Heterosis in winter × spring wheat crosses

Heterosis in the F₁ hybrids between 13 winter wheats and four diverse testers of spring wheat was determined for grain yield and nine other traits. Two crosses IWWSN-6-110 x HPW42 and IWWSN-6-134 x HS240 showed significant economic heterosis over the standard variety HS277 and over the better parent for grain yield, grains per spike and harvest index, whereas, the cross IWWSN-6-110 x VL616 showed high heterosis over standard check only. The crosses exhibiting significant heterosis over the better parent for grain yield and yield attributing traits were IWWSN-6-110 x HS240, IWWN-6-110 x HD2380, IWWSN-6-134 x HD2380, IWWSN-6-134 x HPW42, BEIJING637 x HS240 and JCAM/EMU“S”IIDOVE “S” SWM 12314-13M-OM-9M-3M-4WM-OWH x HD 2380.