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Hae Chune Choi,Yeon Gyu Kim,Ha Cheol Hong,Hung Goo Hwang,Sang Nag Ahn,Seong Sook Han,Jae Dang Ryu,Huhn Pal Moon 한국육종학회 2006 한국육종학회지 Vol.38 No.2
To ensure the durability of resistance to blast disease in high-quality japonica rice a long-term rice breeding project to develop a few blast-resistant multiline cultivars was carried out from 1987 to 1999. Seven resistance donors were selected based on
A New High-Quality, Lodging Tolerant and High-Yielding Rice Cultivar "Jinpumbyeo"
Hae Chune Choi,Yeon Gyu Kim,Ha Cheol Hong,Hung Goo Hwang,Huhn Pal Moon,Sang Nag Ahn,Young Seop Shin,Jeom Ho Lee,Kuk Hyun Jung,Hong Yeol Kim,Sae June Yang,Young Chan Cho,Soo Yeon Cho 한국육종학회 2003 한국육종학회지 Vol.35 No.4
“Jinpumbyeo” is a new japonica rice cultivar developed from a cross between lodging tolerant semi-dwarf plant type, SR14703-60-5-GH1 and high eating quality cultivar Suweon353 by the rice breeding team of National Crop Experiment Station, RDA made in 1987
A New Bacterial Blight Resistant, High-Quality Cultivar, "Seogjeongbyeo" Adaptable to Reclaimed Area
Hae Chune Choi,Hung Goo Hwang,Ha Cheol Hong,Yeon Gyu Kim,Hong Yeol Kim,Moon Tae Song,Yong Hwan Choi,Chang In Yang,Jong Doo Yea,Young Chan Cho,Man Kee Baek,Eung Gi Jeong,O Young Jeon 한국육종학회 2005 한국육종학회지 Vol.37 No.3
Hae Chune Choi,Yong Hee Son,Soo Yeon Cho 韓國作物學會 1993 Korean journal of crop science Vol.38 No.1
자동분석기(Rapid Ftow Autoanalyzer) RF A-300을 이용한 쌀의 아밀로스 분석법을 확립하였다. 자동분석기로 분석한 아밀로스 함량을 Williams나 Juliano 등의 방법에 따른 분석결과와 비교하여 본 결과 매우 높은 직선적인 상관관계 (r=0.95**-0.97**)를 나타내었다. 자동분석기를 이용한 분석법으로 얻어진 아밀로스함량은 Juliano등의 분석법에 의해 얻어진 결과에 비해 저·중 아밀로스 품종에서는 1.0-2.0%가 높게, 고 아밀로스품종에서는 1%정도 낮게 측정된 반면 Williams등의 분석법에 따른 검정결과에 비해서는 2.0-5.0% 정도로 높은 함량을 나타내었는데 검정치가 저 아밀로스품종 쪽일수록 증가정도가 약간 큰 경향이었다. 세가지 분석방법간에 상호 직선적인 상관을 보이면서 쌀가루에 비해 녹말시료에서 아밀로스함량이 약간 높은 경향이었다. Several trials and errors were repeated to develop a simplified recipe of amylose analysis using a Rapid Flow Autoanalyzer(Alpkem, RFA-300). The amylose content of rice samples analyzed by the Rapid Flow Autoanalyzer were compared with those of Williams’ and Juliano’s assay. The results by the simplified recipe of RFA amylose analysis were highly correlated with those by Williams’ and Juliano’s method(r=0.95** -0.97** ). The relative amylose content of defatted rice starch was higher than those of non-defatted rice flour, showing very close correlations between those analyzed by three method.
Hae Chune Choi(崔海椿),Ha Cheol Hong(洪夏鐵),Baek Hie Nahm(南佰熙) 한국육종학회 1997 한국육종학회지 Vol.29 No.1
To elucidate the major components of rice quality associated with the palatability in japonica, twelve japonica rice cultivars were examined for several physicochemical properties, endosperm structure of rice grain and physical characteristics or sensory palatability of cooked rice. The rice materials used showed narrow varietal variation in grain size and shape, alkali digestibility, gel consistency and amylose and protein contents, but considerable difference in appearance and texture of cooked rice in two years. Significant variations in varieties (V), harvested years (Y), and V x Y interaction were recognized in most of the physicochemical properties except alkali digestibility, volume expansion rate and texturogram of cooked rice. There was relatively larger coefficients of variation for both varieties and years in Mg/K ratio, iodine blue value of extracted solids and amounts of extracted solid matter during cooking, breakdown and setback viscosity, and short chain ratio of amylopectin. The physicochemical properties significantly associated with glossiness or global palatability score of cooked rice were the peak, hot paste and consistency viscosities of viscogram with year difference. The high-quality rice variety “Ilpumbyeo” showed less portion of amylose on the outer layer of milled rice grain and less and slower change in iodine blue value of extracted paste during twenty minutes of boiling. This highly palatable rice also exhibited very fine net structure in outer layer and fine-spongy and well-swollen shape of gelatinized starch granules in inner layer and core of cooked rice kernel compared with the poor palatable rice. Global sensory score of cooked rice could be estimated by multiple linear regression formula, deduced from relationship between rice quality components mentioned above and eating quality of cooked rice, with high probability of determination in two years. Inconsistent distribution of tested japonica rices over years on the plane of two integrated quality components indicated that there were some different high-quality rice types and those environmental response on grain quality was greatly different.
A Medium-maturing, Multi-Disease Resistant and High-Quality Rice Cultivar, "Sampyeongbyeo"
Hae Chune Choi,Hung Goo Hwang,Ha Cheol Hong,Yeon Gyu Kim,Chang In Yang,Young Chan Cho,Yong Hwan Choi,Sae Jun Yang,Hong Yeol Kim,Jong Doo Yea,Huhn Pal Moon,Soo Yeon Cho,Sang Nag Ahn 한국육종학회 2005 한국육종학회지 Vol.37 No.2
Hae Chune Choi,Ha Cheol Hong,Soo Yeon Cho 韓國作物學會 1999 Korean journal of crop science Vol.44 No.4
The experiments were carried out to elucidate the varietal variation of retrogradation in aged cooked rice and its association with some physicochemical properties of milled rice. The fifteen rice materials were selected from forty-three low-amylose japonica and Tongil-type rice cultivars based on palatability and retrogradation of cooked rice stratified by preliminary sensory evaluation of warm and cooled cooked rice. One japonica glutinous rice variety was included for comparison of retrogradation of cooked rice. The α -amylase-iodine method was adopted for checking the varietal difference in retrogradation of cooked rice. The desirable checking time for evaluating the varietal difference in deterioration of aged cooked rice was four hours after storing in room temperature and two hours after preserving in refrigerator based on the largest coefficients of variations in degree of retrogradation of cooked rice. The rice cultivars revealing the relatively slow retrogradation in aged cooked rice were Ilpumbyeo, Chucheongbyeo, Sasanishiki, Jinbubyeo and Koshihikari. A Tongil-type rice, Taebaegbyeo, and a japonica cultivar, Seomjinbyeo, showed the relatively fast deterioration of cooked rice. The retrogadation index represented by the percentage of retrogradation difference between warm and cooled cooked rice to original estimates of warm cooked rice was significantly affected by the degree of retrogradation of cooled cooked rice. Generally, the better rice cultivars in eating quality of cooked rice showed less retrogradation and much sponginess in cooled cooked rice. Also, the rice varieties exhibiting less retrogradation in cooled cooked rice revealed higher hot viscosity and lower cool viscosity of rice flour in amylogram. The sponginess of cooled cooked rice was closely associated with magnesium content and volume expansion of cooked rice. The hardness-changed ratio of cooked rice by cooling was negatively correlated with solids amount extracted during boiling and volume expansion of cooked rice. The major physicochemical properties of rice grain closely related to the palatability of cooked rice may be directly or indirectly associated with the retrogradation characteristics of cooked nce. The varietal difference in retrogradation of cooked rice can be effectively classified by scatter diagram on the plane of upper two principal components based on some retrogradation properties of cooked rice. The deteriorated structural change in cooled cooked rice by observing through the scanning electron microscope was more conspicuous in the fastly retrograded cooked rice than in the slower one.
벼 雄性不稔性을 利用한 集團改良에 관한 硏究 Ⅱ. 自然相互交雜 및 新遺傳子源 浸透交雜에 의한 集團循環改良 育種過程中 몇가지 量的形質의 變異
Hae Chune Choi(崔海椿),Soo Yeon Cho(趙守衍),Rae Kyeong Park(朴來敬) 한국육종학회 1988 한국육종학회지 Vol.20 No.2
This study was conducted to clarify the benefit of active recurrent improvement scheme of rice population and to find out the problems occured in process of recurrent random mating and introuduction of new germplasm into the basic populations using genetic male-sterile factor during 1978-1983. Once (NDR₁, NSR₁) and twice random-mating populations(NDR₂, NSR₂, and modified bulk F₄ populations of two crosses between male-sterile mutants of Nihonmasari(Nihonmasarims) and Suweon 223 or Suweon 235, and improved populations by penetrating outcross between male-sterile plants of NDR₂ or NSR₂ populations and Jinjubyeo or Samnambyeo(NDJ, NDS and/or NSJ, NSS) and their F₂ populations selected from male-fertile plants of NDJ and NSJ populations, and parental varieties included two male donors were investigated for phenotypic variations of some quantitative characters during 1984-1985. The modified bulk F₄, populations were derived from male-fertile F₂selections of two basic crosses and were maintained by single seed descent method(SSD). Although the genetic male sterility of Nihonmasariims was controlled by single recessive gene(msms), observed frequencies of male-sterile plants in once or twice random mating populations were remarkably decreased compared to expected ones. This phenomenon might be resulted from pleiotrophic effect of male-sterile gene such as inferiority of competition in vegetative growth and fertilization compared to normal one. The penetration ratio of new germplasm, calculated by the difference in frequencies of male-sterile plants between basic random mating and penerated mating populations under the natural condition of planting with alternative rows of the two populations, was about 11% as average of four different penerated mating populations varied from 2.1% to 16.2%. The male-sterile plants showed significantly shorter culm and panicle length, less tillers per plant, and less spikelets per panicle compared to normal fertile ones. Twice random mating population revealed significantly increased frequencies of tall, late heading, numerous spikelets and severely awned plants compared to once random mating population. Also, the former showed significantly less frequency of intermediate infections but more frequencies of resistant and susceptible plants to blast disease compared to the latter. This indicates that recurrent random-mating populations should be maintained with relatively desirable range of variations by discarding these undesirable recombinants. The NDJ, NDS, NSJ, and NSS populations manifested the significant change of distributions to the respective directions of earlier heading, shorter culm, longer panicle, more spikelets, less awning, more or less tiller, and more or less tolerance to blast or stripe virus diseases compared to the basic random-mating populations according to respective combinations between the basic populations and new donor parents. Also, these recurrently improved populations and random-mating populations presented wider variations of various agronomic characteristics compared with the modified bulk F₄ populations. These facts point out that the active recurrent improvement scheme using genic male-sterile factor as outcrossing carrier may be utilized effectively to accumulate the numerous gene sources together into a population and to increase the opportunity of continuous recombinations. The phenotypic correlations among some quantitative characters, except the association between panicle length and spikelet numbers per panicle, showed similar or considerably different tendency according to the populations due to different parental combinations and different breeding manipulations. Associations between the quantitative characters such as days to heading, culm length, panicle length, and number of spikelets per panicle, whose variations were largely changed by recombined variation, increased significantly according to random-mating times but decreased