title: QTL mapping and introgression of yield-related traits from Oryza glumaepatula to cultivated rice ( Oryza sativa) using microsatellite markers.
abstract: Rice ( Oryza sativa) cultivar development currently faces the task of overcoming yield plateaus, which is difficult due to the narrow genetic base of breeding programs. Oryza glumaepatula is a diploid wild relative of cultivated rice, native to Central and South America, and is therefore a potential source of alleles of agronomic importance to rice breeding programs. We studied 11 agronomic traits in BC(2)F(2) families of the interspecific cross Oryza sativa x O. glumaepatula. Transgressive lines which are almost isogenic to the elite recurrent O. sativa parent were identified for most of these traits. Quantitative trait locus (QTL) analysis was performed by single-point and interval mapping using a molecular map based on 157 microsatellite and STS markers. Marker regions accounting for 14.5 to 72.9% of a phenotypic variation trait were identified in 9 of the 12 rice chromosomes. Positive QTL effects from O. glumaepatula were observed in chromosomal regions associated with tillering and panicle-number traits.
authors.affiliation: Embrapa Arroz e Feijão, C.P. 179, 74001-970, Goiânia - GO, Brazil.
authors.forename: C.
authors.initials: C
authors.lastname: Brondani
authors.forename: N.
authors.initials: N
authors.lastname: Rangel
authors.forename: V.
authors.initials: V
authors.lastname: Brondani
authors.forename: E.
authors.initials: E
authors.lastname: Ferreira