Fig. 2. Graphical genotypes of the most tolerant and susceptible BC4F2 progenies in the SubQTL region on the short arm of rice chromosome 9. Distances are in kilobases (kb). Trait descriptions were specified in Materials and Methods. ‘nd’ refers to no data. The picture at the top shows the appearance of a promising submergence‐tolerant BC line (no. 873) after 10 d submergence.