Mapping QTLs with Epistasis for Mesocotyl Length in a DH Population from indica-japonica Cross of Rice(Oryza sativa)

A double haploid (DH) population derived from across between an indica female parent IR64 and a japonica male parent Azucena, was used for detecting QTLs with additive effects and their epistasis for rice mesocotyl length under low temperature and moderate temperature germination condition. Four QTLs with additive effects on chromosome 1, 3, 7 and 8, two pairs of QTLs with epistasis effects on chromosome 3, 7 and 12 controlled mesocotyl length with variance explained being 21.62% and 2.27%.Two pairs of additive×environment and epistasis×environment interaction effects of QTLs were also detected,respectively. Molecular marker assistant selecting mesocotyl length of rice was discussed.