Identification of QTLs for Grain Quality on a RIL Population Derived from a Cross between Japonica Rices

Abstract

A recombinant inbred lines (RILs) consisting of 231 lines, derived from a japonica (Suweon365) and a japonica (Chu-cheongbyeo) rice, was used to investigate the genetic factors affecting cooking and eating quality of rice. Alkali digestion valueloci (QTLs) analysis over 2 years. A total of 10 QTLs for the four traits were detected, of which two for ADV, two for AMY, twofor PRO and four for GCR. QTL-by-environment interactions were observed by comparing QTL mapping of the same populationgrown in 2 years. For each trait, one to two QTL were found, which were repeatedly detected in 2 years at five loci on chro-mosomes 1, 6, 7 and 8. Two QTLs for GCR on chromosomes 7 and 8 were closely linked with QTLs for PRO. To confirm themarker assisted selection (MAS). In BC3F2 generation, the lines homozygous for Chucheongbyeo allele had the allele effect of2.35 for qGCR-7, 2.25 for qGCR-8, and 1.25 for qGCR-1. These results would be useful in MAS breding for the improvementof rice eating quality and pyramiding of desirable QTLs.