Fig. 2
From: Detection of Novel QTLs Regulating Grain Size in Extra-Large Grain Rice (Oryza sativa L.) Lines
Frequency distribution of grain length and width and quantitative trait loci (QTLs) detected in F2 populations. Frequency distribution of grain length is shown in a, c, e, and g. Frequency distribution of grain width is shown in b, d, f, and h. F2 populations derived from Kasalath × BG23 (a and b), Kasalath × LG10 (c and d), Nipponbare × BG23 (e and f), and Nipponbare × LG10 (g and h) crosses. Vertical white and black arrowheads indicate the means of the middle-size grain cultivars and extra-large grain lines, respectively. Genetic linkage maps of F2 populations derived from Kasalath × BG23 (i), Kasalath × LG10 (j), Nipponbare × BG23 (k), and Nipponbare × LG10 (l). Boxes indicate positions of regions harboring QTLs with the logarithm of the odds > 3.0 for grain length (black) and width (white). Horizontal black arrowheads indicate the position of previously cloned QTLs for grain size. Double-headed arrows indicate the position of previously detected QTLs for grain size. Bars indicate marker positions