Genetic basis of flowering time variation in the BTx642/Tx7000 RIL population. (A). Flowering time phenotypes of BTx642 and Tx7000 in LD. (Days to flowering for BTx642 and Tx7000 are 103 and 84.) Flowering time QTL identified when RIL population were grown in a LD greenhouse (B), under field conditions in 2008 (C) and in a SD greenhouse (D). Permutation tests were carried out to identify 95% confidence thresholds and significant threshold of LOD score is presented as a horizontal red line. Candidate genes associated with main affect QTL are noted above peaks.