocotyl of Ricinus communis. The homogeneous procambium with relatively short cells in early stage is transformed into a heterogeneous structure with long and short cells in late stage in tangential view. Fusiform and ray initials are gradually originated from the long and short cells of the procambium in hypocotyl in later stage respectively. Fusiform initials are not shorter than procambial cells because of the successive elongation of vascular meristematic cells. Therefore, the distinction between procambium and fascicular cambium is not made from comparison with their cell length. The characteristics of the fascicular cambium are gradually acquired at or just after completion of hypocotyl elongation.
물오리나무와 사방오리나무에 있어서 도관요소 (導管要素) 및 섬유의 (纖維) 칫수 변이
소웅영(Woong Young Soh),한경식(Kyeong Sik Han) 한국식물학회 1985 Journal of Plant Biology Vol.28 No.1
Dimensional variation of secondary xylem elements, such as vessel element and fiber, was investigated in root, stem and branch of Alnus hirsuta and A. firma. It is clear that vessel diameter in the root is the widest, next in the stem, and the least in the branch. Length of vessel element among them becomes, however, larger in following sequence; stem, root, and branch, whereas fiber diameter and length are the widest in the root, the second in the stem, and the least in the branch. The size of secondary xylem element at any one level in tree increases from the center(pith) of the organs through a number of annual rings to the outer.
은단풍 ( Acer saccharinum L. ) 유식물의 뿌리에서 유관속 형성층의 초기발생
소웅영(Woong Young Soh),홍성식(Sung Sik Hong),조덕이(Duck Yee Cho) 한국식물학회 1991 Journal of Plant Biology Vol.34 No.4
The origin of cambial initials from procambium was studied in the seedling root of Acer saccharinum. In transverse view, the first periclinal divisions of procambial cells occurred just outside of each early metaxylem and resulted in meristematic strips. As root development progressed, the division activities appeared subsequently outside of each late metaxylem and then in pericycle cells opposite the four protoxylem poles. Eventually, such meristematic strips were connected completely each other. Thus, a nearly rectangular shaped meristematic layer in outline was formed outside the xylem in a whole root transectioned. In tangential section, early procambium showed a homogeneous structure consisted of uniform short cells with transverse end walls. However, some of the procambial cells did elongate, whereas others divided transversely. The former became more elongate, tapered, and vacuolated. Finally, they differentiated into fusiform initials. Short cells consisting axial strands divided continuousely in transverse plane and became ray initials, while some short cells elongated and transformed into long cells. The early ontogeny of vascular cambium in Acer saccharinum root was interpreted to be established by a gradual process.
소웅영(Woong Young Soh),김영순(Young Soon Kim) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.4
To elucidate the origin of secondary growth in the rhizome of B. ternatum, the developmental changes of vascular cambium was observed in ultrastructural features. The vascular cambium was gradually differentiated from procambium as in seed plants, but the cambial activity did not persist very long so that the cambial cells became a dormant state like fossil cryptogams. Dense cytoplasm of procambial cells became progressively sparse during the growth, and the tiny vesicles were fused to form numerous small vacuoles and then a few large vacuoles. These gradual changes and the occurrence of storage materials which was associated with the developmental stages might support the progressive differentiation of the cambial cells. In addition, the cessation of cambial activity could be indicated by the facts that late vascular cambial cells accumulate large lipid bodies and show very small peripheral cytoplasm and unlikely thickened cell wall, compared to other meristematic cells. Therefore, the vascular cambium showed the characteristics of both seed plants and fossil cryptogams from the view poiint of cambial ontogeny and activity.
소웅영(Woong Young Soh),조덕이(Duck Yee Cho),이은경(Eun Kyong Lee) 한국식물학회 1996 Journal of Plant Biology Vol.39 No.1
Embryogenic callus was selected from callus induced from hypocotyl segment cultures of Daucus carota seedlings on MS basal medium supplemented with 1.0 ㎎/L 2,4-D. Cell clumps prepared from the embryogenic callus were transferred to MS medium without 2,4-D for somatic embryo development. Cotyledonary abnormalities were frequently observed on somatic embryos developed after the incubation of cell clumps in MS basal medium with 1.0 ㎎/L 2,4-D for one week and then subculture in the same medium but without 2,4-D for two weeks. The percentage of abnormalities was as follows: 5% one cotyledon, 21% three cotyledons, 6% four cotyledons, 5% five cotyledons, 0.2% six cotyledons and 1% trumpet-like cotyledons. On the other hand, the normal somatic embryo with two cotyledons appeared at 63%. The germination rate of somatic embryos was higher in two cotyledon somatic embryos than in multicotyledonary embryos. Trumpet-like somatic embryos did not germinate normally showing limited elongation and enlargement of roots and cotyledons without shoot development. From anatomical examination circula procambium in the root of somatic embryo began to branch around the middle regions of the hypocotyl which extended into the cotyledons through the cotyledonary nodes and the number of branched procambial strands in hypocotyl was equal to the number of cotyledons. Monocotyledonous somatic embryo always had larger cotyledon than that of somatic embryos with multicotyledons and had horseshoe-like cotyledons where the procambium was of the same structure.