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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]