title: Identification of quantitative trait loci associated with rice eating quality traits using a population of recombinant inbred lines derived from a cross between two temperate japonica cultivars.
abstract: Improved eating quality is a major breeding target in japonica rice due to market demand. In this study, we performed genetic analysis to identify quantitative trait loci (QTLs) that control rice eating quality traits using 192 recombinant inbred lines (RILs) derived from a cross between two japonica cultivars, 'Suweon365' and 'Chucheongbyeo'. We evaluated the stickiness (ST) and overall evaluation (OE) of cooked rice using a sensory test, the glossiness of cooked rice (GCR) using a Toyo-taste meter, and measured the amylose content (AC), protein content (PC), alkali digestion value (ADV), and days to heading (DH) of the RILs in the years 2006 and 2007. Our analysis revealed 21 QTLs on chromosomes 1, 4, 6, 7, 8, and 11. QTLs on chromosomes 6, 7, and 8 were detected for three traits related to eating quality in both years. QTLs for ST and OE were identified by a sensory test in the same region of the QTLs for AC, PC, ADV, GCR and DH on chromosome 8. QTL effects on the GCR were verified using QTL-NILs (near-isogenic lines) of BC(3)F(4-6) in the Suweon365 background, a low eating quality variety, and some BC(1)F(3) lines. Chucheongbyeo alleles at QTLs on chromosomes 7 and 8 increased the GCR in the NILs and backcrossed lines. The QTLs identified by our analysis will be applicable to future marker-assisted selection (MAS) strategies for improving the eating quality of japonica rice.
authors.affiliation: Rural Development Administration, National Institute of Crop Science, Suwon 441-857, Korea.
authors.forename: Soon-Wook
authors.initials: SW
authors.lastname: Kwon
authors.forename: Young-Chan
authors.initials: YC
authors.lastname: Cho
authors.forename: Jeong-Heui
authors.initials: JH
authors.lastname: Lee
authors.forename: Jung-Pil
authors.initials: JP
authors.lastname: Suh
authors.forename: Jeong-Ju
authors.initials: JJ
authors.lastname: Kim
authors.forename: Myeong-Ki
authors.initials: MK
authors.lastname: Kim
authors.forename: Im-Soo
authors.initials: IS
authors.lastname: Choi
authors.forename: Hung-Goo
authors.initials: HG
authors.lastname: Hwang
authors.forename: Hee-Jong
authors.initials: HJ
authors.lastname: Koh
authors.forename: Yeon-Gyu
authors.initials: YG
authors.lastname: Kim
mesh_terms: D032461:Chromosomes, Plant; D018745:Genome, Plant; D006801:Humans; D012275:Oryza / Q000235:genetics*; D040641:Quantitative Trait Loci; D011995:Recombination, Genetic