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For QTL analysis of agronomic traits based on cultivation of low and high altitude locations, BC1 F5 181 lines were developed from a cross of Tongil type Gayabyeo and japonica Chhomrong originated from Nepal. Plant materials were grown in both of low altitude area of Milyang, Korea and high altitude area of Khumaltar, Nepal. In QTLs analysis, a total of 42 QTLs were detected in days to flowering, culm length, panicle length, number of panicles/hill, panicle exertion, and spikelet ripening ratio. Although many of the QTLs were coincided between the two locations of Korea and Nepal, several QTLs were revealed as location specific in high altitude area of Khumaltar. Especially, the regions harboring marker RM489-RM14281 on chromosome 3, RM5642-RM19049 on chromosome 5, and RM2854-RM6696 on chromosome 12 where QTLs were clustered and coincided between the two locations are considered as positive target regions for environmental independent traits. Furthermore, high rate of location specific QTLs such as panicle exertion and spikelet ripening ratio could be considered carefully for understanding the mechanism of cold tolerance based on cultivation of different altitude location. [ABSTRACT FROM AUTHOR]

A new rice variety 'Jungmo1009ho' is a japonica rice (Oryza sativa L.) with lodging tolerance and resistance to rice stripe virus (RSV) and blight bacterial disease (BLB) and good eating quality. It is developed by the rice breeding team of Yeongdeog Substation, National Institute Crop Science, RDA in 2009. This variety was derived from a cross between 'Iksan443' with good grain quality and 'Milyang165' with lodging tolerance conducted in 1999 summer season. A promising line, YR22207- 5-3-1-3, selected by pedigree breeding method was designated as 'Yeongdeog48' in 2006. After the local adaptability test was carried out at nine locations from 2007 to 2009, 'Yeongdeog48' was released as the name of 'Jungmo1009ho' in 2009. 'Jungmo1009ho' is very short culm length as 61cm and medium-late 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 with durable resistance, and also has tolerance to unfavorable environment such as cold and dried wind. 'Jungmo1009ho' 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 'Jungmo1009ho' in milled rice is about 5.47 MT/ha at ordinary fertilizer level of local adaptability test. This cultivar would be adaptable to east-south coastal cold salty wind and south mid-mountainous area. [ABSTRACT FROM AUTHOR]

Rice stripe disease, caused by rice stripe virus (RSV), is one of the major virus diseases in East Asia. This study was conducted to identify new resistance genetic source to Rice stripe disease. Genetic diversity of 155 rice cultivars was evaluated using 9 co-dominant InDel markers and 1 STS marker, ST10, near Stv-bi allele. These cultivars were classified into two groups by cluster analysis based on Nei's genetic distances. In comparison of bioassay for RSV resistance and genotyping using SSR markers showed that recombination value of RSV resistance and InDel7 marker type was 3.8%. Some RSV resistant varieties including umarat, Pervomajszkij, and Tung Ting Wan Hien 1 showed susceptable allele type in InDel7 and ST-10 marker. These results indicate those cultivars can be able to get the different gene resistance with Stv-bi gene. Further genetic studies on selected varieties in this study will be use for improving RSV resistance in japonica rice. [ABSTRACT FROM AUTHOR]

A new rice variety 'Dongbo' 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 2010. This variety derived from a cross between 'Yeongdeog19' with good grain quality and wind tolerance and 'Koshihikari' with good eating quality conducted in 1996 summer. A promising line, YR18320-21-1-1-2-2-2, selected by pedigree breeding method was designated as the name of 'Yeongdeog49' in 2007. After the local adaptability test was carried out at nine locations from 2008 to 2010, 'Yeongdeog49' was released as the name of 'Dongbo' in 2010. 'Dongbo' is short culm length as 71cm 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 with durable resistance, and also has tolerance to unfavorable environment such as cold and dried wind. 'Dongbo' 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 'Dongbo' in milled rice is about 5.71 MT/ha at ordinary fertilizer level of local adaptability test. This cultivar would be adaptable to middle plain, mid-west costal area, and south mid-mountainous area. [ABSTRACT FROM AUTHOR]

A new rice variety 'Jinbo' is a japonica rice (Oryza sativa L.) with good eating quality, lodging tolerance, and resistance to rice stripe virus (RSV) and bacterial blight disease (BB). It was developed by the rice breeding team of Yeongdeog Substation, National Institute of Crop Science (NICS), RDA in 2009. This variety was derived from a cross between 'Yeongdeog26' with good grain quality and wind tolerance and 'Koshihikari' with good eating quality in 1998 summer season. A promising line, YR21324-56-1-1, selected by pedigree breeding method, was designated as the name of 'Yeongdeog45' in 2005. After the local adaptability test was carried out at nine locations from 2006 to 2008, 'Yeongdeog45' was released as the name of 'Jinbo' in 2009. 'Jinbo' has short culm length as 74 cm and medium maturating growth duration. This variety is resistant to K1, K2 and K3 races of bacterial blight and stripe virus and moderately resistant to leaf blast disease with durable resistance, and also it has tolerance to unfavorable environments such as cold and dried wind. 'Jinbo' has translucent and clear milled rice kernel without white core and white belly rice, and good eating quality as a result of panel test. The yield potential of 'Jinbo' in milled rice is about 5.65 MT/ha at ordinary fertilizer level in local adaptability test. This cultivar would be adaptable to middle plain, mid-west costal area, east-south coastal area, and south mid-mountainous area. [ABSTRACT FROM AUTHOR]

A new commercial rice variety "Chilbo" is a japonica rice (Oryza sativa L.) with resistance to rice stripe virus and high grain quality. It was developed by the rice breeding team of Yeongdeog Substation, NICS, RDA in 2007. This variety was derived from a cross between "Yeongdeog 26" with wind tolerance and lodging resistance and "Koshihikari" with good grain quality. A promising line, YR21324-119-3-2 was selected by a pedigree breeding method and designated as "Yeongdeog 44" in 2004. Regional adaptation yield trials were carried out at eleven locations from 2005 to 2007. As a result, "Yeongdeog 44" was released as a high yielding rice variety with high grain qualilty and virus resistance with the name of "Chilbo". It is short 76cm in culm length and has medium-late growth duration. This variety is resistant to stripe virus and middle resistant to leaf blast disease. It is also tolerant to cold, dried wind. Milled rice kernel of "Chilbo" is translucent, clear in chalkiness. Panel test proved that and it has good eating quality. Head rice ratio of Chilbo is high compared to the check variety, Hwaseongbyeo. Yield potential of "Chilbo" in milled rice is about 5.57MT/ha at ordinary fertilizer level of local adaptability test. This variety would be adaptable to Yeongnam plain, south & east-south coastal, south mid-mountainous, middle plain area of Korean peninsula. [ABSTRACT FROM AUTHOR]