提纯复壮是防止杂交水稻“三系”亲本混杂退化、确保杂种优势及优良种性的根本措施。多年来,全国许多单位都曾开展了这方面的研究工作,并形成了“成对交四圃制”、“三系七圃法”、“一选三圃法”等相应配套技术。这些方法对提高杂交稻纯度虽有不同程度的作用,但均存在成本高、花工多、提纯周期长等缺陷。而且,据周天理等研究报道:采用常规提纯方法生产的不育系原种群体,经鉴定仍有较多 Purification and rejuvenation is the fundamental measure to prevent hybrid degeneration of “three lines” parents of hybrid rice and to ensure its heterosis and superiority. Over the years, many units across the country have carried out research work in this area and formed the corresponding supporting technologies such as the “paired-up four-nursery”, the “three-series seven nursery” and the “one-choice three nursery”. Although these methods have different degrees of effect on improving the purity of hybrid rice, they all have the disadvantages of high cost, large number of flower processes, long purification period and the like. Moreover, according to Zhou Tianli and other research reports: the use of conventional purification methods of sterile line of original population, there are still more identified