D64B were crossed with inhomogeneous sterile lines , preserver lines and restorer lines , most of their F1 shared the same heading dates as D64B .

• 用不育系、保持系、恢复系以及早稳型水稻品种与之杂交，F1的抽穗期多数与早熟亲本D64B相同或相近，部分偏向早熟亲本。