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Rice ( Oryza sativa L.) is a staple food for most of the world's population, as it is eaten by nearly half of its inhabitants. Phenylpropanoid glycosides derived from plants have various biomedical effects. The comparison of the concentrations of the four major phenylpropanoid glycosides in brown rice, i.e., 6- O -feruloylsucrose ( 1 ), 3',6-di- O -sinapoylsucrose ( 2 ), 3'- O -sinapoyl-6- O -feruloylsucrose ( 3 ), and 3',6-di- O -feruloylsucrose ( 4 ), between a conventional japonica -type cultivar Koshihikari and a high-yielding indica -type cultivar Takanari revealed that they were 57-162% higher in Koshihikari than in Takanari. To identify quantitative trait loci (QTLs) for the concentrations of these compounds ( 1 - 4 ), reciprocal chromosome segment substitution lines derived from a cross between Koshihikari and Takanari were analyzed. We identified QTLs for the concentrations of compound 1 on chromosome 2 and of compound 2 on chromosome 4 in the reciprocal genetic background. The concentrations of these compounds were increased by the Koshihikari alleles and decreased by the Takanari alleles. Therefore, the favorable alleles of Koshihikari are available to ameliorate the lower concentrations of compounds 1 and 2 in Takanari. The combinations of QTLs identified in the present study together with those of other biologically active compounds make it possible to breed health beneficial cultivars.

Identification of Quantitative Trait Loci for the Concentrations of Phenylpropanoid Glycosides in Brown Rice