杂种优势是生物的重要现象,我国杂交水稻培育成功是水稻育种的重大突破.我省一九七八年种植杂交水稻835万亩,增产量占全省粮食总增产量的一半左右.但由于杂交水稻制种比较繁杂,群众盼望培育出既能坚持优势又不需要制种的新品种.我们自一九七四年开始进行杂交水稻辐射诱变的探索,育成了产量优势相当于原组合的优辐系统,并在生产上示范推广. Heterosis is an important biological phenomenon, and the successful breeding of hybrid rice in China is a major breakthrough in rice breeding.Our province planted 835 million mu of hybrid rice in 1978, accounting for about half of the total grain output in the province, but due to hybridization Rice seed production is complicated and the masses are looking forward to cultivating new varieties which can not only insist on advantages but also lack seed production. Since 1974, we have explored the radiation mutagenesis of hybrid rice and have bred the advantages of yield equivalent to the original combination Spread the system, and in the production demonstration promotion.