Search

The concern of high yielding variety decreased dramatically in farmer's field due to switch of high eating quality japonica varieties from Tongil type rice in late of 1990's. However, political and social issues of rice consumption promotion urged look for a high yielding varieties for cost down of raw materials in rice processing industries. 'Hanareum2' is a new high yielding Tongil type rice cultivar developed in 2010 derived from a cross of 'Milyang181' (Hanareumbyeo) and 'Milyang154' at the Department of Functional Crop Science, NICS, RDA, Korea. The purpose of 'Hanareum2' is to support rice flour in processing industries to fit the demands for farmers and rice processing industries. The heading date of 'Hanareum2' is Aug. 14 as mid maturing ecotype and it also showed multiple resistances to major diseases such as leaf blast, bacterial blight (K1, K2, K3, and K3a) and rice stripe viruses. The milled rice yield of 'Hanareum2 'in local adaptability tests (6 regions) was 7.58 MT/ha. 'Hanareum2' is suitable for southern and middle plain area of Korea. 'Hanareum2' could be used in rice processing industries for cost down of raw materials. [ABSTRACT FROM AUTHOR]

In chronic renal failure, to reduce the burden on the kidneys, it is necessary to provide patients with therapy based on a low-protein diet. This study was conducted to improve eating quality for developing low easy to-digest protein rice variety with Lgc1 gene. Two hundred twenty six recombinant inbred lines (RILs) were used, which were derived from the cross between Chugoku173, a low glutelin rice variety developed in Japan, and Junambyeo, a high quality rice variety in Korea. We investigated glutelin phenotype using SDS PAGE and its genotype by functional DNA marker. As results of them were consistent, this DNA marker is expected to use of MAS for the Lgc1- mediated low glutelin variety. The eating quality of rice measured by Toyo meter (GMT) showed significantly negative correlation with amylose content, but there was no significance with protein content in this population. Dividing the RILs into normal amylose group (app. 19%) and low amylose group (app. 13%), the eating quality estimated by GMT was generally lower in low glutelin lines, but that of low amylose group was higher than that of normal amylose group. On the basis of several results, it is supposed that low amlyose gene can be used to breed the low glutelin rice variety with high eating quality. Through the analysis of agronomic traits related to eating quality, Milyang262, low glutelin and amylose rice variety, were developed. [ABSTRACT FROM AUTHOR]

Bacterial blight (BB) disease is one of the most serious rice diseases in Korea. xa5 showing a wider spectrum resistance to Korean BB isolates is one of the most important bacterial blight resistance genes in rice breeding in Korea. A new rice cultivar 'Shinbaek' carrying xa5 gene was developed at the rice breeding team of the Department of Functional Crop, NICS, RDA in 2010. 'Shinbaek' was derived from the cross between 'Iksan469 and 'HR23966-22-1-2' carrying xa5 gene which was originated from indica rice 'IRBB5'. 'Shinbaek' is resistance to a major Korean BB isolate such as K1, K2, K3 and K3a, and it is also resistance tor ice stripe virus disease (RSV). Heading date of 'Shinbaek' is August 11 as mid maturing ecotype. The major agronomic characteristics of 'Shinbaek' is good plant type with short culm length, longer panicle length, higher number of spikelet per panicle as compared to those of 'Nampyeongbyeo', However, the number of tiller and grain filling ratio were lower compared to that of 'Nampyeongbyeo'. The grain appearance, amylose content, and protein content were similar with those of 'Nampyeongbyeo'. However the palatability of cooked rice and milling recovery were still lower than those of 'Nampyeongbyeo'. The milled rice yield of 'Shinbaek' is 5.75 MT per ha, 5.49 MT per ha and 4.68 MT per ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, 'Shinbaek' would be a suitable cultivar to the mid and southern plain area, especially in BB disease prone area and it is a useful source to enhance the BB resistant breeding program. [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]

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]

Rice ageing describes the changes in physical and chemical properties of rice grains during storage that alter the eating quality of rice. The prevention of deterioration in palatability of rice during storage is important for stable supply. In this study, We conducted to select the variety with superior palatability after storage at room temperature. 'Yeonghojinmi' had much higher head rice ratio of milled rice than that of 'Ilmi', 'Junam'and 'Hwayeong'at similar moisture content of approximately 15%. Grossiness and stickiness were higher in 'Yeonghojinmi' than that of the others. Meanwhile, yellowness(b value) of cooked rice was lower in 'Yeonghojinmi' than that of the others. Of the four varieties, Yeonghojinmi was maintained good eating quality after storage in room temperature, which also contributed to differences in palatability, such as protein content, glossiness, stickiness and color of cooked rice. [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]

Agriculture is being forced into marginally productive areas due to utilization of more land area for housing and industrial activities. Furthermore, climate changes also become a primary restriction factors for food security. To cope against these changes, a Tongil-type rice cultivar 'Saegyejinmi' derived from a cross of 'Milyang160 (Areumbyeo)' and 'Yongjubyeo (Suwon333)' which is high yielding and good eating quality as well as multiple deasease resistant was developed at Department of Functional Crops, NICS, RDA in 2008. The pedigree name of 'Saegyejinmi' is YR20798-6-3-1, which was designated as 'Milyang 223' later. Heading date of 'Saegyejinmi' is August 17 as mid-late ecotype unlike other early ecotype of Tongil-type cultivars. The culm length of 'Saegyejinmi' was 82 cm which is 10 cm higher than that of 'Dasanbyeo'. 'Saegyejinmi' shows multiple resistances to leaf blast, all races of bacterial blight (K1, K2, K3, K3a), and rice stripe viruses. It is susceptible to plant hoppers. The taste and texture of cooked 'Saegyejinmi' were similar or even higher compared to that of japonica grains. In the local adaptability test, the potential milled rice yield of 'Saegyejinmi' was about 7.01 MT/ha at 18 kg/10a of nitrogen fertilizer level. 'Saegyejinmi' is suitable for mid and southern plains of Korea. [ABSTRACT FROM AUTHOR]

Demands on environmentally friendly rice varieties as a primary food source and functional value are gradually increasing in recent rice consumer markets. Thus, multiple disease and insect resistance rice cultivar with good eating quality is essential in safe rice production. To cope with this situation, the rice breeding team of the Department of Functional Crop, NICS, RDA in 2009 released a new rice cultivar 'Cheongnam' which is resistant to rice green leafhopper (GRH). The anther culture method was employed for the developement of 'Cheongnam' which is derived from a cross of 'Kinuhikari' and 'Milyang 189' as a source of GRH resistant. Individual F2 plants of 'Cheongnam' / 'Junam' were classified as resistance or susceptible based on the survival ratio of GRH nymph. A total of 159 F2 plants from 'Cheongnam' / 'Junam' inoculated with GRH segregated into 116 resistant, and 43 susceptible plants, which fit to a 3:1 ratio and (χ2 = 0.38, df = 1, p = 0.54), suggesting the inheritance of a dominant gene for resistance. Heading date of 'Cheongnam' is August 11 as mid maturing ecotype. In the major agronomic characteristics of 'Cheongnam', number of spikelet/panicle was slightly low while 1,000 grain weight of brown rice was heavier as compared those of 'Nampyeongbyeo'. The grain appearance, palatability and other items were more or similar to those of 'Nampyeongbyeo' in panel test of cooked rice. The milled rice yield of 'Cheongnam' is 5.43 MT per ha, 5.00 MT per ha and 5.18 MT per ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, 'Cheongnam' would be a suitable cultivar to the mid and southern plain area, especially in environmentally friendly agricultural production area where rice stripe and dwarf virus as well as bacterial blight are frequent. [ABSTRACT FROM AUTHOR]

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]

Recently, concerns have been voiced about the potentially serious effects on agriculture by the global temperature change and global warming that causes the decreasing yield and grain quality. To cope with this situation, the rice breeding team of Department of Functional Crop, NICS, RDA in 2009 released a new rice cultivar 'Yeonghojinmi' which is resistant to bacterial blight, and rice stripe virus. The anther culture method was employed for the development of this cultivar which is derived from a cross between 'Hitomebore' and 'Junambyeo'. Heading date of 'Yeonghojinmi' is August 21st as mid-late maturing ecotype. In the major agronomic characteristics of 'Yeonghojinmi', number of spikelet/panicle was slightly low while 1,000 grain weight of brown rice was heavy as 22.2 g compared with that of 'Nampyeongbyeo'. The grain appearance was cleared, and palatability and other items were better than those of 'Nampyeongbyeo' in panel test of cooked rice. The milled rice yield of 'Yeonghojinmi' is 5.44 MT/ha, 4.40 MT/ha and 5.04 MT/ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, 'Yeonghojinmi' would be a suitable cultivar to the southern plain area. [ABSTRACT FROM AUTHOR]

Virus diseases often cause serious damage to rice production in Asia. The lack of information on virus resistance genes has been a major obstacle for the breeding of resistant varieties. In order to identify DNA marker associated with resistance against rice stripe virus (RSV), the quantitative trait locus (QTL) was carried out using advanced backcross population developed from a cross between RSV-resistant tongil type cultivar Shinkwang and susceptible japonica cultivar Ilpum. A RSV resistance QTL qSTV11SG explaining 44.2% of the phenotypic variation was identified on chromosome 11 of Tongil type rice cultivar 'Shingwang'. qSTV11SG was tightly linked to DNA marker RM6897. The RM6897 divided as resistance type allele and susceptible type alleles. Twenty seven resistant varieties showed the resistant-type allele and 23 susceptible varieties were susceptible-type allele to the marker of RM6897. This results and the molecular markers presented here may be useful in rice breeding for improving RSV resistance in japonica rice. [ABSTRACT FROM AUTHOR]

The main objective of this study was to develop the multi-resistance lines to insects(brown planthopper; BPH, rice green leafhopper; GRH) and disease(blast; BL, bacterial blight; BB and rice stripe virus disease;RSV) with good grain quality and plant type by combining conventional breeding and marker assisted selection(MAS) and to eliminate the linkage drag effects between Bph1 gene and culm length, we conducted MAS of Bph1 gene in advanced backcross and double cross progenies. 'Nampyeong', 'Junam' and 'Milyang220' were used as the parent in this study. 'Milyang220' was used as the donor of brown planthopper resistance gene Bph1 with tall culm length. Two backcross progenies were developed using two recipients 'Nampyeong' carrying GRH resistance gene Grh3(t) with good grain appearance and 'Junam' harboring bacterial blight resistance gene Xa3 with short culm length. Two BC1 generations were resulted from the backcrossing of the F1 plants with recurrent parents 'Nampyeong' and 'Junam'. The second rounds of backcrossing(BC2) were derived from the cross of selected resistant BC1F1 plants based on heterozygous genotype of RM28493 linked to Bph1 gene. The double crossed population was constructed from the cross of between each heterozygous BC2F1 plants at RM28493 locus of 'Nampyeong"3 / Milyang220' and 'Junam"3 / Milyang220'., The homozygous alleles in Bph1 gene were selected using co-dominant DNA marker RM28493 in double crossed population. Eighty-five lines with multi-resistance to BL, BB, RSV, GRH and BPH were selected by bio-assay and MAS in generation of double crossing. The culm length, head rice ratio and yield of the selected multi resistance lines was ranged from 71 to 88 cm, from 51 to 93%, from 449 to 629 kg/10a. respectively. We can select a promising multi resistance line similar with 'Nampyeong' of major agronomic traits such as culm legnth, head rice ratio and yield. It was designated as Milyang265. Finally this study was developed the multi resistant varieties against to insects and diseases with the good grain quality 'Milyang265' by the advanced backcross and double cross combining MAS and it can be used as genetic resources of multi-resistance to insect and diseases in rice breeding programs. [ABSTRACT FROM AUTHOR]

Recently, peoples are greatly concerned with global temperature change because global warming can be a potential serious effect on agriculture production such as yield reduction and poor grain quality. On the other hand, it can bring some beneficial effects through twice cultivation of rice in temperate region. In order to overcome this situation, we developed extremely early-maturing rice 'Milyang255' which heading date was similar with 'Jinbuolbyeo'. Based on agronomic characteristics of 'Milyang255', it has very short stature as 65 cm of culm length and slightly lower spikelets number per panicle compared with that of 'Jinbuolbyeo'. However, the grain appearance, palatability and other items were better than those of 'Jinbuolbyeo' in panel test of cooked rice. The milled rice yield of 'Milyang255' is 3.94 MT/ha at the early transplanting. Especially, its grain filling rate was higher and faster than Jinbuolbyeo and the head rice ratio in milled rice was also higher. Thus, 'Milyang255' can efficiently reduce the growth duration of rice cultivation and also be useful material for research on twice cultivation of rice in Korea. [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]