Development of plant height from the soil surface to the top ligule (A), the dynamic changes of plant dry weight from sowing to heading (B) and the phenotypic appearance (C) of <i>Rht12</i> dwarf lines and tall lines under GA₃ treatments in the 2012–2013 growing season.

<p>A: development of plant height of the RR, RR-GA, rr and rr-GA plants. The final height was achieved at week 28 for RR plants but at week 27 for rr, rr-GA and RR-GA plants. B: the dynamic changes of plant dry weight in the plants. C₁: RR and RR-GA plants taken from the field at the 20^th week; C₂: RR and RR-GA plants at the 23^th week; C₃: the main stem of RR and RR-GA plants at the 23^th week. The RR-GA plants had produced three internodes while the RR plants only elongated one or two internodes; C₄: RR and RR-GA plants at the 26^th week. RR: <i>Rht12</i> dwarf lines; rr: tall lines; RR-GA: <i>Rht12</i> dwarf lines with GA₃ application; rr-GA: tall lines with GA₃ application.