两系法杂交稻只需要不育系和恢复系两系配套就可生产杂交稻种子,不需要三系法杂交稻中的保持系。两系法杂交稻所用的不育系是光敏核不育系,它在长光照下抽穗不育,在短光照下抽穗则可育。两系法有利于提高种子纯度和降低种子生产成本。 湖北省农科院用两系法选育成功的N5088S/R187,属中熟杂文晚粳新组合。该组合全生育期125天左右,比鄂宜105迟熟1～2天。在湖北作双晚种植,6月中下 Two-line method of hybrid rice only needs two lines of CMS and restorer line can produce hybrid rice seeds, do not need three lines of hybrid rice in the maintainer line. The two-line hybrid rice used in CMS is a photo-sensitive genic male sterile line, which is inbred of infertility in long light and heading in the short light. Two lines of law is conducive to improving seed purity and reduce seed production costs. Hubei Academy of Agricultural Sciences with two lines of successful breeding N5088S / R187, is a medium-maturity essay late japonica new combinations. The combination of the whole growth period of about 125 days, 105 than the late Yue Yi 1 to 2 days. In Hubei for double night planting, June in the next