杂交水稻育种成功,并大面积迅速应用于生产,对于粮食产量的提高,起到了重要的作用.为了减少三系繁殖和制种的麻烦,特别是化杀制种的困难,近年来有关单位,开展了杂种优势的多代利用和固定杂种优势利用的研究,以便降低成本,加速扩大杂交水稻的生产.多数研究者认为,杂种之所以有优势,是由显性,超显性和基因相互作用(上位)所 Hybrid rice breeding success, and rapid application of large areas of production, for the improvement of grain yield, played an important role.In order to reduce the three-line breeding and seed production problems, especially the killing of species difficult in recent years, the relevant units, Carry out multi-generational use of heterosis and the use of fixed heterosis in order to reduce costs and accelerate the expansion of hybrid rice production.Most researchers believe that the reason why hybrids have advantages, by the dominant, super-dominant and genetic interactions (Host) by