为了筛选早熟高产的杂交早稻,实现早、晚杂交稻配套,从1974年起,我所开始对杂交早稻进行研究。由于不育系一般为早籼品种,要突破杂交早稻组合,关键是选育抗性好、优势强的早熟恢复系。我们用IR系统为亲本的育种后代和早熟中稻作测交亲本,进行了较广泛的成对测交。1975年经过恢 In order to screen early-maturity and high-yielding early-maturing hybrid rice and realize early-late hybrid rice matching, from 1974, I started to study on early hybrid rice. As the male sterile lines are generally early indica varieties, to break through the hybrid early rice combinations, the key is to breed resistant, strong preponderant restorer lines. We used the IR system as the parent breeding progeny and early maturing rice test cross parents, conducted a more extensive pair of test results. After the recovery in 1975