杂交水稻能不能定型?它的定型新品系、新品种能不能接近与超过杂种一代的产量水平?对于这个问题,实践作出了肯定的回答。根据达尔文进化论中“延续变异”原理和基因重组遗传理论,通过定向选择和定向培育,我们进行汕优二号杂种后代分离选择,1979年4月在海南种植杂种第五代,获得4个定型品系;1979年秋在上饶种植杂种第六代,获得14个定型品系。经过多点示范 Hybrid rice can not be stereotyped? It stereotypes of new lines, new varieties can be close to and exceed the hybrid generation yield level? For this issue, the practice made a positive answer. According to the principle of “continuation mutation” and genetic recombination in Darwin’s theory of evolution, we select the offspring of hybrids Shanyou 2 by means of directional selection and directional breeding. In April 1979, the fifth generation of hybrids was planted in Hainan, ; The autumn of 1979 planted hybrid Shangrao sixth generation, obtained 14 stereotypes. After more demonstration