Seedling vigour characteristics of F2∶3 and F3∶4 lines with Rht12 dwarf and tall genotypes, with and without GA3 treatment.

*RR: dwarf lines with the dominant Rht12; RR-GA: dwarf lines with exogenous GA3 application; rr: tall lines; rr-GA: tall lines with exogenous GA3 application. All data are means ±SD of each group. There was no significant difference in these traits between BB and bb genotypes. Different letters within columns indicate statistically significant differences (P0.05).