‘Geumgang 1’ (Milyang307) is a high-yielding Tongil-type rice cultivar developed by the National Institute of Crop Science, RDA, in 2017 for the rice processing and baking industries. It was derived from a cross between ‘Dasan1’ and ‘Geumgangbyeo’. The cultivar heading date is on August 14 in the southern plain region of Korea and is classified as medium-late maturing. It has a culm length of 74 cm, 13 panicles per hill, 142 spikelets per panicle, a ripened grain ratio of 78.6%, and a 1,000-grain weight of 23.1 g. ‘Geumgang 1’ is resistant to leaf blast, bacterial blight (K1-K3a), and rice stripe virus but susceptible to brown planthopper. In regional adaptability tests (2015-2017) at three locations, it produced an average milled rice yield of 8.17 MT/ha, the highest recorded among Korean rice cultivars and was 23% higher than the yield of ‘Dasan’. With 19.0% amylose and flour properties similar to those of japonica rice, it is well suited as a wheat flour substitute for bakery products and is recommended for single-cropping plains in southern Korea (Registration No. 7686).
‘Amimyeon’ (Milyang355) is a new Tongil-type rice cultivar developed by NICS, RDA, in 2022, to improve processing suitability and cost competitiveness in the rice noodle industry. Derived from a cross between ‘Milyang288’ and ‘Bukkyeong2012-2,’ it is medium-late maturing ecotype with an average heading date of August 13. It has a culm length of 81 cm, 122 spikelets per panicle, a ripening ratio of 85.2%, and distinct medium-long grains (length-to-width ratio of 2.77). ‘Amimyeon’ exhibits strong resistance to leaf blast and rice stripe virus, with a very low viviparous germination rate (0.2%). Physicochemical analyses revealed high amylose content (26.7%), 8.1% protein content, and a Jasmine85-like aromatic profile. Cooked pasta and noodles made from ‘Amimyeon’ exhibited superior springiness, cohesiveness, and tensile strength compared with commercial products. Its average milled rice yield was 7.24 MT/ha (724 kg/10a), revealing a 4% increase over ‘Dasan’. Thus, ‘Amimyeon’ is highly recommended for plain regions in South Korea as a premium processing material (Registration No. 10644).
Bakanae disease, caused by various Fusarium species, poses a significant threat to global rice production, with its incidence increasing in major rice-producing regions. Currently, no rice varieties exhibit complete resistance to this disease. Enhancing resistance in rice cultivars could serve as a cost-effective and sustainable alternative to fungicide application. Developing resistant rice varieties may offer a practical solution to mitigate yield losses and reduce dependency on chemical treatments. ‘Jinokchal’ was derived from the cross between ‘Milyang299’, which harbors bakanae disease-resistant QTL qBK1. and ‘Baekokchal’ in 2014. A promising line, YR31624-5B-2, was then selected and designated as ‘Milyang366’ in 2019. The local adaptability test of ‘Milyang366’ was conducted at five locations from 2020 to 2022, and the cultivar was subsequently named ‘Jinokchal. ’ The heading date of ‘Jinokchal’ was August 13, classifying it as a medium-late maturing cultivar. The culm was 77 cm long and had 108 spikelets per panicle. The 1,000 grain-weight of brown rice is 22.7 g, which is heavier than that of ‘Sinseonchalbyeo’. This variety is resistant to blast, rice stripe virus, and bacterial blight, but susceptible to insect pests. The yield potential of ‘Jinokchal’ was approximately 497 kg/10a at the ordinary fertilizer level in the local adaptability test over three years. ‘Jinokchal’ is moderately resistant to bakanae disease and harbors the qBK1 gene derived from the tong-il type rice ‘Shingwang’ (Registration No. 8135).
Bakanae disease is caused by several species of Fusarium and imposes serious limitations to rice production worldwide. The incidence of this disease is increasing in the top rice-growing countries. No rice variety has been found to be completely resistant to this disease. Thus, higher resistance to the disease may be a cost saving solution preferable to the application of fungicides. ‘Anpyeong’ was derived from the cross between ‘YR24982-9-1’ and ‘Saeilmi’ in 2012 and selected as the promising line, ‘YR30389-B-2GH-103’; it was further selected and designated as ‘Milyang 313’ in 2016. The local adaptability test for ‘Milyang 313’ was conducted at five locations from 2016 to 2018 and the cultivar was named ‘Anpyeong’. The heading date for the medium-late maturing cultivar ‘Anpyeong’ was August 13. The ‘Anpyeong’ culm was 77 cm long and had 115 spikelets per panicle. The brown rice 1,000 grain-weight was 22.2 g, which is higher than that of ‘Nampyeong’. This variety is resistant to blast disease and rice stripe virus, but susceptible to bacterial blight and insect pest. The potential ‘Anpyeong’ yield was approximately 562 kg/10 a at ordinary fertilizer level in the local adaptability test and for three years. ‘Anpyeong’ harboring the qBK1 gene derived from a tongil type rice ‘Shingwang’ is moderately resistant to bakanae disease (Registration No. 8135).
Rice stripe virus (RSV) is one of the major constraints in rice production which is transmitted by the small brown plant hopper, Laodelphax striatellus. Identifying new resistance genes from diverse sources is important for rice breeding programs to enhance the resistance level and/or to overcome the breakdown of resistance genes. This study was conducted to identify novel sources of resistance against RSV. We used five RSV resistant varieties that do not harbor Stv-bi. The presence of known genes for RSV resistance was identified using the InDel7 marker for Stv-bi, two Indel (Sid primer set) markers for Stv-b, and DNA sequence analysis for OsSOT1. We revealed that two varieties, 02428 (IT236925) and Tung Ting Wan Hien 1, are novel RSV resistance sources.
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