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.

동작물의 기상재해와 그 대책

조장환,이은섭,하용웅,이정일,Cho, C.H.,Lee, E.S.,Ha, Y.W.,Lee, J.I. 한국작물학회 1982 한국작물학회지 Vol.27 No.4

Yield loss of wheat and barley due to meteorological constraints has been analyzed in order to get the basic information, which will lead to the counter-measures for dissemination of agricultural technology and administration. These meteorological damages were analyzed on the results of percentage yield loss and mechanism of damage and the aspects of constraints were explained. The annual yield loss of wheat and barley were 21.7% by meteorological stress: Cold damage, 5.9% ; excessive soil moisture, 5.6% ; lodging, 2.9% ; drought, 3.0% ; disease, 4.3% etc. Those damages by the stresses mentioned above and rain damage were analyzed in relation to the growth stages and the degrees of damage. The predispositions and the growth of wheat and barley to those meteorological stress are also discussed. Varietal resistances of wheat and barley to those stresses were indexed and the physiological and morphological characteristics of these resistant cultivars are described. Cultural practices to minimize the damages were also reviewed.

온도 및 일장조건이 소맥의 생육 및 수량에 미치는 영향

조장환,정태영,Cho, C.H.,Chung, T.Y. 한국작물학회 1979 Korean journal of crop science Vol.24 No.2

To observe the effects of temperature and photoperiod on the growth and yield of winter wheat (Triticum aestivum, L) eight varieties including Chang Kwang were tested at various treatments like longday-high temperature (24hrs-20\circ), shortdayhigh temperature (12hrs-20\circ), longday-low temperature (24hrs-14\circ) and shortday-low temperature (12hrs-14\circ). Among the traits measured, days to heading, plant height, spike length, number of spikes per hill and grain yield per hill were generally decreased at high temperature and long day treatment and increased at low temperature and shortday condition. Number of grains per spike was decreased at low temperature and short day condition while increased at longday and high temperature conditions. Grain weight was decreased significantly at high temperature and shortday while increased at low temperature and longday treatment.

보리 × 밀 屬間雜種의 特性에 關한 硏究

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.

국소적으로 진행된 위암환자에 있어서 장기생존한

조장환(C H Cho),황규철(K C Whang),최승호(S H Choi),김규례(K R Kim) 대한소화기학회 1986 대한소화기학회지 Vol.18 No.1

The gastric cancer is the second common malignant in Korea. The treatment of choice is curative resection following early diagnosis, but at the time of diagnosis it was usually advanced. So long survivor is not common. We experienced long survivor of locally advanced gastric cancer after gastric resection and adjuvant chemotherapy.

Physiological Factors associated with Heading Time of Wheat, and Their Genetic Nature and Selection Efficiency

CHO C.H(曺章煥),B.K. KIM(金鳳九),B.H. HONG(洪丙憙),J.H. NAM(南重鉉),K.W. CHUNG(鄭吉雄) 한국육종학회 1981 한국육종학회지 Vol.13 No.1

This study was subjected to clarify the physiological factors associated with heading and maturing of wheat and their genetic studies, relationship among heading time and involved factors as well as selection efficiency to serve for improvement of early maturing and high yielding wheat varieties. The results obtained to the present time were summarized as followings. 1. Physiological factors associated with heading time of wheat can be represented by growth habit, photowresponses, especially heading response to high temperature-shortday response, earliness in narrow sense and winter hardiness. In the areas where cold damage is negligible three factors except winter hardiness would be the major factors associated with heading time. Determination of growth habit was possible by growing materials at high temperature and longday condition with different vernalization periods. Photo-responses could be determined under high temperature-shortday and earliness in narrow sense under high temperature-longday. 2. Spring growth habit is controlled by four major genes Vrn₁, Vrn₂, Vrn₃ and Vrn₄. These genes are dominant over winter growth habit and Vrnl is found to be epistasis to the other Vrn genes. Winter growth habit is recovered. 3. Photo-insensitivity and earliness in narrow sense are controlled by one or two major genes in some crosses while polygenic inheritance are also observed in some. crosses. 4. Winter hardiness is quantitatively inherited, thus controlled by many genes 5. Studies on the earliness with segregating material planted in the field proved that this trait is determined by one or two major gene(s). However, in some crosses it was found to be polygenic. 6. Field heading time and photo-responses, earliness in narrow sense and growth habit were highly correlated each other but winter hardiness exhibited negative relations with field heading time and involved physiological factors. Thus, winter susceptibility was a disadvantageous trait for improvement of early maturing varieties. 7. Heritabilities estimated for heading time was considerably high regardless growing conditions. However, highest heritability was estimated for the materials grown under high temperature and shortday condition. 8. In relationship between heading time and grain yield, early maturing lines frequently damaged, particularly young spike primordia, by low spring temperature and increased sterile spikelet it will be desired to recombine some degree of winter growth habit, low temperature adaptability and photo-insensitivity. High grain weight and grain plumpness should also be considered in selection procedure for improving early maturing wheat varieties.

日長條件 따른 小麥의 稈長變異 및 遺傳에 關한 硏究

C.H. CHO(曺章煥),B.H. HONG(洪丙憙),J.H. NAM(南重鉉),B.H. CHANG(張炳浩) 한국육종학회 1980 한국육종학회지 Vol.12 No.2

To investigate the genetic and ecological variation of culm length of wheat the different daylength has been applied to major wheat varieties planted at greenhouse in Suweon. Standard errors of culm length were larger at 12 and 8hrs day length than that of 24hrs. Variations of culm length due to different photoperiod were more remarkable in medium and short culms than that of long one. Number of genes controlling culm length of variety Robin #2 was more or less 2 genes. This study has been conducted to investigate the genetic and ecological variation of wheat calm length measured from those plants grown at greenhouse. The results are as following. 1. The calm length of the winter wheat was highest under 12hrs daylength, while that of the spring wheat was highest under 8hrs daylength. Standard errors of culm length was larger under 12 and 8hrs daylength than that of 24hrs daylength condition. 2. The culm length was shortest under the 24hrs daylength compare to under 12 or 8hrs while it was highest under 12hrs. Short and medium culm length varieties were photo insensitive but those of long culm length were photo sensitive. 3. There are many types of varietal differences for the culm length under the daylength conditions. Highest culm length group under 12 and 8hrs contition was classified. The semi-dwarf varieties that did not change their plant heights under 8 and 12hrs conditions were Hira, Yecora Resel, Sava, Sturdy, Saric 70, Sekidorisai 66 etc. 4. Varietal difference of culm elongation was noticed between 8hrs and 12hrs daylength condition. On the basis of the evidences obtained from this experiment, it may be concluded that the genetic studies related to culm length should be carried out under the most favorable conditions for calm elongation. 5. Correlation coefficients estimated between culm length and heading or maturity were negative but insignificant, but their correlations were highly significant between photo treatments. 6. Calm length of F₁ was intermediate to the range of F₂ population which seems to be distributed normally. In this regard the gene involved with calm length seemingly inherit additively. Statistical analysis for the involved genes for calm length suggested 2 genes for the semidwarf variety Robin #2 was more or less 2 genes.

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).

自殖性作物에 있어서 Isogenic line과 Multiline의 育成과 利用

C.H. CHO(曺章換),K.W. CHUNG(鄭吉雄),J.W. SHIM(沈載昱),D.J. MAENG(孟敦在) 한국육종학회 1981 한국육종학회지 Vol.13 No.2

小麥 主要形質의 遺傳 및 選拔效果에 關한 硏究 第1報 小麥의 出穗期 遺傳 및 遺傳率의 地域的 變動

C. H. CHO(曺章煥),B. K. KIM(金鳳九),Y. W. HA(河龍雄),J. H. NAM(南重鉉) 한국육종학회 1979 한국육종학회지 Vol.11 No.1

Segreating F₂ populations of seven wheat crosses were planted in Suweon and in Muan to investigate the regional variations in inheritance and heritabilities of heading date. Among seven F₂ populations, the crosses Chugoku 81×Centurk and Suweon 197× Chugoku 81 gave a 3:1 early to late ratios in F₂ suggesting a single dominant early gene in Chugoku 81. The cross Norin 16×Kanto 75 gave a 7:9 early to late ratio suggesting complementary gene action with lateness dominant. The crosses Strampelli× Chokwang and Suweon 197×Sinkwang gave a 9:7 early to late ratios suggesting complementary genes action with earliness dominant. The crosses Namkwang×Suweon 215 and Norin 4×Bezostaya gave a 1:15 ratio to suggesting duplicate gene action where lateness in dominant. Heading period of the F₂ population in northern Korea teas shorter than that in southern Korea. Broad sense heritabilites in the northern area were lower than that in the southern areas.