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利用我国自育的优良多胚Ｏ型系作轮回父本，同时与单胚雄性不育系及Ｏ型系进行回交，以达到使单胚二系同步完成细胞核置换，经济性状同步得到改良的目的。通过１９９０～１９９６年两批的杂交试验表明，利用甜菜多胚Ｏ型系作轮回父本对单胚二系授粉，其后代的单胚雄性不育系仍然表现不育性，单胚Ｏ型系仍具有保持不育性遗传的特性。被改良的１５个单胚二系组合其Ｆ１代采种株均出现多胚性状，自交采种后在Ｆ２代采种株群中均出现了单胚性状的分离。该育种方法克服了以往首先改良Ｏ型系，而后再改良不育系的缺点，明显缩短育种年限。试验表明，经过回交改良后的单胚二系含糖率及抗褐斑病、耐根腐病性显著提高。
Using the self-bred excellent polyembryony O-line in our country as the reincarnating parent, we also backcrossed it with the single embryonic male sterile line and the O-line to achieve the synchronization of single cell embryos, complete synchronization of nuclei replacement and improved economic traits simultaneously purpose. Through the hybridization experiments of two batches from 1990 to 1996, it showed that the single embryo male sterile lines of their offsprings still showed infertility by single-embryo two-line pollination by utilizing the multi-embryo O-line of sugar beet as the reincarnating father. Still have the trait of maintaining sterility. The modified 15 single embryos in the second generation hybrids of their F1 generation appeared polyembryon traits, selfing after seed selection in the F2 generation of strains appear single embryo trait separation. The breeding method overcomes the shortcomings of improving the O-type system and then improving the sterile system in the past, and obviously shortens the breeding period. Tests showed that after the backcross improved single embryo two lines of sugar content and resistance to brown spot disease, root rot resistance significantly increased.