基于DH系表现水平的轮回选择已被证明是改良玉米单倍体加倍能力的有效手段。本研究通过试验证明，在单倍体DH⁰世代，基于优选单株组群开始轮回选择，同样也迅速提高了单倍体自然加倍能力。相比较基于DH系水平的轮回选择，每轮节约了1个世代，大幅度提升了选择效率。应用此方法构建了2个Reid群高加倍种质（群体及DH系），自然加倍率分别高达80%以上，已作为骨干核心种质应用于商业育种。“高自然加倍材料快捷创制方法”的成功突破，实现了高加倍种质与优异DH自交系同步创制。“瑞德类群高加倍核心种质的成功创制”，为构建快捷高效的“单倍体自然加倍双轮回育种技术体系”奠定了坚实基础。

Recurrent selection at the DH line level has been shown to be an effective method for improving in maize. This experiment indicated that recurrent selection in haploid level can get the same effect for improving the spontaneous doubling rate, and reducing 1 generation comparing with the DH level selection. Compared to round selection based on the DH¹ series level, it saves 1 generation per round, substantially improving selection efficiency. The population is now used as core germplasm for commercial breeding. The successful breakthrough in the “rapid creation method of high natural doubling material” realized the simultaneous creation of high doubling core germplasm and excellent DH self-cross lines, and the “successful creation of high doubling core germplasm of the Ryder taxon” laid a solid foundation for the construction of a rapid and efficient haploid natural doubling double-round breeding technology system.

吉林省农业科技创新工程重大专项“玉米超快捷高效双轮回育种方法创新及新品种选育（CXGC2021ZD005）”