[QTL analysis of the uppermost internode length in rice under different growing environments]

A mapping population of 98 backcross inbred lines ( BC1F12 and BC1F13 ), derived from a backcross of Nipponbare (japonica) / Kasalath (indica) // Nipponbare by the single seed descent methods, was employed to map quantitative trait loci (QTL) of the uppermost internode length in rice under different growing environments by composite interval mapping method. The results showed that 13 QTLs relating to the uppermost internode length were detected under three differ- ent growing environments, and these QTLs were located on chromosome 1, 2, 3, 5, 6, 8, 10 and 11, explained 3.97 -15.21% of observed phenotypic variance, respectively. The locus of qUIL-6 was detected in three growing environments, and qUIL-1a, qUIL-3a, qUIL-3b and qUIL-10a were detected in two growing environments, indicating that these QTLs were stable and little affected by the environment.