A high germination rate at a relatively low temperature is essential for direct seeding rice varieties. The objectives of this study were to detect quantitative trait loci (QTLs) associated with low temperature germinability (LTG) and analyze their epistasis effects. A total of 81 recombinant inbred lines (RILs), derived from a cross between varieties Kinmaze (japonica) and DV85 (indica), was used for QTL mapping in 3 environments, i.e., Nanjing, Jiangsu Province in 2002 and 2003, and Lingshui, Hainan Province in 2002. The germination rate at 15°C, after a 10-day germination culture, was taken as an LTG indicator. A total of 11 QTLs on chromosomes 2, 5, 7, 8, 11, and 12 were detected in the 3 environments by QTL Mapping 2.0 software including the 2 QTLs mapped in similar genomic regions in all the enviroments. The 2 QTLs were located on chromosomes 7 and 11 and origniated from Kinmaze and DV85 each. The maximum percentages of phenotypic variation explained (PVE) of the 2 QTLs were both 27.9%. Epistatic interaction analysis showed slightly low PVE of the 2 QTLs.
All Science Journal Classification (ASJC) codes
- Agronomy and Crop Science
- Plant Science