Journal of Crop Science and Biotechnology
- Volume 11 Issue 4
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- Pages.269-276
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- 2008
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- 1975-9479(pISSN)
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- 2005-8276(eISSN)
QTLs Identification and Confiirmation of Field Resistance to Leaf Blast in Temperate japonica Rice (Oryza sativa L.)
- Cho, Young-Chan (National Institute of Crop Science, RDA) ;
- Kwon, Soon-Wook (National Institute of Crop Science, RDA) ;
- Suh, Jung-Pil (National Institute of Crop Science, RDA) ;
- Kim, Jeong-Ju (National Institute of Crop Science, RDA) ;
- Lee, Jeom-Ho (National Institute of Crop Science, RDA) ;
- Roh, Jae-Hwan (National Institute of Crop Science, RDA) ;
- Oh, Myung-Kyu (National Institute of Crop Science, RDA) ;
- Kim, Myeong-Ki (National Institute of Crop Science, RDA) ;
- Ahn, Sang-Nag (Department of Agronomy, Chungnam National University) ;
- Koh, Hee-Jong (School of Plant Science, Seoul National University) ;
- Yang, Sae-Jun (National Institute of Crop Science, RDA) ;
- Kim, Yeon-Gyu (National Institute of Crop Science, RDA)
- Published : 2008.12.31
Abstract
Field resistance is defined as the resistance that allows effective control of a parasite under natural field condition and is durable when exposed to new races of that parasite. To identify the genes for field resistance to rice blast, quantitative trait loci (QTLs) conferring the resistance for races and blast nursery screening in japonica rice cultivars were detected and mapped using SSR markers. QTL analysis was carried out in 190 RILs population from the cross between Suweon365 (moderately resistant) and Chucheong (highly susceptible). Twelve QTLs against nine blast races inoculated were detected on chromosomes 1, 2, 4, 6, 7, 11 and 12. They explained from 5.1% to 34.9% of total phenotypic variation. Eight QTLs against blast nursery screening in four regions for three years were detected on chromosomes 1, 2, 4, 11 and 12. The phenotypic variation explained by each QTL ranged from 4.3% to 37.7%. Three chromosome segment substitution lines (CSSLs) of