‘Sangbo’ is a japonica rice (
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.
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‘Yeongbo’ is a variety of japonica rice (
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Rice stripe virus (RSV) is one of the major constraints in rice production which is transmitted by the small brown plant hopper,
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Rice production is largely affected by various environmental conditions such as cold, heat and flooding. Here, to identify cold tolerant QTLs at seedling stage in rice, we generated RIL population derived from a cross between Hanareum 2 and Unkwang which are a highly cold sensitive and cold tolerant, respectively. We observed cold phenotype of this population in the growth chamber conditions and natural field conditions. For observation of cold tolerant phenotype of RIL population in the growth chamber, we treated cold stress (5~13°C) for 14 days and recovery for 4 days. When we examined the phenotype of RIL in the field conditions, temperature range in the field conditions was about 6 to 25°C in 2015~2016. We named QTLs as Seedling Cold Tolerant (SCT) in growth chamber and Cold induced Yellowing Tolerant (CYT) in the field, respectively. Three QTLs for SCT and 5 QTLs for CYT were detected on chromosome 1, 6, 7, 8, 10, 11 and 12. Among these QTLs,
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This study was conducted to analyze the starch and pasting properties of fourteen glutinous rice varieties with different maturity, and we compared the textural characteristic difference in relation to stickiness of glutinous rice cake. The whiteness values of grain appearance showed significantly differences in the order of early < medium < mid-late maturing glutinous rice varieties. Early maturing glutinous rice varieties exhibited a little high tendency for crude protein content than that of other varieties. Mid-late glutinous rice varieties showed higher of short chain ratio of 6 to 12 in DP of amylopectin whereas, medium length chains of 13 to 24 were significantly low. According to Rapid Visco-Analyzer measurement glutinous rice flours and starches, peak time showed high negative correlation with short chains of 6 to 12 in DP. The hardness of mid-late maturing glutinous rice cake was distinctly lower than that of the other glutinous rice varieties. Furthermore, mid-late maturing glutinous rice varieties,
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A rice variety ‘Dabo‘ is a japonica rice (
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A rice variety ‘Daebo’ is a japonica rice (Oryza sativa L.) with good eating quality, lodging tolerance, and resistance to rice stripe virus (RSV) and blight bacterial disease (BB). It is developed by the rice breeding team of Yeongdeog Substation, National Institute Crop Science, RDA in 2011. This variety derived from a cross between ‘YR21247-68-1’ with good plant type and ‘Yeongdeog35’ with good eating quality conducted in 2002 summer season. A promising line, YR23940-B-17-1-2, selected by bulk and pedigree breeding method was designated as the name of ‘Yeongdeog51’ in 2008. After the local adaptability test was carried out at seven locations from 2009 to 2011, ‘Yeongdeog51’ was released as the name of ‘Daebo’ in 2011. ‘Daebo’ is short culm length as 63 cm and medium-growth duration. This variety is resistant to races, K1, K2, and K3 of bacterial blight and stripe virus and moderately resistant to leaf blast disease resistance. ‘Daebo’ has translucent and clear milled rice kernel without white core and belly rice, and good eating quality as a result of panel test. The yield potential of ‘Daebo’ in milled rice is about 5.93 MT/ha at ordinary fertilizer level of local adaptability test. This cultivar would be adaptable to middle plain, south plain, mid-west costal area, and south mid-mountainous area.
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