ALK and benign prostatic hyperplasia: The well-known, high-yielding, indica variety, 9311, containing the high-yield genes APO1, Ghd7, Ghd8 and Gn1a, grain shape genes GS3 and qSW5, and eating and cooking quality genes Wx and ALK (Additional file 1: Fig. S2), was used as the recurrent parent to further improve its yield, quality and BPH resistance.