title: Identification of QTLs for some agronomic traits in rice using an introgression line from Oryza minuta.
abstract: Wild progenitor species provide potential gene sources for complex traits such as yield and multiple resistances to biotic and abiotic stresses, and thus are expected to contribute to sustainable food supplies. An introgression line 'IR71033-121-15' was derived from a wild species Oryza minuta (2n = 48, BBCC, Acc No. 101141) at IRRI. Introgression analysis using 530 SSR and STS markers revealed that at least 14 chromosomal segments distributed over 12 chromosomes had been introgressed from O. minuta. An F2:3 population from the cross between IR71033 and Junambyeo (a Korean japonica cultivar) consisting of 146 lines was used for quantitative trait loci (QTL) analysis of 16 agronomic traits. A total of 36 single-locus QTLs (S-QTLs) and 45 digenic epistasis (E-QTLs) were identified. In spite of it's inferiority of O. minuta for most of the traits studied, its alleles contributed positively to 57% of the QTLs. The other QTLs originated from either parent, IR71033 or Junambyeo. QTLs for phenotypically correlated traits were mostly detected on introgressed segments. Fourteen QTLs corresponded to QTLs reported earlier, indicating that these QTLs are stable across genetic backgrounds. Twenty-two QTLs controlling yield and its components had not been detected in previous QTL studies. Of these, thirteen consisted of potentially novel alleles from O. minuta. QTLs from O. minuta introgression could be new sources of natural variation for the genetic improvement of rice.
authors.affiliation: Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea.
authors.forename: Md Lutfor
authors.initials: ML
authors.lastname: Rahman
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Chu
authors.forename: Min-Sun
authors.initials: MS
authors.lastname: Choi
authors.forename: Yong Li
authors.initials: YL
authors.lastname: Qiao
authors.forename: Wenzhu
authors.initials: W
authors.lastname: Jiang
authors.forename: Rihua
authors.initials: R
authors.lastname: Piao
authors.forename: Sakina
authors.initials: S
authors.lastname: Khanam
authors.forename: Young-Il
authors.initials: YI
authors.lastname: Cho
authors.forename: Ji-Ung
authors.initials: JU
authors.lastname: Jeung
authors.forename: Kshirod
authors.initials: K
authors.lastname: Jena
authors.forename: Hee-Jong
authors.initials: HJ
authors.lastname: Koh
mesh_terms: D003433:Crosses, Genetic; D004843:Epistasis, Genetic; D008040:Genetic Linkage; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D040641:Quantitative Trait Loci