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고온조건에서 등숙이 양호하고 도열병에 강한 조생 고품질 벼 ‘중모1024’ 육성
정지웅(Ji-Ung Jeung),강경호(Young-Seop Shin),최임수(Im-Soo Choi),장재기(Jae-Ki Chang),김명기(Myeong-Ki Kim),이점호(Jeom-Ho Lee),박향미(Hyang-Mi Park),양창인(Chang-Ihn Yang),전용희(Yong-Hee Jeon),서정필(Jung-Pil Suh),최인배(In-Bae Cho 한국육종학회 2016 한국육종학회지 Vol.48 No.1
‘Jungmo1024’ is a blast resistant early maturing rice cultivar with high temperature tolerance during grain filling stage. ‘Jungmo1024’ was derived from a sodium azide treatment on ‘Suweon472’, a high yielding japonica elite line which was latterly registered as ‘Namil’. Comparison with the agronomical traits of ‘Namil’, ‘Jungmo1024’ was uniquely characterized as the induced gained function due to the reduced culm length, increased tiller number, strong blast resistance and especially high temperature tolerance during grain filling stage. The high temperature tolerance of ‘Jungmo1024’ was supported by two years experiments by comparing the head rice ratio produced in ordinary paddy field and green house condition. The heading date of ‘Jungmo1024’ was July 29 in central plain area, which was 9 days earlier than that of ‘Hwaseong’. The milled rice yield performance of ‘Jungmo1024’ was about 4.98 MT/ha in local adaptability test for three years. ‘Jungmo1024’ had 69 cm in culm length, which was 15 cm shorter than that of ‘Hwaseong’, 20 cm in panicle length, 16 in tiller number, and 22.3g in 1,000 grain-weight of brown rice. ‘Jungmo1024’ exhibited strong rice blast resistance, but do not have any clear resistance gene sources against bacterial blight, viral diseases and insect fests. ‘Jungmo1024’, nevertheless, would be a useful rice cultivar could be used as a donor line for the breeding programs for developing southern plane adaptable early maturing rice cultivars with enhanced rice blast resistance, lodging tolerance, and especially high temperature tolerance during grain filling stage.
남일 돌연변이 후대계통 Namil(EMS)-bl10,bph1의 도열병 및 벼멸구 저항성에 대한 유전분석
조성우(Seong-Woo Cho),정지웅(Ji-Ung Jeung),신영섭(Young-Seop Shin),강경호(Kyung-Ho Kang),이상복(Sang-Bok Lee),김보경(Bo-Kyeong Kim) 한국육종학회 2014 한국육종학회지 Vol.46 No.3
Rice is a source of food supply as the staple food. The narrow genetic diversity of Korean Japonica cultivars is prone to be susceptible to abiotic and biotic stresses such as rice blast, bacterial blight, and brown planthopper (BPH). The best approach for prevention of the breeding and extermination of disease and insect pest would be the development of rice cultivars harboring multiple disease and insect pest resistance genes. National Institute of Crop Science (NICS) in Korea developed a mutant line, Namil(EMS)-bl10,bph1, by using ethyl-methane-sulfonate (EMS) as the chemical mutagen on the wild type, Namil. The mutant line exhibits strong resistance levels against rice blast and brown planthopper. To localize favorable mutated allele types, two mapping populations were constructed by using F2 progenies derives crosses between Namil(EMS)-bl10,bph1 andMilyang23 and Namil (wild type) and Milyang23. Each F2 progenies were evaluated in terms of DNA marker genotype as well as agronomic traits measured, and for rice blast and BPH resistance, virulent blast isolate 94-254 and Korean biotype of BPH were used to screen F2:3 seedlings to conduct association analysis between marker genotype and evaluated phenotype of progeny lines. Through comparisons on major loci between two mapping populations, the putative major loci for rice blast resistance (RM1337, R2=54.4%) and BPH (RM0277, R2=55.1%) were primarily localized on chromosome 12.
벼의 arginine decarboxylase DNA clone 의 재조합 및 염기서열 분석
홍성회(Sung Hoi Hong),신정섭(Jeong Sheop Shin),정지웅(Ji Ung Jeung),옥승한(Sung Han Ok) 한국응용생명화학회 1996 Applied Biological Chemistry (Appl Biol Chem) Vol.39 No.2
Arginine decarboxylase (ADC) is the first enzyme in one of the two pathways of diamine putrescine biosynthesis in plants. The genes encoding ADC have previously been cloned from Escherichia coli, oat and tomato genome. Two degenerate oligonucleotides (17-mer) corresponding to two conserved regions of ADC were used as primers in polymerase chain reaction of rice (Oryza sativa L.) genomic DNA, and an approximately 1.0 kbp fragment was obtained. This amplified PCR product showed an open reading frame which contains 1,022 by of nucleotide sequences. This PCR product was cloned into pGEM-originated T vector anti the short 500 by Pst1 digested fragment was subcloned into pGEM-3zf(+/-) vectors to facilitate sequencing. The nucleotide sequence of this PCR product showed about 74% and 70% identity with the same regions of the oat and tomato ADC cDNA sequences, respectively. The predicted .amino acid sequence exhibited 45% and 62% identity with oat and tomato ADC polypeptide fragments, respectively. The sequence similarities of 34%, 47%n and 38% were previously reported in oat and E. coli, tomato ;md oat, and tomato and E. coli ADC amino acids, respectively. Therefore, similarities and identities between rice and oat or tomato are remarkably higher than those others of the previous reports. In the highly conserved regions in both the amino acid sequence and spacing regions among the sequences of these three, rice ADC open reading frame also has the exactly same regions with the striking similarity. RNA blot analysis showed that ADC is expressed as a transcript of approximately 2.5 kbp in the rice seedling leaf tissues.
이현숙(Hyun-Sook Lee),하수경(Su-Kyung Ha),이창민(Chang-Min Lee),박현수(Hyun-Su Park),정지웅(Ji-Ung Jeung) 한국육종학회 2022 한국육종학회지 Vol.54 No.4
Rice blast is one of the most serious agricultural diseases in the world. Rice blast can be managed using low nitrogen fertilizers, treatment with chemical fungicides, and the most effective resistant varieties. Many genetic resources have been investigated and used along with molecular markers to breed blast-resistant rice varieties. In this study, the genetic diversity of blast resistance genes using 27 functional/linked markers and rice blast incidence over three years was investigated in 296 Korean rice varieties. Blast incidence was determined using a 0-9 scoring system (0=no lesions to 9=dead leaves) in nursery tests. The blast incidence of 296 rice varieties showed a significant correlation between years (r>0.64, p<0.001). The 261 Japonica varieties showed blast resistance compared to 114 mid-late maturing varieties or 96 medium-maturing varieties. 35 Tongil-type varieties also exhibited greater resistance than Japonica varieties. DNA marker-trait association analysis was conducted using 27 DNA markers linked to 19 blast resistance genes. Twelve DNA markers showed significant associations with the average blast incidence over 3 years. The ‘9871.T7E’ marker linked with Pi40 was strongly associated with blast disease, with a phenotypic variance of 24% over 3 years (p<0.001). Among the varieties harboring the Pi40 allele, early maturing varieties accounted for 87%. These results imply that the blast resistance of early maturing Korean varieties is associated with the Pi40 gene. These results will be beneficial for breeding blast-resistant rice in Korea.
벼 단인자 계통과 우량 벼품종의 도열병 저항성 분석을 통한 안정 저항성 유전자 탐색
백만기(Man-Kee Baek),박현수(Hyun-Su Park),이창민(Chang-Min Lee),이효정(Hyo-Jeong Lee),정종민(Jong-Min Jeong),안억근(Eok-Keun Ahn),현웅조(Wong-Jo Hyun),이지윤(Ji-Yoon Lee),정오영(O-Young Jeong),정지웅(Ji-Ung Jeung),이점호(Jeom-Ho Lee) 한국육종학회 2021 한국육종학회지 Vol.53 No.3
Rice is the most important staple food in Korea. Rice blast, caused by Magnaporthe oryzae, is one of the most devastating diseasesin the rice-growing world and in Korea. Eighteen major blast resistance genes were screened in 33 leading Korean japonica varieties using44 DNA markers. The 33 leading japonica varieties are cultivated in 659,642 ha (90.4%), and a variety of Samkwang is cultivated widelyon a nation-wide scale. Four resistance genes, Pia, Pib, Pi19, and Pb1, were detected in 10-21 varieties, and the R-genes of Pii, Pish, Pita/Pita-2,Piz/Piz-t, Pi35, and Pi65(t), were present in 2-5 varieties. Five R-genes, Pit, Pi5, Pi9, pi21, and Pi40, were not detected in the Korean japonicarice varieties. A total of six varieties, two mid-late flowering varieties, Ilmi and Saeilmi, a medium flowering variety Gopum; and three earlyflowering varieties Jopyeong, Haedamssal, and Haedeul; were resistant to blast nursery screening over 12 years. A variety of Gopum harboredalleles for Piz/Piz-t, and three early flowering varieties, Jopyeong, Haedamssal, and Haedeul, had extensive loci of the multiple-gene familyPiz/Piz-t, Pi9, and Pi40 on chromosome 6. Two mid-late flowering varieties, Ilmi and Saeilmi, harbored the Pita-2 gene, and Gopum hadPita. In the japonica rice breeding program, an effective means for enhancing stable resistance to blast will be to introduce resistance genesPit, Pi5, Pi9, pi21 and Pi40 which were not identified in Korean japonica rice varieties, and resistance genes Pita/Pita-2, Piz-t/Piz-5, to 2-3R genes among and Pi20 that showed stable resistance in monogenic IRBL lines.
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.
벼 생태형별 아프리카인의 쌀 외관품질 및 밥맛 선호도 평가
이점식 ( Jeom Sig Lee ),이정희 ( Jeong Heui Lee ),윤미라 ( Mi Ra Yoon ),곽지은 ( Jieun Kwak ),천아름 ( Areum Chun ),강경호 ( Kyung Ho Kang ),정지웅 ( Ji Ung Jeung ),전재범 ( Jaebuhm Chun ),김보경 ( Bo Kyeong Kim ) 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.3
The objective of this study was to evaluate grain appearance and cooked rice taste preferred by Africans for the rice ecotype of one Japonica variety, one Indica variety, and two varieties of Tongil type as compared with Korean’s preference. The preferred grain appearance by Africans who have participated as panelists was in the order of grain length, aroma, and shape, while Korean preferred rice quality in the order of appearance(head rice) and grain length. Africans preferred imported Indica rice from Thailand the most, while Korean preferred Japonica Haimi the most. Overall, African preferred aromatic rice with long grain, while Korean preferred short grain rice with high head rice ratio. In the evaluation of cooked rice taste, there was no significant statistical difference between varieties preferred by Africans. Whereas, Koreans showed clear preference in the order of Haiami > Dasan 1 = Hanareum > Indica rice. The preference analysis results of cooked rice taste subjected to Japonica and Indica which showed clear preference by Koreans revealed that Africans from Cameroon, DR Congo, and Tanzania preferred Haimai. Meanwhile, the Africans from Uganda, Mali, and Nigeria preferred imported Indica rice from Thailand. The Africans from Kenya, Malawi, Ghana, and Sudan showed similar preference among Japonica and Indica varieties. The study results indicated that Africans had different preference of cooked rice taste for eco-type rice varieties by different nations. It is regarded that additional research would be conducted to evaluate cooked rice taste by the appropriate numbers of panelists from various field and by the various rice varieties including rice variety preferred by different African countries.
생육기간이 짧고 수당립수가 많은 자포니카 조생 사료용 벼 ‘조농’
박현수(Hyun-Su Park),백만기(Man-Kee Baek),김우재(Woo-Jae Kim),김정주(Jeong-Ju Kim),정종민(Jong-Min Jeong),조영찬(Young-Chan Cho),고종철(Jong-Cheol Ko),정지웅(Ji-Ung Jeung),정오영(O-Young Jeong),이창민(Chang-Min Lee),김석만(Suk-Man Ki 한국육종학회 2021 한국육종학회지 Vol.53 No.3
‘Jonong’ is an early maturing whole crop silage (WCS) japonica rice cultivar characterized by a short growth duration and numerousspikelets. It was developed to enhance the adaptability of WCS rice to double-cropping systems. ‘Jonong’ is derived from a cross between‘Binhae Col.#1’ and ‘Deuraechan’; ‘Binhae Col.#1’ is a semi-early maturing China rice germplasm with numerous spikelets on dense panicles,whereas ‘Deuraechan’ is a high-yielding japonica rice cultivar with numerous spikelets on long panicles. To diversify the genetic variationand shorten the breeding period, an anther culture method was applied to the F₁ plants. ‘Jonong’ was selected through the pedigree method,yield trials, and local adaptability tests, with a high selection pressure for short growth duration and high biomass. The average heading dateof ‘Jonong’ was August 1st, which is 11 days earlier than that of ‘Nokyang’, the standard cultivar for WCS rice. Moreover, the growth durationof ‘Jonong’ is the shortest among all Korean WCS rice cultivars. The culm length of ‘Jonong’ is 88 cm, which 4 cm longer than that of‘Nokyang’ and the highest among all Korean early maturing rice cultivars. ‘Jonong’ has 149 spikelets per panicle, which is 30 more thanthat of ‘Nokyang’, and is the highest among all Korean early maturing rice cultivars. ‘Jonong’ exhibits stable premature heading and is tolerantto lodging. It is moderately resistant to leaf blast and resistant to the rice stripe virus. The feed value of ‘Jonong’ in terms of total digestiblenutrients is good and comparable to that of ‘Nokyang’. Furthermore, compared with ‘Nokyang’, ‘Jonong’ shows a similar level of dry matteryield and a higher rough rice yield. Therefore, ‘Jonong’, an early maturing WCS japonica rice with short growth duration and numerousspikelets, would be suitable for cultivating in winter forage crop-rice double cropping systems (Registration No. 7274).