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J. H. Nam(南重鉉),C.H. Cho(曺章煥),M. W. Park(朴文雄),E. S. Lee(李殷變),W. S. Ahn(安完植),Y. S. Kim(金泳相) 한국육종학회 1984 한국육종학회지 Vol.16 No.2
Effect of photoperiod on the thirty winter and spring wheat cultivars vernalized was studied in the green house controlled under the temperature of 25℃ (day) and 20℃(night), and at the photoperiod from 8 to 24 hours. Among the wheat cultivars tested, there showed less heading response by photoperiod increased in early maturing cultivars than that in late maturing cultivars. More differences of cultivars in heading appeared under shortday condition than that in long-day condition.
麥類의 世代促進方法에 關한 硏究 Ⅱ. 平地와 高嶺地를 利用한 年2回 世代促進栽培
C. H. CHO(曺章煥),W. S. AHN(安完植),Y. I. NAM(南潤一),K. H. JI(池光鉉) 한국육종학회 1978 한국육종학회지 Vol.10 No.1
In order to examine the possibility of the growing two generations in one year of segregating wheat and barley populations, three wheat and three barley varieties were direct seeded and transplanted after vernalization while F₃ wheat and barley populations were transplanted following vernalization at an alpine location during the summer season. These results showed that with wheat and barley segregating line: with a winter growth habit grade of less than IV, it was possibly to grow two generations in one year by using the methods of germinating the immature seed and seed-green vernalization, and the transplanting at Daekwanleung before early part of July. This experiment tested the possibility of growing two generations of wheat and barley in one year in Korea by growing a summer generation at the alpine location of Daekwanleung. A winter generation was grown at either Suweon, Mooan or Cheju in Korea. The results are as fellows: 1. All the wheat and barley varieties with a winter growth habit grade of less than IV headed when direct seeded at Daekwanleung before than May 25. 2. The adequate seed-green vernalization period for both barley and wheat was 30 to 35 days and the proper transplanting time after vernalization was late June to early July. 3. Wheat and barley segregating lines with winter growth habit grades of less than IV can produce to generations in one year by using the methods of germinating the immature seed and seedgreen vernal ization, if transplanting occurs at Daekwanleung before the early part of July.
麥類의 屬間 交雜에 關한 硏究 Ⅲ. Triticum aestivum과 Secale cereale의 屬間交雜 F₁에 있어서 細胞學的 硏究
W. S. AHN(安完植),C. H. CHO(曺章煥),H. B. KIM(金興培),J. W. SHIM(沈載昱) 한국육종학회 1978 한국육종학회지 Vol.10 No.1
In the present investigation, cytological and genetical research on the F₁hybrid between Triticum aestivum (Chokwang and Jugoku #81) and Secale cereale (Jaelae rye) were carried out. Twenty eight chromosomes were observed in both of the mitotic and meiotic cells of the F₁ hybrid. The chromosomal behaviour of the mitotic cells were considered to be regular but irregular chromosomal orientations were apeared in the meiotic cells. The chromosomes both origin were distributed at random and a high frequency of the chromosome bridges were observed in Anaphase I. Also the micronuclei were observed in 39.5-41.7% of the pollen tetrad.
麥類의 屬間交雜에 關한 硏究 Ⅰ. 麥種間 相互交雜 및 EACA 處理가 雜種種子 形成에 미치는 影響
C.H. CHO(曺章煥),W.S. AHN(安完植),M.Z. KIM(金文子),K.S. MIN(閔庚洙) 한국육종학회 1977 한국육종학회지 Vol.9 No.1
Inter-generic hybridizations were made among the species T. aestivum, T. durum, H. vulgare and S. cereale using 0.1% concentration of immunosuppressant EACA treatment, The results obtained were as follows; 1. In reciprocal T. aestivum x H. vulgare crosses no viable seed were obtained. The cross T. durum x H. vulgar gave 6 viable seeds. 2. The cross H. vulgare x S. cereale resulted in 9.2% of the, fertilized florets setting seed. However, none had a hybird embryo. The reciprocal gave a 0.12% seed set. 22 seeds were viable from the 31 seeds obtained from this cross. 3. T. aestivum x S. cereale cross resulted in 26.3% of the fertilized florets setting seed. In T. durum x S. cereale crosses, 10.6% of the fertilized florets set seed. 4. A differential response to a 0.1% concentration of EACA was observed. T. aestivum intergeneric crosses showed a 4.8% to a 6.0% higher seed set than did none treated plants. However, H. vulgare plants gave a low seed set than did the none treated plants.
麥類의 屬間交雜에 關한 硏究 IV. 8倍體 Primary Triticale의 細胞學的 硏究
W. S. AHN(安完植),C. H. CHO(曺章煥),H. B. KIM(金興培),J. W. SHIM(沈載昱) 한국육종학회 1979 한국육종학회지 Vol.11 No.1
In the present investigation, cytological and genetical research on Primary Triticale hybrids between Triticum aestivum (Jugoku #81) and Secale cereale (Jaelae) was carried out. Fifty six chromosomes were observed in both mitotic and meiotic cells of Primary Triticale. The chromosomal behaviour of both mitotic and meiotic cells were more regular than that of F₁’s, especially in meiotic division. However, 79.1% of the meiotic cells had from 1 to 8 univalents.
W. S. Ahn(安完植),C. H. Cho(曺章煥),B. H. Hong(洪丙憙),B. R. Sung(成炳列),J. H. Nam(南重鉉) 한국육종학회 1982 한국육종학회지 Vol.14 No.1
This experiment intended to reveal the relationship between F₂ individuals and F₃ lines in important agronomic traits to clarify the effectiveness of early generation selection in wheat breeding program. Correlation analysis between F₂ individual and F₃ lines indicated that the plant height, heading date and winter hardiness may be improved effectively through early generation selection and with remarkable genetic advances by selection. Early generation selection for yield potential varied depending upon the cross combination tested, but, generally speaking, correlation coefficients estimated between F₂ and F₃ generation, hertabilities and estimated genetic advances were low enough to conclude that its selection would be neglible in early generation. It was noted that the winter hardiness were the fundamental traits needed to create desirable population, since those winter hardy lines found to be more tillering and high yielding than the winter susceptible lines.
W. S. Ahn(安完植),Y. S. Kim(金泳相),C. H. Cho(曺章煥),J. Y. Choi(崔鍾烈),B. Y. Kim(金鳳淵) 한국육종학회 1984 한국육종학회지 Vol.16 No.3
The intergeneric hybrids of barley (♀) and wheat (♂): F₁ (=Manker l6/Chinese Spring) BC₁ (=M16/2*CS) and BC₂ (=M16/3*CS) were developed. The agronomic characters, reaction to diseases, number of stomata, hairiness of the leaf surface, and chlorophyll and total nitrogen contents of flag leaf were compared with those of their parent, Manker 16 and Chinese Spring. Of the 4,240 florets pollinated, 78 embryos were cultured from which 7 hybrid plants with 2n=28 chromosomes were obtained but those F₁ plants were self sterile. The first backross seeds examined had 49 chromosomes in the embryo. Twenty-four seeds obtainde from the BC₂hybrids (=M16/3*CS), and these BC² hybrids appeared the 46-49 somatic chromosomes. The heading dates of these plants showed a late tendency compared with their parents. However, they grew vigorously and speltoedspike type of wheat. The numbers of stomata on leaf surface were less than that of parents, and chlorophyll content of flag leaf was intermediate. Also those plants were resistant to stem rust and immune to powdery mildew.
秋播栽培 條件下에서 麥類의 播性消去 限界期에 관한 硏究
CHO C.H(曺章煥),M.W. PARK(朴文雄),W.S. AHN(安完植),J.H. NAM(南重鉉),B.Y. SEONG(成炳烈),Y.W. HA(河龍雄) 한국육종학회 1980 한국육종학회지 Vol.12 No.3
The vernalization periods required for various classes of growth habit in wheat and barley was studied in the fall sown cultivars at Suweon. The vernalization requirement for those I-VI class of winter growth habit was almost completed before the end of the year (81 days after sowing).
맥류의 세대촉진방법에 관한 연구 IV. 수원지역에서 소맥 1년 2기작 세대촉진재배
성병열,조장환,박문웅,홍병희,안완식,남중현,Seong, B.Y.,Cho, C.H.,Park, M.W.,Hong, B.H.,Ahn, W.S.,Nam, J.H. 한국작물학회 1980 한국작물학회지 Vol.25 No.4
To establish a generation acceleration technique, two crops a year at field condition of Suweon, 10 varieties different in their spring growth habit were tested with 6 different seeding time after harvesting. These materials were harvested on June 10, 19, 79 and tested for their seed production ability at varions seeding time from July I I to August 15 with a week interval. An immatured seed germination technique and green vernalization methods were applied in cycling generations and the results obtained were summarized as follows. 1. In summer growing, seedlings establishment after transplanting was better in earlier transplanting. 2. Heading time was remarkably enhanced by earlier transplanting. Considering the results of two years early or mid of July was the suitable time to plant the second summer crop. 3. Those varieties of spring growth habit expressed little variations in plant height among the varieties. In 1978 which is referred as warm year produced plant height as tall as 8-16cm and poor crop but produced good crop with 25-65cm plant height in 1979. 4. No definit tendency in the length of spike was. observed among the cultivars but longer spike was found in winter wheat compared to the spring. 5. Number of spikes per plant was ranged from 1 to 3 regardless the transplanting time in 1979. However, more spikes per plant were produced in early or mid of July transplanting and those varieties of higher growth habit than V did not produces any spikes. 6. Higher number of grains per spike was found at earlier transplanted varieties. Therefore, it is concluded that those materials of I-IV growth habit with mid or early July transplanting would be suitable in practical sense considering their ability of seed production. 7. Two-year results indicated that wheat crop can not tolerate the temperature level higher than average 32$^{\circ}C$ C at Suweon. In this regard, the cultivation schedule was established assuming average temperature condition like the year of 1979 which was possible to grow wheats.