Registration of a Rice Gene-Mapping Population Consisting of 'TeQing'-into-'Lemont' Backcross Introgression Lines

A new rice (Oryza sativa L.) mapping population consisting of 123 'TeQing'-into-'Lemont' backcross introgression lines (TILs) (Reg. No. MP-5, NSL 477436 MAP) was developed by the USDA-ARS Rice Research Unit at the Texas A&M University System AgriLife Research and Extension Center at Beaumont, TX, in cooperation with the Texas AgriLife Research and Extension Center, the USDA-ARS Dale Bumpers National Rice Research Center, the Arkansas Agricultural Experiment Station, and the International Rice Research Institute. One of the most studied and phenotypically characterized rice mapping populations available today is a set of 280 Lemont × TeQing recombinant inbred lines, which has been used by various groups to molecularly map more than 250 agronomically important loci. The current set of 123 TILs containing molecularly tagged portions of the indica TeQing genome now introgressed into the genetic background of Lemont, a U.S. tropical japonica rice cultivar, was developed to support efforts to fi ne map and further evaluate the previously mapped TeQing loci for their breeding value within a tropical japonica rice breeding program. The utility of the TILs was documented by verifying previously reported qualitative trait loci (QTLs) for Lemont and TeQing heading time. As a set of molecularly characterized chromosome-segment substitution lines, the TILs are useful for QTL verifi cation, de novo mapping, and evaluation of the agronomic value of indica loci to a tropical japonica rice breeding program.