夏大豆型遺傳資源의 特性에 關한 硏究(Ⅰ)

K. W. Chung(鄭吉雄) 한국육종학회 1984 한국육종학회지 Vol.16 No.2

Two-hundred and ninty land races of summer type of soybeans collected throughout Kyong-ki and Choongnam areas in Korea and Japan were evaluated and classified for visual characteristics. Average number of days to initial flowering, fruiting, and maturity was 60, 66, and 126, and Changyoebkong was 74, 78, and 152 days, respectively. Average 126 days of maturity and 152 days was corresponded to 27 August and 22 September, respectively. Sixty-four lines were identified one month earlier in maturity than Changyoebkong. White flowered lines were 275, which was 95% of 290 lines. Summer type of soybeans showed shorter stem length, smaller number of main stem internodes, smaller air-dry weight of main stem and branches, and lower grain weight per plant than Changyoebkong. These indicates that summer type is generally lower yielding capacity. Average 100-grain weight was 27.3 gr. There were 18 lines ranged 12 to 15 gr. of 100-grain weight, and 28 lines ranged 32 to 35 gr. Eighty seven percent of lines showed yellow or whitish-yellow seed coat, 7.7% of lines had black coat. Yellow-saddle-patterned were 8 lines, and 7 lines were light green. Eighty-four percent of lines had dark brown hilum color. Average infection rate to pod and stem blight (Diaporthe phaseolorum) was 25%. Thirty eight lines showed infection rate of less-than 10%. Average infection rate to purple stain(Cercospora kikuchii) was 12.8%. No infectious lines to purple stain were identified, and lower infectious lines to purple stain showed high infection to pod and stem blight.

小麥의 耐酸性簡易檢定方法과 品種間差異

B.K. KIM(金鳳九),K.W. CHUNG(鄭吉雄),J.C. CHAE(蔡濟天),J.J. HWANG(黃鐘辰) 한국육종학회 1982 한국육종학회지 Vol.14 No.3

To establish a simple method for testing varieties for aluminum tolerance and to screen the acid tolerant varieties, fifty wheat varieties and lines were grown in the experimental case with nutrient solutions containing the different Al concentration and days after 3~4 days at 20℃. The results showed that varietal differences were greatest in the nutrient solutions containing 0.6/mM Al and days after 3~4 days transplanted with sprouted seeds, and Atlas 66, Chokwang, Geurumil, Suweon 205, Naemil, Suweon 185, Suweon 89, and Changkwang were Al-tolerant.

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.

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

忠南西部 海岸地域 春蘭自生地의 地理的 및 生態的 特性과 自生春蘭의 生育相

朴奉圭,李武鉉,鄭吉雄 公州大學校 資源科學硏究所 1993 資源科學硏究論文集 Vol.1 No.-

These studies were carried out to investigate the distribution of wild Cymbidium verescens Lindl adapted in the west sea areas, Chung-nam, Korea, and to indentify the geological and ecological characteristics of habitated areas of C. verescens, and to observe some growth characteristics of C. verescens. Well-adapted areas were whole area of Anmyun island in Taean county, Busuk-myun in Seosan county, Seobu-myun in Hongsung county, and Chunbuk-myun, Ochun-myun, Jupo-myun, Namop-myun, Wungchun-myum and Jusan-myun in Poryung county. Wild C. verescens was much more observed in the sea shore areas that directions were East, West and South, and well adapted at special areas around valleies and reservoirs, where heavy accumulation of falling leaves was shown in the mountainous areas. Tall trees, Pinus densiflora and Quercus acutissima, were observed to dominate in the well-adapted areas of C.verescens, and density of short trees, shrubs, were shown average 34.3 plants in 25m²at mountain Jogae. The plant height of wild C.verescens was measured in average 38.5㎝ and below 1㎝ of leaf width. Pod length, diameter, fresh weight were shown 55.6±8.1㎜, 18.6±2.8㎜, and 4.70±1.52g, respectively. The seed was observed very small size, and its weight per pod was shown 432.1±202.9㎎. Yong shoot was directly emerged from rhizome tip, and occasionally after forming several nodes. The roots were observed to elongate well in the soil surface covered with leaves.

忠南地域 自生春蘭의 分布와 氣象要素

鄭吉雄,李武鉉,金榮七,朴奉圭 公州大學校 資源科學硏究所 1994 資源科學硏究論文集 Vol.2 No.-

忠南地域에 自生하고 있는 春蘭의 各 地域別 分布를 調査하고 氣象環境 중 自生春蘭에 影響을 주는 要因을 分析, 檢討하여 얻은 結果를 要約하면 다음과 같다. 1. 自生春蘭의 分布가 많은 地域은 安眠島를 中心으로 하여 保寧, 泰安, 瑞山, 洪城地域 順이었고, 內陸地域인 靑陽, 禮山地域도 比較的 分布가 많았으며 점차 그 分布가 擴大되고 있는 傾向이었다. 2. 春蘭 自生에 가장 크게 影響을 주는 氣象要素인 1월 중순 最低平均氣溫은 海岸地域인 瑞山과 大川이 各各 -6.8℃, -6.6℃로 內陸地域인 錦山, 儒城의 -8.8℃, -9.6℃보다 높게 나타났고, -8℃以下의 異積日數는 瑞山, 大川이 1∼2일인데 비하여 錦山, 儒城은 30日 以上이 었으며, 春蘭自生의 限界溫度는 -8℃ 程度로 推定된다. 3. 平均 風速은 瑞山이 2.28m/s로 錦山 1.34m/s보다 빠르게 나타났다. 4. 氣象要素중 最低溫度은 平均 및 最高氣溫, 相對濕度, 蒸氣壓, 구름量, 降水量, 蒸發量 등에 正의 相關關係가 있었고, 日較差와는 負의 相關關係를 나타냈다. 5. 自生春蘭의 分布程度가 많은 地域은 保寧, 泰安, 瑞山, 洪城, 舒川 順이었고, 內陸地域인 錦山, 燕崎, 論山地域은 거의 分布하지 않았다. 6. 各 地域別로 自生春蘭의 分布程度는 忠南地域 緯度와의 相關關係는 認定할 수 없었으나, 經度와는 -0.329**(n=172, p<0.01)로 負의 相關關係를 나타내었다 These studies were carried out to investigate the distribution of wild Cymbidium virescens Lindl in Chung-nam, Korea, and to analyse the meteorological elements among locations where have local meteorological observatory. Well-adapted areas of C. virescens were Anmyun island, Poryeong, Taean, Seosan, Hongseong in the west sea area. In the location with mountainous area, adapted areas of C. virescens were Cheongyang, Yesan and its distributions much more increased. Minimum air temperature of mid-January, an important meteorological element of limitation factor on habitat of C. virescens, were higher Seosan and Taechun observed -6.8℃, -6.6℃ respectively than Keumsan and Yuseong observed -8.8℃, -9.6℃repectively. Sum of days below -8℃ were calculated 1 to 2 days at Secosan and Tachun, and were calculated more 30 days at Keumsan and Yuseong. Limited minimum air temperature of mid-January on habitat of C. virescens were predicted -8℃. Average wind speed was more fast Seosan observed 2.28m/s than Keumsan observed 1.34m/s. Minimum air temperature was signification of positive correlation coefficient among average and maximum air temperature, relative humidity, vapour pressure, cloud cover, precipitation, evaporation, but negative correlation coefficient about diurnal change. The locations of densely habitat degree were observed Poryeong, Taean, Seosan Hongseong and Seochun located in the west sea areas. Keumsan, Yeongi and Nonsan located in the mounatainous areas were not or nearly habitat of C. virescens. The latitudinal habitat degree of C. virescens was very signification of correlation coefficient calculated -0.329**(n=172, p < 0.01) but the longitudinal habitat degree was not signification of correlation coefficient.

호밀의 품종 및 수확시기가 사초생산성 및 품질에 미치는 영향

이병생,김종덕,권찬호,정길웅 한국동물자원과학회 2004 한국축산학회지 Vol.46 No.2

This experiment was conducted at Cheonan Yonam Experimental Livestock Farm in 2001~2002 to determine the effect of harvest date(20 April, 26 April and 4 May) on forage yield and quality of rye varieties of three different maturing groups(early maturing variety = "Koolgrazer", midseason maturing variety = "Homil22" and late maturing variety = "Danko"). The heading date of Koolgrazer, Homil22 and Danko were 17, 22 and 19 April, respectively. Dry matter percentage increased from 15.6 to 21.6% as the harvest date was delayed from April 20 to May 4. Among the rye varieties tested, dry matter percentage of Koolgrazer, Homil22 and Danko were 20.9, 18.8 and 16.3%, respectively. Dry matter yield increased from 11.2 to 13.9 ton/ha as the harvest date was delayed, but no significant difference among rye varieties. As the harvest date was delayed, total digestible nutrients(TDN) yield also increased significantly from 704 to 8.4 ton/ha. However no significant difference was found among rye varieties. Crude protein(CP) percentage decreased from 20.3 to 17.1% as the harvest date was delayed, and CP percentage of late maturing variety, Danko, was significantly higher than that of the other varieties. In content of fiber component(NDF, ADF, ADL, hemicellulose and cellulose) of rye, the late harvest date(4 May) showed the highest among harvest dates. From comparison within rye varieties tested, Koolgrazer, a early maturing variety had higher than a midseason and late maturing varieties, Homill22 and Danko. The cellulase digestible of organic matter of dry matter(CDOMD) decreased as the harvest date was delayed. Among the rye varieties tested, the CDOMD of a early maturing variety, Koolgrazer was the lowest. Our study differences of winter rye in forage yield and quality resulting from variety maturity and harvest stage. A early maturing variety, Koolgrazer should be harvested between 24 and 28 April, Homill 22(midseason maturing variety) harvested between 29 April and 3 May, Danko(late maturing variety) harvested between 4 and 8 May for maximum forage yield and optimum quality.