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油菜의 脂肪酸組成改良育種에 關한 硏究 Ⅵ. 油菜登熟中의 脂肪酸合成에 미치는 O-erucic acid 遺傳子의 作用
J. I. Lee(李正日),K. Takayanagi(高柳謙治),T. Shiga(志賀敏夫) 한국육종학회 1974 한국육종학회지 Vol.6 No.2
The process of fatty acid synthesis of high-erucic acid varieties and O-erucic acid variety were investigated during the maturing period of rapeseeds. The fatty acid composition showed highly significant difference between both variety groups around 30 days after flowering Any significant differences in fatty acid composition between two variety groups were not detected in the former period of 30 days after flowering. O-erucic acid variety contained some amount of erucic acid. However, erucic acid synthesis was discontinued in O-erucic acid variety in the later period of 30days after flowering. Rapeseed oil contained much amount of M.G. in the initial stage of maturity (30days after flowering). The amount of erucic acid containing in O-erucic acid variety was ranged from 6 to 37% in M.G. and D.G. gene reaction of O-erucic acid started from the later of 30days after flowering and fatty acid synthesis was significantly different at two stages : initial and late period of maturity in rapeseeds.
油菜의 播性分類와 生態變異에 關한 硏究 第1報 油菜의 春播性精度分類와 春播時期移動에 따른 生態變異
J. I. Lee(李正日),D. S. Chung(丁東秀) 한국육종학회 1975 한국육종학회지 Vol.7 No.2
In order to obtain a basic data for the cultivation and the breeding of rape, grade of spring nature and the morphological variation to spring sowing time were investigated. Grade of spring nature could be classified to 8 classes by the method whether the material matured or not. In the morphological variation of useful characters, as the spring sowing time went to the later, the germinating was accelerated but the maturing time went to the later while hight, number of total branches, ear length, number of pods per ear., pod length, number of grains per pod, grain weight of 1,000 seed and oil content had a tendency to decrease so that might show a high negative correlation. The most proper lime of spring was also considered as February 23 to March 5 in the southern part of Korea.
J. I. Lee(李正日),H. W. Park(朴喜運),Y. S. Ham(咸泳秀) 한국육종학회 1983 한국육종학회지 Vol.15 No.2
This experiment was carried out to establish the cutting method and to increase the seeds of F₂ populations by cutting from F₁ plant. Cuttings treated with NAA were higher than IAA in rooting ratio, and which in the concentration of 1,000ppm cuttings were rooted highest by 89.8% and sections with 2-bud also higher than 1-bud in rooting. In the cultured clay soil cutting media, cuttings showed better rooting success with vigorous growth than in sand or uncultured soil media. From a F₁ hybrid plant, 4 and 57 rooted cuttings were taken which produced average of 15 and 11 seeds per twice respective cutting at 75 days and 125 days after planting seed stock. Therefore 2 lots of cutting from a plant and seed stock produced 794 seeds totally.
油菜粕 飼料化를 위한 有害成分(Glucosinolate) 改良育種에 관한 硏究 第Ⅰ報 導入地域에 따른 油菜品種의 Glucosinolate 含量差異
J. I. Lee(李正日),J. K. Bang(方鎭淇),B. S. Kwon(權炳善),K. S. Min(閔庚洙) 한국육종학회 1984 한국육종학회지 Vol.16 No.2
Oil-free meals of selected 91 rapeseed genotypes( 76 unimproved and 15 improved) of diverse genetic background were examined fur varietal differences on the major three glucosino lates content to search breeding materials for improving the quality of seed meals. The average contents of glucosinolates from unimproved 76 cultivars were 3.43 mg/g 3-buteny 1-isothiocyanate (BI). 0.50 mg/g 4-pentenyl-isothiocyanate (PI), and 6.58 mg/g 5-vinyl-2-oxazolidinethione(OZT), and total glucosinolate content was averaged 10.51 mg/g from oil-free seed meals. It were revealed the significant differences on BI, PI and OZT contents between means of varietal groups by origins, and found the negative correlations between ITC (BI+ PI) and OZT in the unimproved varieties from Taiwan, China, and Europe. Among the improved 15 rapeseed cultivars or lines, Youngsanyuchae, Naehanyuchae, Mokpo 64, Mokpo 68, Mokpo-MS, Bronowski, and Tower were selected as low glucosinolate rapeseed which had lower than 2,0mg/g in total glucosinolate.
油菜의 脂肪酸組成改良育種에 關한 最近의 內外 動向과 우리나라 油菜育種의 새로운 方向
J. I. Lee(李正日) 한국육종학회 1975 한국육종학회지 Vol.7 No.2
Recent directions in rape breeding have been focused on quality improvement breeding of oil and cake. The goals to increase the composition of good fatty acids in rape oil and to genetically control and/or reduce the Formation of noxious fatty acids. The increase of good quality fatty acids in rape oil and rape cake would sllow increased utilization of rape as a domestic animal feed by reducing the harmful glucosinolate of the cake. Currently Korea is breeding for improved fatty acids in rape oil. High-yielding O-erucic acid strains have been succesfully selected at the Mokpo Branch Station of the Crop Experiment Station. Basic Studies on shortening rape’s life cycle by 70 days to allow 4-5 generations per year are under way. Other projects include the use of male sterility to exploit heterosis and to increase the efficiency of quality improvement breeding and the breeding of high-yielding good fatty acids varieties adapted to the southern part of Korea.
N. S. Seong(成洛戍),J. I. Lee(李正日) 한국육종학회 1984 한국육종학회지 Vol.16 No.2
1. Seventy seven sesame cultivars were bargely classified into six varietal groups, but those were aggregated into two varietal groups except four varieties forming each varietal group solely. Group I also can be classified into some sub-groups and eighteen clutivars fail to form varietal group. 2. Group I and group II contained fifty four (70%) and nineteen cultivars (25%), respectively. Most varieties in Group I showed medium or late flowering and considerably large variation in other agronomic characteristics but varieties in group II revealed early flowering, and relatively narrow variability and inferiorty in vigorosity and yield components. 3. Most of the varietal groups were not associated with their geographical origin. 4. Days to flowering and plant height among the nine characters were the largest contirbutors to the D² in both intra-and inter-groups.
Relationship between Seed Leakage Solutes during Imbibition and Germinability on Soybeans
Y.W. KIM(金容旭),J.I. LEE(李正日) 한국육종학회 1981 한국육종학회지 Vol.13 No.2
Laboratory experiments were conducted to evaluate seed leakage solutes during imbibition as physiological character associated with germinability of soybeans. The electrical conductivities of the leakage solutes of soybean seeds from four varieties Essex, Pickett, Wayne and Bonus were measured at different temperatures and soaking time. As time and temperature increased, leakage solutes from the seeds become significantly pronounced. There were significant differences in the leakage solutes among varieties. The average electrical conductivity of leakage solutes from Essex and Pickett after 40 minutes soaking was significantly lower at 20, 25 and 30℃ than those of Wayne and Bonus. The conductivity of leakage solutes was negatively correlated with subsequent seedling growth of soybean seeds.
Y.W. KIM(金容旭),헤리 마이너(H.C. MINOR),J.I. LEE(李正日) 한국육종학회 1981 한국육종학회지 Vol.13 No.1
Laboratory experiments were conducted to ascertain responses of soybeans to water stress during germination. Germination of 101 genotypes was measured under water stress at 25℃. Nine genotypes among the 101 tested were consistently ranked ‘high’ for germination at -3, -6, -12 and -15 bars soil moisture tension. Most genotypes germinated at levels up to -12 bars, but failed to germinate at -15 bars. The critical soil moisture for soybean germination was between -12 and -15 bars. Both genotype and moisture × genotype interactions were highly significant sources of variation for germination and seedling growth. The soil moisture level × genotype interactions were largely due to differences in magnitude of responses rather than to direction of responses to the decreasing soil moisture. The specific effect of soil moisture treatment on germination and seedling growth was confounded by initial differences in seed quality.