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Distribution of identified quantitative trait loci (QTL) for grain size and grain weight on genetic linkage maps in F2 populations. The marks denote peak positions of QTL; 15JN, 18HN, and 19HUN represent Jining in 2015, Hainan in 2018 and Hunan in 2019, respectively. Numbers on the left side are the genetic distances between two flanking markers with the unit centiMorgan (cM).
