• Korean Journal of Plant Resources
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• v.9 no.1
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• pp.11-21
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• 1996

This study has observed the development, structure and distribution of oil canals in mitsuba, seri, ashitaba and hamabohu, that are condiment herbs belonging to the Umbelliferae family, using a light microscope. Oil canals were found in the petioles, leaf blades, stems, roots, hypocotyls and cotyledons. Oil classified into distribution due to ring vascular bundles, as in mitsuba and seri, and distribution due to diffuse vascular bundles, as in ashitaba and hamabohu. Oil canal development in the cortex due to petiole thickening was followed by the development of collenchyma and vascular bundles. However, no vascular bundles were formed in some cases. Many oil canals were found in the periphery of the petioles. Oil canals in leaf blades were found on the adaxial and abaxial sides on the veins. Those around the main veins were larger. Steam oil canals were found in the cortex and pith in mitsuba and seri, and in the cortex and fundamental tissues around the xylem, in ashitaba and hamabohu, while those in the roots were found in the pericycle in mitsuba and seri, and in the collenchyma-like tissues and phloem in ashitaba and hamabohu. The transverse sections of oil canals were round or elliptical. The secretory cells in the cortex and pith were smaller than the neighboring parenchyma cells, while they were larger than the neighboring parenchyma cells in the phloem.

• Proceedings of the Korean Society of Crop Science Conference
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• 1991.05a
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• pp.60-61
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• 1991

• Proceedings of the Korean Society of Crop Science Conference
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• 2001.05a
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• pp.94-95
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• 2001

• Proceedings of the Korean Society of Crop Science Conference
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• 2004.04a
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• pp.212-213
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• 2004

• Korean Journal of Food Science and Technology
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• v.20 no.6
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• pp.742-748
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• 1988

The macro-and microstructure of Chinese cabbage used for Korean Kimchi preparation were examined and the texture characteristics of raw cabbage leaf and salted or blanched leaves were evaluated by cutting test. The length and thickness of leaf stalk increased with the order of pyllotaxis, but the thinning effect of outermost leaves was observed. The microstructure of cut-profile of stalk showed densely compacted vascular systems aligned in the center of stalk and the outer space was filled with large parenchima cells. Due to this structure, characteristic cutting curves were obtained by cutting test, composing three peaks of cutting for inner surface skin, center vascular system and outer surface skin. Salting and blanching increased the cutting force mainly due to the increase of Gutted cell wall number caused by the structure collapse.

• Journal of Plant Biology
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• v.35 no.2
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• pp.143-153
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• 1992

Nectar secretion from extrafloral nectary cells of Prunus yedoensis was examined by light and electron microscopy. Nectaries were composed of two or three layers of secretory cells and one layer of subsectretory cells. Vascular bundles in the petioles were connected to those of the subsectretory cell layer. Secretory cells had a number of mitochondria with poorly developed cristae. Plastids had little thylakoids and small vesicles, about 0.2 to 0.3 mm in diameter; however, no plastids had starch grains. Calcium oxalate crystals and plasmodesmata were frequently observed in the subsectretory and secretory cells, respectively. And nectar substances were observed in phloem of petiole, subsectretory, and secretory cells of the secretory gland. These results suggested that the nectar moved by symplastic transport through the plasmodesmata. On the other hand, the nectar droplets were observed in the secretory cell walls. in the cuticular layer just beyond of the former, and on the outer surface of the cuticular layer: such observations indicated that a apoplastic movement was involved in the final step of the nectar secretion. Cellular components related to the nectar transport, such as plasma membrane, cell wall and cuticle were not destroyed but intact: it was interpreted as a eccrine secretion.retion.

• Horticultural Science & Technology
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• v.18 no.3
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• pp.373-377
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• 2000

This study was carried out to verify the effect of fruit thinning on fruit development, and the results were as follows. The number of cells between fruit epidermis and periphery vascular bundle during 35 to 184 days after full bloom (DAFB) were constant with 14~17 cells, regardless of thinning at pink bud stage, fruitlet stage or non-thinning. However, the distance between epidermis and vascular bundle was longest in the fruit thinned at pink stage followed by fruits thinned at fruitlet stage and control. Therefore, it was seemed that the fruit size increment during 35 to 184 DAFB was due to the increment of cell size. Thinning time affected fruit size and the earlier the thinning times were the bigger the fruits were. However, there were no direct relationships between thinning time and the starch or tannin particle development in the cells of the fruit.

• Journal of Plant Biology
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• v.38 no.1
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• pp.79-86
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• 1995

Visible injury symptoms such as necrosis, chlorosis and premature senscence in the leaves of Ginkgo bloba and Pinus thunbergii treated with acid rain of pH 3.2 or below were observed. The epicuticular wax erosions were observed by SEM after exposure to acid rain of pH 2.4 and 3.2 in G. biloba and pH 4.0 below in P. thunbergii. The adaxial epidennal cells and sponge parenchyma cells were compressed, and those were distorted in the leaves of G. biloba treated with simulated acid rain of pH 3.2 or below. However, vascular tissue was intact. With increase of acidity, mesophyll cells were smaller than those of control while intercellular space in mesophyU was increased. In P. thunbergii, sponge parenchyma cells and vascular tissue except epidennis were distorted after exposure to acid rain of pH 2.4. The size change of stomata in foliar injury was not observed, but the stomatal index and size of stomatal aperture in leaves treated with acid rain increased. The stomata of injured leaf were opened in both species examined.amined.

• Journal of Plant Biology
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• v.38 no.1
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• pp.115-119
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• 1995

In order to clarify the relationship between the activity and age of vacular cambium in the rhizome of Botrychium ternatum, the cambia of the 6th and 10th internodes from its shoot apex were compared ultrastructurally and histochemically. The cambium in the 6th internode had two to four radially arranged cells in each row, and the cells are radially flattened and had thiner tangential walls than radial. The cambial cells were ultrastructurally characterlized by the presence of a large vacuole, few storage materials such as starch grains and lipid droplets, and various cell organelles such as mitochondria, endoplasmic reticulums and dictyosomes in cytoplasm. On the other hand, the cells of cambium in the 10th internode showed irregular arangement and somewhat enlargement in radial plane. The cells were filled with numerous storage materials and small vacuoles and had few cell organelles except for mitochondria. In addition, the activity of acid phosphatase appeared in the cambium of the 6th internode but of the 10th. From the above results, it is clear that the vascular cambium of the 6th internode was active and that of the 10th was dormant. Thus we reached a conclusion that the rhizome of '||'&'||'trychium ternatum has determinate cambium.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.3
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• pp.83-87
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• 1965

This experiment was done to observe the morphological change of plant under the cultivation of deep ploughing and heavy fertilization with paddy rice 1963 at Seoul. A seedling of 35 days old was transplanted June 1st, in a galvanized iron pot with botton 20 cm in diameter, which was painted white inside and filled with sand mixed with fertilizers. The treatments were 15cm soil depth of normal fertilization, 30cm of fertilization twice and 45cm of fertilization thrice. Replications were three. The plant was observed on main stem Aug. 6 before heading, Sep. 12 after heading and Oct. 17 at the time of harvest at the same pot. The results are as follows. The length and the width of leaf blades of the upper part on main stem have the tendency to be big and vigorous with the deep ploughing and heavy fertilizations(Fig 1, 2, 3 and 4). The number and the size of vascular bundles of main stem is to increase when the paddy is cultivated with the method of deep ploughing and heavy fertilizations(Fig 5). The number and the weight of roots of main stem increases with deep ploughing and heavy fertilizations(Fig 6).