• Journal of the Korean Society of Tobacco Science
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• v.3 no.1
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• pp.49-57
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• 1981

To obtain genetic information for breeding aromatic tobacco, broad sense heritabilities, phenotypic, and genotypic correlations were obtained for the following characters : days to frowert, plant height, number of leaves, leaf shape and nicotine. Six pure line varieties and the first and second generations of 5 crosses among them were employed in this study. The heritabilities for number of leaves and nicotine were very high in pure line varieties. However, the heritabilities for days to flower and yield were low in six varieties as well as in F2. Genotypic correlations had higher values than phenotypic did. Heritabilities calculated from segregating generations were lower than those from pure varieties, regardless of crosses involved. Positive phenotypic correlations between yield and plant height were observed in all crosses. Same phenomenon was observed with correlations between days to flower and number of leaves. The genotypic and phenotypic variances and covariances entering into the computation of correlations were used to construct the seletion indices for yield. The use and limitation of selection index was also discussed.

• Horticultural Science & Technology
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• v.34 no.5
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• pp.790-798
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• 2016

We quantitatively analyzed eight varieties of 6-year-old red ginseng, including four local landraces from the Inje, Geumsan, Jinan, and Punggi regions and four new varieties, Chunpoong, Yunpoong, Guempoong, and K-1, for 10 ginsenosides, acidic polysaccharide, crude polyacetylene, and total polyphenol content to find out which varieties are most suitable for producing red ginseng. Most of the new varieties contained more ginsenosides than the local landraces. While the acidic polysaccharide content of Geumsan red ginseng was lower than that of the others, its crude polyacetylene content was the highest, with a mean of 33.99%. The Inje, Geumsan, and Jinan red ginseng had a significantly higher total polyphenol content than the others.

• Journal of The Korean Society of Grassland and Forage Science
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• v.15 no.1
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• pp.37-42
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• 1995

This experiment was canied out to study the effects of seeding and harvesting dates on the growth of early and late maturing rye(Seca1e cereale L.) varieties at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Leaf and tiller numbers of rye per plant were increased with earlier seeding date, but no difference in the tiller numbers was found between harvesting dates of early and late maturing rye varieties. Tiller dry weight of an early maturing rye veriety, Wintermore was higher than that of a late maturing rye variety, Kodiak when sown as early as September. Maximun leaf area index(LA1) and leaf area index duration(LA1D) were achieved with earlier seeding and early maturing rye varieties. A higher correlation between the maximum LA1 or LAID and dry matter accumulation of rye varieties was observed in this experiment.

• International Journal of Industrial Entomology and Biomaterials
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• v.30 no.2
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• pp.75-80
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• 2015

The wet spinning of silk solution has attracted researchers' attention because of 1) unique properties of silk as a biomedical material and 2) easy control of the structure and properties of the regenerated silk fiber. Recently, studies have reported that different silkworm varieties produce silk with differences in the molecular weight (MW) and other mechanical properties of the regenerated silk fibroin (SF) film. In this study, we look at the effect of different Bombyx mori varieties on the wet spinning of SF. Although five regenerated SFs from different silkworm varieties have different MWs and solution viscosity, the wet spinnability and post drawing performance of regenerated SFs were not different. This result is due to low variability in the MW of the regenerated SF samples from the different silkworm varieties. In addition, unlike regenerated SF films, the mechanical properties of wet spun regenerated SF filament were not affected by silkworm variety. This result suggests that the mechanical properties of wet spun SF filament are less affected by MW than those of SF film are.

• Journal of Photoscience
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• v.8 no.2
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• pp.55-60
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• 2001

Ginseng (Panax genus) is one of the most medicinally important genera and consists of highly regarded medicines. Among the species of Panax, the ginseng species is widely known to have most medicinal quality. P. ginseng has 3 varieties, Jakyung, Chunggyung and Hwangsook, discovered in nature with different colors of stem and fruit, Jakyung has two cultivars, Yunpoong and Chunpoong. Rigorous phylogenetic analysis of these varieties and cultivars has been conducted with sequencing of rDNA region. The sequences of ITS1, ITS2 of every varieties and cultivars within P. ginseng were identical. The sequence of 5.8S rDNAs of Hwangsook variety were different from the sequences of 5.8S rDNAs of others by only one base pair at nucleotide position 14. In phylogenetic analysis and predicted RNA secondary structure study, it is assumed that evolution has proceeded from Hwangsook to other varieties. recently.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.46 no.5
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• pp.411-415
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• 2001

Fifty-four Korean native and 28 foreign rice varieties harvested in 1998 and 1999 were examined for antioxidative activity that is measured to a chemiluminescence and superoxide radical intensity, by the flow injection chemiluminescence (FI-CL) system and an electron spin resonance (ESR) spectrophotometer, respectively. In the chemiluminescence measurement by FI-CL, radical scavenger activity did not differ significantly among rice varieties between origin types of rice varieties, and between storage periods. GinSun and Hongchoengdo, colored rice exhibited high electron scavenging effect by ESR. Therefore, these results indicate that the pigments of rice varieties may play important antioxidative roles and that it may be possible to breed rice varieties with higher antioxidative potentials.

• Korean journal of applied entomology
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• v.14 no.3 s.24
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• pp.133-136
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• 1975

Influence of susceptible and resistant soybean varieties to the development of the soybean cyst nematode(Heterodera glycines) was examined. It does not seem likly that there are any differences between varieties in attracting the Second Stage larvae of the nematode. In susceptible varieties, there were large populations and three generations during a ten·week examination period, while the resistant varieties maintained very low populations and had only two generations.

• Journal of Plant Biology
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• v.19 no.2
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• pp.33-36
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• 1976

Present work was attempted to investigate the karyotype, the reciprocal translocation of chromosomes and the geographical distribution of three Paeonia species grown wild in Korea with the aim of elucidating the taxonomical affinities of the species. Prior to conducting these works, it was required to clarify the karyotypes of the cultivated varieties of P. albiflora which has been grown since long time ago in this coundtry for medicinal value. Present report is part of the series of karyotype studies now being extensively conducted using varieties (or lines) of P. albiflora collected across the country. Arm ratio, number of trabant, kind of trabant chromosomes and karyotype formula are different among the six cultivated varieties. Excepting one, five varieties used had invariably trabants on D and E chromosomes while no trabant was found in C chromosome.

• Journal of Sericultural and Entomological Science
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• v.41 no.3
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• pp.167-173
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• 1999

Survival analysis with life span of silkworm moth was investigated from 277 varieties preserved and maintained in Korea. Ten varieties showed long and short life span were selected for the investigation of the longevity in response to mating and surviving. The density distributions of average life span of female and male in all varieties used was 8.3days about 13%. The frequency of average survival according to life span survived 178 varieties(64.3%)for 5-10 days in male, but the female was survived 147 varieties(53%) for 10-15days. Average longevity of unmated female and male were respectively 9.5days and 9.0 days, and female survived 0.5 days longer than male. On the other hand, average longevity of mated female and male were 8.8 days and 7.7 days, respectively. It was found that mating activities affected significantly to the adult life span, especially to that of males than that of females.

• Journal of The Korean Society of Grassland and Forage Science
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• v.15 no.2
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• pp.106-111
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• 1995

This study was planned to identify the effect of low-temperature stress on Alcohol dehydrogenase(ADH) isozyme in sixteen varieties of Italian ryegrass using starch gel electrophoresis. The specific electrophoretic zymograms of each variety were observed by ADH isozyme. The results were summarized as follows: 1. All tested varieties displayed two band zone by ADH and R.f values were 0.63 and 0.60, respectively. 2. There were four band type for ADH isozyme of 16 varieties classified with ADH isozyme dyeing intensity. According to dyeing intensity 7, 2, 1 and 6 varieties belong to banding type I,II,III and IV, respectively(Fig.2-A, B). 3. The effect of short tern low-temperature stress induces ADH gene expresson in Italian ryegrass, which may reflect a fundmental shift in energy metabolism to ensure plant tissue survival during the low-temperature stress period.