“…There have been various mapping and mechanism studies for haploid induction in maize (Dong et al, ; Li, Xu, Jin, & Chen, ; Liu et al, ; Prigge et al, ; Wu, Li et al, ; Wu, Ren et al, ; Zhao, Xu, Xie, & Jin, ), but only few investigated SHGD. Wu, Li et al () and Wu, Ren et al () reported a particular type of DHs, named “early DHs”, which were directly generated by in vivo haploid induction.…”