• Korean journal of applied entomology
• /
• v.19 no.4 s.45
• /
• pp.221-227
• /
• 1980

A new disease of strawberry caused by Alternaria was found in Gim Hae, Gyougnam province, in July 1979. The symptoms of the disease occurred mainly on leaves as showing dark brown spots with circular to irregular, $5\~6mm$ in diameter. The pathogen was identified as Alternaria alternate (Fr.) Keissler which has not been described in Korea as a pathogen of strawberry disease. The common name of the disease was given as Gum un mum byung of strawberry. The conidia shape and size of this fungus varied considerably with culture media. The measurements of conidia and beak on corn meal agar were $20.1\times9.3{\mu}\;and\;4.0\mu$, respectively, which were shorter than those on strawberry leaf lesions in the field. Among 49 strawberry varieties tested, Morioca 16 and Robinson were highly susceptible to the disease by artificial inoculation and Catskill, Cyclone, Northwest, Merton princess, Juspa and Daehak I were moderately susceptible whereas 31 varieties were resistant. This fungus could also infect the leaf of Common garden sunflower, Double sunflower and Mexican sunflower among the 14 plants species tested.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.40 no.4
• /
• pp.481-486
• /
• 1995

The salt stress at seedling stage of winter barley was examined in different concentrations of NaCl containing 1/2 Hoagland solution. Fresh weight of seedling at 30 days after seeding was highest at 25mM of NaCl concentration containing 1/2 Hoagland solution but if the NaCl concentration was more than 50mM it began to decrease seriously. Water content in plant was decreased according to increase of NaCl concentration in 1/2 Hoagland solution, so physiological mechanism of NaCl in barley was different from saline plant. Stoma number per cm$^2$ of first leaf was higher than that of control in case of stressed by NaCl but in that case the leaf length was decreased so the number of stoma per first leaf was slightly decreased. Chloroplast shape was not changed by 75mM of high NaCl contained 1/2 Hoagland solution but cell division at root growing point was inhibited by 75mM of NaCl. As the result of salt stress mitochondria was ruined in structure and irregular solid was found to be transfered from the cytoplasm to the cell wall in root growing point.

• Korean Journal Plant Pathology
• /
• v.3 no.2
• /
• pp.100-107
• /
• 1987

Pre-pentration activity of Pyricularia oryzae Cav. from the stage of conidia germination to appressorium formation was examined on rice leaf epidermis under light and scanning electron microscopes to determine the causes· for differences in blast susceptibility between plants grown under three different soil moisture conditions in the greenhouse. No significant differences were found in the external shape of leaf epidermal cells including bulliform cells between plants grown under different soil moisture conditions. Growth and orientation of germ tube and morphology and size of appressorium of P. oryzae did not vary with soil moisture treatment. Site of appressorium formation was consistent over soil moisture treatment with the highest frequency of bulliform cell $(35\~48\%)$, followed by short cell $(19\~27\%)$, and long and guard cells $(13\~20\%)$. No appressorium was formed on trichome. This result suggests that the observed differences in blast susceptibility between plants grown under different soil moisture conditions were not due to the differences in the pre-pentration activity of P. oryzae on those plants.

• Journal of Sericultural and Entomological Science
• /
• v.46 no.1
• /
• pp.12-17
• /
• 2004

New triploid mulberry cultivar, Suilppong was bred among selected lines from F$_1$ seedlings obtained by crossing the female, artificial tetraploid No. 411 which obtained from Chungilppong seedlings, and the male, Kugsang 21. Local adaptability test has been carried out at four places (Suwon, Kongju, Jeonju and Jangsung) for five years since 1997. Leaf quality was tested by silkworm rearing for two silkworm rearing seasons (spring and autumn) at Suwon in 2000. Suilppong was recognized to be superior in productivity to control cultivar, Kaeryangppong. The new cultivar, Suilppong, has following agronomic characteristics as compared with Kaeryangnppong, which is leading cultivar widely cultivating in Korea. It is belonging to Morus alba L. with mixed shapes from the ovate to 5 lobated leaf shape, sprouting in spring nearly the same to the Kaeryangppong (Morus alba L.), high leaf yielding of 20% compared to Kaeryangppong (Morus alba L.). It is adaptable to everywhere except the places where cold damage occurs frequently in Korea. Suilppong is recommended to rear silkworms not only in spring but also in autumn besides for young silkworms.

• Journal of Life Science
• /
• v.18 no.6
• /
• pp.759-763
• /
• 2008

Halophila ovalis (R. Br.) Hook. fil. was first collected from the Ando, Yeosu, Korea in 2007. H. ovalis is Widely distributed from sub-tropical to even tropical areas and produces the seeds using bisexual reproduction. Its leaf shape was oblong to ovate. Its leaf blades were rigid in texture, with a strong support to the leaf. Erect shoots arose at irregular intervals along the rhizome. The distance between the intramarginal vein and leaves margin was small. Nucleotides in ITS 1 and ITS 2 regions between the Korean and Japanese H. ovalis were found to be 100% similar, whereas Korean H. ovalis was found to have four nucleotides in the positions of 202 bp to 206 bp for 5.8S. In the analysis of the phylogenetic relationship using NJ method, Korean H. ovalis had a monophyletic genetic tree with Japanese H. ovalis, but no phylogenetic relationship with types from the Philippines, Australia, Malaysia, and Vietnam. The first occurrence of H. ovalisin Korea was associated with a strong migration of gene flow from Japan and high water temperature caused by the variations in climate.

• Korean Journal of Plant Resources
• /
• v.15 no.1
• /
• pp.36-42
• /
• 2002

Sixteen Atractylodes japonica Koidz. accessions were collected in Jeonbuk, Kyeongnam, Kangwon and Kyeonggi province, and their quantitative characteristics were compared with each other. The relationship of variation between Atractylodes japonica Koidz. accessions was also investigated by means of multivariate analysis. Hamyang 1 accession had the most desirable quantitative characteristics among the accessions: plant height was 86.2cm, number of leaves, 117.2 and number of stems, 34.3. Sudo 1 accession had 12 stems, the most among the accessions. The length of leaf margin serras found in all of them was on average 1.6mm. Most accessions had simple or palmately compound leaf with oval or elliptical type of the leaf shape. The accessions could be classified into three groups by average linkage cluster method. The most remote relationship was found between Group 1 containing Jinan 1, Jinan 2 and Group 3 containing Jeongsu, and Geoje.

• Korean Journal of Medicinal Crop Science
• /
• v.18 no.1
• /
• pp.46-50
• /
• 2010

In order to development medicinal Artemisia herbs of high quality, Korean A. annua L. were investigated with its ecological and morphological characteristics, and basic statistical data of agronomic characteristics. This species, which is annual herb, is mainly distributed to marginal land, riverside, roadside, grassland. Ecological niche is low species in competition of the others. Its pollination is basically anemogamous, but is frequency pollinated by insects. This species is characterized as tap root, 1~3 pinnate compound leaf of ovate or narrowly ovate, stem is green, erect and solitary. Inflorescence is paniculate, receptacle is not hair. Capitulum, consist of ray floret and disk floret, is subglobose shape. Additionally, this species could be easily discriminated from related Artemisia herbs by the capitulum size. Ray floret is female, disk floret is bisexual. Flowering season is from August to October. Seed is achene unattached hair. Stem length ranged from 179 cm to 225 cm, and stem diameter and number of branch were $17.14\;{\pm}\;1.68\;mm$, $2.43\;{\pm}\;0.51\;mm$, respectively. Length and width of leaf were $14.5\;{\pm}\;0.5\;cm$, $15.0\;{\pm}\;1.0\;cm$, and leaf number of main stem were $48.06\;{\pm}\;10.57\;cm$, respectively. Fresh weight of aerial parts and root were $364.7\;{\pm}\;14.1\;g$, $32.6\;{\pm}\;5.1\;g$, and its dry weight were $136.6\;{\pm}\;10.0\;g$, $14.9\;{\pm}\;2.34\;g$, respectively.

• Korean Journal of Plant Taxonomy
• /
• v.35 no.4
• /
• pp.287-294
• /
• 2005

Three unrecorded fern species from the flora of Korea, Nephrolepis cordifolia, Athyrium epirhachis, and Asplenium castaneo-viride, are reported here. Nephrolepis cordifolia, recognized as introduced species and cultivation in Korea until now, is found in the wild at the entrance of small cave in Jeju island. Athyrium epirhachis is found under the Quercus acuta forest at about 400 - 500 m alt. in Jeju island. This species is similar to A. otophorum but different from the latter by having once pinnately divided leaf blade and the decurrent base of ultimate segment. Asplenium castaneo-viride is hybrid between A. ruprechtii and A. incisum and is distinguished from parental species by presence of proliferation, shape of leaf blade, pattern of venation, and leaf texture.

• KSBB Journal
• /
• v.5 no.2
• /
• pp.175-182
• /
• 1990

Protoplasts, isolated from leaf of N. tabacum NR-/SR+ and N. glottnosa were electrofused and divided with a plating efficiency of 30∼35% in AAPI 9M medium. Green callus lines were selected in protoplast-derived colonies on MSNO3 selection medium with 1.2mg/ml streptomycin sulfate on the basis of nitrate reductase proficiency and streptomycin resistance. Four putative hybrid plant lines regenerated from the green callus lines had intermediate morphology between that of parents with respect to floral shape, corolla length and ovate leaf blade. Zymograms of leaf peroxidase and esterase from these putative hybrid plant lines showed isozyme profiles derived from both parents and also, they exhibited additional and lost bands. Cytological analysis of two putative hybrid plant lines gave chromosome counts of 2n=66 in L22 and 2n=54 in L44 which were less than the expected number of N. tabacum(2n=48) and N. glutinosa(2n=24).

• Journal of Sericultural and Entomological Science
• /
• v.44 no.2
• /
• pp.45-50
• /
• 2002

New mulberry cultivar, Hansungppong, was bred among selected lines from F1 seedlings obtained by crossing the female, Yongcheonppong, and the male, Kugsang 21. Local adaptability test has been carried out at two places (Suwon and Chunchun) for four years since 1995. Leaf quality was tested by silkworm rearing for two silkworm rearing seasons (spring and autumn) at Suwon in 1998. Hansungppong was recognized to be superior in productivity and cold resistance to control cultivar, Yongcheonppong. The new cultivar, Hansungppong, has following agronomic characteristics as compared with Yongcheonppong, which was strongest leading cultivar against cold injury in Korea. It is belonging to Morus alba L. with the ovate leaf shape, sprouting in spring nearly the same to the Yongcheonppong (Morus alba L.), high leaf yielding of 10% compared to Yongcheonppong (Morus alba L.) and the high degree of cold resistance. It is adaptable to everywhere in Korea. Hansungppong is recommended to rear silkworms not only in spring but also in autumn besides for young silkworms.