Fig. 4

Pyramiding effect analysis of qSl-2B in different genetic backgrounds under LN and HN environments. (a) In the figure on the left, the Arabic numerals above each bar indicate the serial ID of the lines ranked according to SL value, from high to low SL. The Arabic numerals below each bar indicate number of positive alleles that increase SL. Arabic numerals at the bottom of each bar chart indicate the number of lines in each group. The figure on the right shows the origins of the positive and negative alleles for the three QTLs and the meaning of the code symbols. (b-e) The additive effects of qSl-2B in different genetic backgrounds under both HN and LN conditions. And the table at the bottom of in each bar chart shows the number of lines and the average SL (± SD) for each group. *, Significant difference at P < 0.05; **, highly significant difference at P < 0.01