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Bacterial Blight Resistance Genes Pyramided in Mid-Late Maturing Rice Cultivar ‘Sinjinbaek’ with High Grain Quality
벼흰잎마름병 저항성 유전자 집적 고품질 중만생 벼 ‘신진백’
Korean J Breed Sci 2019;51(3):263-276
Published online September 1, 2019
© 2019 Korean Society of Breeding Science.

Hyun-Su Park1*, Ki-Young Kim2, Man-Kee Baek1, Young-Chan Cho1, Bo-Kyeong Kim1, Jeong-Kwon Nam1, Woon-Chul Shin1, Woo-Jae Kim1, Jong-Cheol Ko1, Jeong-Ju Kim1, Jong-Min Jeong1, Ji-Ung Jeung1, Keon-Mi Lee1, Seul-Gi Park1, Chang-Min Lee1, Choon-Song Kim1, Jung-Pil Suh1, and Jeom-Ho Lee1
박현수1* · 김기영2 · 백만기1 · 조영찬1 · 김보경1 · 남정권1 · 신운철1 · 김우재1 · 고종철1 · 김정주1 · 정종민1 · 정지웅1 · 이건미1 · 박슬기1 · 이창민1 · 김춘송1 · 서정필1 · 이점호1

1National Institute of Crop Science, RDA, Wanju 55365, Republic of Korea
2Research Policy Bureau, RDA, Jeonju 54875, Republic of Korea
1농촌진흥청 국립식량과학원, 2농촌진흥청
Correspondence to: (E-mail: mayoe@korea.kr, Tel: +82-63-238-5214, Fax: +82-63-238-5205)
Received July 22, 2019; Revised August 6, 2019; Accepted August 16, 2019.
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
‘Sinjinbaek’ is a bacterial blight (BB)-resistant, mid-late maturing rice cultivar with high grain quality. To diversify the resistance genes and enhance the resistance of Korean rice cultivars against BB, ‘Sinjinbaek’ was developed from a cross between ‘Iksan493’ (cultivar name ‘Jinbaek’) and the F1 cross between ‘Hopum’ and ‘HR24670-9-2-1’ (‘HR24670’). ‘Jinbaek’ is a BB-resistant cultivar with two BB resistance genes, Xa3 and xa5. ‘Hopum’ is a high grain quality cultivar with the Xa3 resistance gene. ‘HR24670’ is a near-isogenic line that carries the Xa21 gene, a resistance gene inherited from a wild rice species O. longistaminata, in the genetic background of japonica elite rice line ‘Suweon345’. ‘Sinjinbaek’ was selected through the pedigree method, yield trials, and local adaptability tests. Using bioassay for BB races and DNA markers for resistance genes, three resistance genes, Xa3, xa5, and Xa21, were pyramided in the ‘Sinjinbaek’ cultivar. ‘Sinjinbaek’ exhibited high-level and broad-spectrum resistance against BB, including the K3a race, the most virulent race in Korea. ‘Sinjinbaek’ is a mid-late maturing rice cultivar tolerant to lodging. It has multiple disease resistance against BB, rice blast, and stripe virus. The yield of ‘Sinjinbaek’ was similar to that of ‘Nampyeong’. ‘Sinjinbaek’ showed excellent grain appearance, good taste of cooked rice, and enhanced milling performance, and we concluded that it could contribute to improving the quality of BB-resistant cultivars. ‘Sinjinbaek’ was successfully introgressed with the Xa21 gene without the linkage drag negatively affecting its agronomic characteristics. ‘Sinjinbaek’ improved the resistance of Korean rice cultivars against BB by introgression of a new resistance gene, Xa21, as well as by pyramiding three resistance genes, Xa3, xa5, and Xa21. ‘Sinjinbaek’ would be suitable for the cultivation in BB-prone areas since it has been used in breeding programs for enhancing plants’ resistance to BB (Registration No. 7273).
Keywords : Sinjinbaek, Rice, Bacterial blight, Resistance gene, Xa21, Pyramiding


September 2019, 51 (3)
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