• KOREAN JOURNAL OF CROP SCIENCE
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• v.37 no.1
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• pp.45-53
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• 1992

This studies were conducted to investigate the physiological characteristics of photosynthesis and dry matter accmulation of 2 Tongil type and 2 Japonica type varieties under different temperature and light intensity condition. Photosynthetic activities were lower in Tongil type varieties than Japonica type at low temperature(17$^{\circ}C$), but higher in Tongil type varieties at high temperature in each growth stages. The degradation rate of photosynthesis was higher in Tongil type varieties than Japonica type varieties at low temperature and Tongil type varieties were showed high photosynthetic activities at high temperature ($25^{\circ}C$). Specific Leaf Area in each growth stages were the highest at tillering and increased from panicle formation stage to heading stage. The ratio of respiration to photosynthesis (R /P$\times$200) into upper three leaves were significantly high in third leaf and showed same slope in each varieties. CGR, NAR were higher in Tongil type varieties than Japonica type varieties and yields, havesting index were showed high in Tongil type varieties.

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.1
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• pp.43-49
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• 2015

This experiment was conducted to evaluate the agronomic characteristics and forage productivity of Italian ryegrass cultivars in Yecheon, Kyeongbuk from 2011 to 2013. The experimental design was a randomized complete block design (RCBD) with three replications. Italian ryegrass cultivars were seeded on Sep. 26 in 2011 and Sep. 25 in 2012. The Italian ryegrass cultivars were harvested on the heading date of the variety. The cold-resistance of domestic cultivars was stronger than other foreign varieties. Among early-maturing cultivars, the dry matter (DM) yield of the "Kowinearly" was 10,031 kg/ha, which was significantly higher than that of other cultivars (p<0.05). In medium-maturing cultivars, the DM yield of the "Kowinmaster" and "Tam 90" were 10,484 and 8,191 kg/ha, respectively. Of the two, the former's DM yield was higher than the latter's (p<0.05). Among late-maturing cultivars, the DM yield of "Hwasan 104" was 10,641 kg/ha, which was similar to that of "Hwasan 101" and significantly higher than the other late-maturing cultivars (p<0.05). According to the results obtained from this study, an early-maturing variety with cold-tolerance and high productivity is required for the paddy field cultivation of an Italian ryegrass cultivar after rice harvest in the mid-northern region of Korea. A medium- or late-maturing variety is more advantageous for the field cultivation of the maximum quantity that is possible. In conclusion, to select which variety/ies to grow, the climate of the growing area, weather conditions, and the cropping system must all be considered.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.3
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• pp.247-256
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• 1994

This experiment was carried out to determine harvesting date and cultivar effects on growth characteristics, forage yield and quality of spring sown oats(Avena surivu L.) at the forage experimental field, College of Agricultural and Life Sciences, Swul National University, Suwwn from March 22 to June 20, 1993. The experiment was arranged in a split plot design with three replications. The main plots consisted of the harvesting dates such as early(24 May), mid(8 June) and late(20 June). The subplots consisted of different maturities of oat cultivm such as Speed oat, Cayuse, Foothill, Sv841034 and Magnum.

• Korean journal of applied entomology
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• v.15 no.1 s.26
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• pp.23-27
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• 1976

Screenhouse experiments were conducted to find out the varietal difference in ovipositional preference of the striped rice borer moths (Chilo suppressalis W.) on eight varieties of rice and its association with several plant morphological characters. The results indicated the strong preference of the moths for ovipositing on several varieties. The varieties Tongil (Suweon 213-1), Yushin, Jinheung and TKM-6 had comparatively more egg masses and more eggs than the varieties IR-26, IR-747, Rexoro and Juckna. The strong ovipositional preference of moths of Tongil, as compared to the resistant variety TKM-6 and the susceptible variety Rexoro, was. always consistent in this study whenever the number of tillers were uniformed and each two varieties were paired. It could be concluded that the moths definitely preferred Tongil among the test varieties. There was not any significant correlations between the ovipositional preference and the plant characters; such as number of tillers per plant, plant height, external diameter of stem, and size of leaf. The cause of strong perference of the moths for ovipositing on short type varieties Tongil and Yushin were still suspectable.

• Journal of Plant Biotechnology
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• v.43 no.4
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• pp.457-465
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• 2016

Microsatellites are one of the most suitable markers for identification of variety, as they have the capability to discriminate between narrow genetic variations. The polymorphism level between 120 microsatellite primer pairs and 148 soybean varieties was investigated through the fluorescence based automatic detection system. A set of 16 primer pairs showed highly reproducible polymorphism in these varieties. A total of 204 alleles were detected using the 16 microsatellite markers. The number of alleles per locus ranged from 6 to 28, with an average of 12.75 alleles per locus. The average polymorphism information content (PIC) was 0.86, ranging from 0.75 to 0.95. The unweighted pair group method using the arithmetic averages (UPGMA) cluster analysis for 148 varieties were divided into five distinctive groups, reflecting the varietal types and pedigree information. All the varieties were perfectly discriminated by marker genotypes. These markers may be useful to complement a morphological assessment of candidate varieties in the DUS (distinctness, uniformity and stability) test, intervening of seed disputes relating to variety authentication, and testing of genetic purity in soybean varieties.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.84-84
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• 2018

참억새(Miscanthus sienesis)는 화본목 벼과 억새속에 속한 다년생 단자엽식물로 동아시아와 오세아니아 동쪽 해역에 자생하고 있으며, 국내에서는 관상가치가 높아 정원용이나 조경용 소재로 이용되고 있는 대표적인 산림식물이다. 억새속(Miscanthus)은 물억새(M. sachariflorus), 참억새(M. sinensis), 억새아재비(M. longiberbis), 장억새(M. changii)로 분류하고 있으며, 이는 종을 구분하는 화기구조가 작고, 변이가 다양하기 때문이다. 그 중 참억새는 이러한 변이를 이용하여 다양한 초장과 엽 무늬를 가진 재배품종이 많이 개발되었으며, 내한성 또한 강해 정원용 관상식물로서의 가치가 높이 평가되고 있다(Lewandowsik et al, 1964). 지금까지 참억새 재배품종은 엽 무늬를 중심으로 개발되어 품종간 높은 유사성을 가지고 있어 구별하는데 어려움이 있었다. 본 연구에서는 새로운 참억새 품종개발시 기존품종과의 차이를 구별할 수 있는 기준을 제시하고자 기존 참억새 재배품종들에 대해 형태적 특성을 조사 분석하여 고찰해 보았다. 조사결과 가로무늬를 가진 'Strictus'와 'Zebrinus' 품종은 형태적으로 매우 유사하였으나 전체적인 모습에서 'Zebrinus'가 'Strictus' 품종에 비해 잎의 끝부분이 늘어지는 정도가 커 처진 특성을 나타내었다. 또한, 세로무늬를 가진 'Cosmopolitan'과 'Carbaret' 품종의 경우 초장 및 엽신의 길이가 유사하였으나 엽 무늬 위치에 차이가 있는 것으로 나타났다. 엽 폭이 좁은 세엽종인 'Morning Light'와 'Little Kitten' 품종은 형태적 차이는 없지만 가장자리 엽 무늬 유무로 구분이 가능하였다. 반면에 'Adagio'와 'Little Kitten, 품종은 형태적으로 매우 유사하여 좀 더 세밀한 조사가 필요할 것으로 보인다. 앞으로 더 많은 참억새 재배품종의 형태적 특성을 조사한 자료를 이용한다면 신품종 개발시 기존 재배품종과의 차이를 비교하는데 효율적으로 이용될 것으로 기대된다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.3
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• pp.226-235
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• 2002

This experiment was to evaluate lodging characteristics of 35 recommended rice varieties of Kyonggi-do at normal (110 kg N/ha) and hen (220 kg N/ha) nitrogen application rates during 1999 to 2000. At heavy N fertilization rate, varieties that were highly resistant to lodging were Obongbyeo, Daejinbyeo, Naepoongbyeo, Nonganbyeo and Ilpumbyeo. Fourteen varieties including Daeanbyeo were moderately resistant and 11 varieties including Jinbubyeo were susceptible to lodging. The lodging-related characters which showed the highest effect on lodging at lodging degree of 9 were culm length and height of center gravity, culm length at lodging degree of 5, and culm length and the third internode length at lodging degree of 3 or below. The difference in rice yield between normal and heavy nitrogen fertilization rate was within 5% in early-maturing varieties but there was great yield difference in mid- and late-maturing varieties depending on the degree of lodging. Consequently, stable rice yield could be obtained by selecting lodging-resistant varieties and lowering fertilization rate, specially in the paddy field where lodging occurrence is common.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.25 no.4
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• pp.66-72
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• 1980

Forth soybean (Glycine max (L.) Merr.) cultivars were evaluated to determine the extent of crop injury caused by differential sensitivity of cultivars to two rates of alachlor, linuron, and metribuzin. Most cultivars were relatively tolerant of alachlor at 120 and 240g/10a and also linuron at 62.5 and 125g/10a. However, many cultivars were highly sensitive to metribuzin at 50 and 100g/10a. Some of the most sensitive cultivars were ‘Kyungnam 2’, ‘Toyosuzu’, ‘Noki 1’, ‘Iwade 2’, and ‘Hampton’. Metribuzin also showed a very narrow margin of safety to soybean cultivars.

• Journal of Plant Biotechnology
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• v.43 no.3
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• pp.367-375
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• 2016

In the present study, we conducted genetic characterization of 90 commercial maize varieties and parental lines using microsatellite markers. Thirteen microsatellite markers were selected from 100 primer pairs in the maize genome data on the basis of polymorphism information contents (PIC) value and distinct amplification products. These markers detected 5 to 24 alleles, with an average of 13.69. The mean PIC value was 0.865 and ranged from 0.716 to 0.942. The unweighted pair-group method with arithmetical average (UPGMA) analysis was conducted for constructing the dendrogram using Jaccard's genetic similarity coefficient. The genetic similarity varied from 0.07 to 0.824. Thirteen microsatellite markers identified all 90 maize varieties and parental lines. The maize varieties were clustered into 5 major groups consistent with type and pedigree information. The microsatellite profile database of maize varieties could be used to select comparative varieties through genetic relationship analysis between existing varieties and candidate varieties in distinctness tests.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.2
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• pp.82-87
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• 1994

This study was planned to identify the variety of Italian ryegrass using electrophoresis. Thirty seven varieties of Italian ryegrass were tested by starch gel electrophoresis. The specific electrophoretic zymograms of each variety were observed by Alcohol dehydrogenase(ADH) and Esterase. The results were surnrnerized as follows; 1. AU varieties displayed two band zones by ADH and Rf values were 0.63 and 0.6 (Table 2, Fig. 2). 2. There were five band type for ADH isozyme of 37 varieties classified with isozyme banding pattern. According to the isozyme band type 7, 2, 6, 18 and 4 varieties belong to group, I, II, III, IV, and V, respectively (Table 2). 3. The varieties displayed single band zone for Esterase isozyme and Rf value was 1.00 (Table 2, Fig. 4). 4. According to banding type, Esterase isozyme of 37 varieties classified into 3 groups, 22, 8 and 7 varieties belong to group, I , II, and III, respectively (Table 2).