Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12915-015-0187-4/MediaObjects/12915_2015_187_Fig4_HTML.gif)
Comparison of QTL mapping results for days to tasseling (DT) among the US-NAM, CN-NAM, and CN-US NAM populations. a QTL mapping results for DT. The physical distance for each chromosome is represented in Mb (Mega-base) units on the horizontal axis. Bar width represents QTL confidence interval. Arrows represent the physical positions of the known maize flowering-time genes overlapping with QTL. b Venn diagram showing numbers of unique and shared QTLs among US-NAM, CN-NAM, and CN-US NAM