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Young Chan Cho(曺永璨),Hak Soo Suh(徐學洙) 한국육종학회 1989 한국육종학회지 Vol.21 No.2
In order to test varietal compatibility, 76 Japonica varieties were crossed to the Tongil type test varieties, Gayabyeo and Milyang 42, and 59 Tongil type or Indica varieties were crossed to the japonica test varieties, Samnambyeo and Milyang 74. Two wild rices, WSP 624 and O. nivara/O. sativa, were crossed to the above four testers. After growing the F₁ plants, the pollen and spikelet fertility were tested. The Tongil type tester Gayabyeo showed relatively high compatibility to the Japonica varieties, however, Milyang 42 showed low compatibility to those. Among the Japonica varieties tested, Nagoyudaka, Gou 1 and Gou 2 were relatively high compatible to Tongil type testers. The Japonica testers Samnambyeo and Milyang 74 did not show high compatibility to Tongil type or Indica varieties. The rice varieties Dourado Precose from Brazil, Huan-Sen-Goo from Taiwan, Kataktara DA 2 from Bangladesh, Azucena from Philippines, NP 125 and Dular from India, TOX 1785 from IITA, Dawn and Zenith from USA were highly compatible to the Japonica testers, Samnambyeo and Milyang 74. The Tongil type variety Gayabyeo was highly Compatible to the wild rices tested.
조영찬(Young-Chan Cho),백만기(Man-Kee Baek),박현수(Hyun-Su Park),조준현(Jun-Hyun Cho),안억근(Eok-Keun Ahn),서정필(Jung-Pil Suh),정지웅(Ji-Ung Jeung),이종희(Jong-Hee Lee),원용재(Yong-Jae Won),송유천(Yoo-Chun Song),정응기(Eung-Gi Jeong 한국육종학회 2020 한국육종학회지 Vol.52 No.S
Rice research in Korea during the past 100 years has gone through tremendous changes and improvements as the country underwent a turbulent history of transformation. Full-scale R&D modernization began in the 1970s, when the government focused policy on achieving self-sufficiency in rice in order to establish the foundation for national economic growth. A major landmark was reached by the development of the rice variety “Tongil” and its cultivation technology, which was at the core of the unprecedented Korean “Green Revolution”. Since achieving self-sufficiency in rice, the breeding goal of Korea moved from increasing yield to improving grain quality as more consumers began to seek high quality food products in the 1980s. This change led to the establishment of the high quality rice breeding platform for enhancing the global competitiveness of Korean rice to cope with the opening of domestic rice market in the 2000s. Currently, the major breeding goals in rice are developing premium quality cultivars for table rice and specialized cultivars for boosting processed food industry. To date, the National Institute of Crop Science has released a total of 300 rice cultivars, including 202 table rice and 98 specialized usage cultivars. Diverse technologies have been developed and utilized for breeding new rice cultivars to meet changing needs. In the next 100 years of rice breeding, the convergence of traditional crop improvement technologies and the new breeding technologies utilizing recent advances in biotechnology will play a crucial role in enhancing breeding efficiency.
Inheritance of resistance to blast(Pyricularia grisea Sacc.) in Korean weedy rice(Oryza sativa L.)
Young Chan Cho(曺永璨),Im Soo Choi(崔林守),Seong Sook Han(韓聖淑),Young Seop Shin(申榮燮),Huhn Pal Moon(文憲八),Hak Soo Suh(徐學洙) 한국육종학회 1996 한국육종학회지 Vol.28 No.3
The blast resistance of 24 accessions of Korean weedy rice was evaluated using eleven Korean blast fungus races. Three accessions which showed resistant to all the blast races tested were crossed with Nagdongbyeo which showed susceptible to blast and late heading. Inheritance of resistance to blast and linkage relationship between blast resistance and heading time were studied using KJ-101, KJ-301, KI-197 and KI-409 races in F₂ and BC₁F₁ populations. Geumleungaengmi 33, Kanghwaaengmi 11 and Ssalsharei of short grain Korean weedy rice were resistant to all eleven blast races used. Geochangaengmi 12 of short grain type and Guryeaengmi 9 of long grain type were resistant to ten blast races. The resistance to four blast fungus races was found to be controlled by two dominant genes in Geumleungaengmi 33, four dominant genes in Geochangaengmi 12, and one dominant gene in Ssalsharei. The linkage relationship was found between the resistance gene of Geumleungaengmi 33 to KJ-101 race and the late heading with recombination value of 23.0±.4.0%.
Young Chan Cho(曺永璨),Tae Young Chung(鄭泰英),Yong Hwan Park(朴用煥),Hak Soo Suh(徐學洙) 한국육종학회 1995 한국육종학회지 Vol.27 No.1
Genetic variation and phylogenetic relationship among twenty four strains of Korean red rice, one foreign red rice and five cultivars (Oryza sativa L.) were investigated at the DNA level by using randomly amplified polymorphic DNA (RAPD) method. Twenty of 23 10-mer primers assayed, produced strong and reproducible DNA bands. The number of amplified bands from each 10-mer primer varied from 2 to 8, with an average of 5.3 bands per primer. However, an average of 0.5 band per primer was polymorphic between a Korean red rice strain and a japonica cultivar. Out of 103 different bands observed among thirty accessions by using fifteen primers, 85(82.5%) were informative to differentiate one or more accessions for the others. Particularly, many polymorphic bands were detected among accessions which detected few polymorphism by RFLP analysis. A dendrogram of the phylogenetic similarities among thirty Korean red rices and cultivars was constructed based on their DNA polymorphisms. Classification of rice accessions based on the results from RAPD analysis was differentiated into two main groups, short grain red rices which include japonica cultivars and long grain red rices which include indica and Tongil-type cultivars. This result was in accordance with previous classifications based on isozyme and RFLP analysis. From genetic analysis of F₁ and F₂ populations of a cross between a japonica cultivar, Nagdongbyeo and a Korean red rice strain with short grain type, Geumleungaengmi 33, RAPD polymorphic bands were dominant and inherited following the Mendelian ratio.