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利用我国长江中游的半冬性品种和杂种以及加拿大、欧洲的春性品种作为亲本材料进行波里马细胞质雄性不育三系的选育研究，取得了如下进展：１．发现在青海的生态条件下大部分长江中游的半冬性品种可以回交转育出彻底不育的不育系，而来自加拿大、欧洲的春性品种在回交转育不育系的过程中，随着回交代数的增加，大部分品种的回交组合出现微量花粉，表现半不育。２．发现春性不育系与半冬性恢复系组配的组合表现出较强的杂种优势，比对照品种增产明显。３．已获得５个双低不育系（１个春性、４个半冬性）、９个双低恢复系（１个春性、８个半冬性）。４．１个双低杂种（３３１）今年将审定，另外，有４个新的双低杂种在１９９５年的品比中比对照增产２５％以上。根据上述有关研究结果，提出今后青海波里马三系杂种的选育方法：利用双低的半冬性品种回交转育双低不育系，利用加拿大和欧洲的春性双低品种回交转育恢复系，用半冬性不育系与春性恢复系组配成杂种。
Using the semi-winter varieties and hybrids in the middle reaches of the Yangtze River and the spring varieties in Canada and Europe as the parent material, we studied the breeding of the three-line Polymorphic Cytoplasmic Male Sterile (CMS) lines, and made the following progress: 1. It was found that most of the semi-winter varieties in the middle reaches of the Yangtze River under the ecological conditions of Qinghai could be backcrossed to transfect sterile lines of complete sterility. However, the spring varieties from Canada and Europe were backcrossed in the process of male sterile , With the increase of backcross generation, most of the backcrossing combinations of the cultivars showed trace pollen, showing semi-sterility. 2. It was found that the combination of spring sterile line and semi-winter restorer line showed strong heterosis, which increased significantly compared with the control. 3. Five double sterile lines (one spring, four and a half winters) and nine double low restorer lines (one spring and eight and a half winters) have been obtained. 4.1 pairs of low-bred (331) will be validated this year, in addition, there are four new double-low hybrids in 1995 compared to the proportion of more than 25% yield increase. Based on the above research results, the future breeding methods of three-line hybrids in the Polima region of Qinghai Province are put forward. Backcrossing double-low sterile lines with double-low semi-winter varieties and back springing double-spring varieties in Canada and Europe Transplanting and restoring lines, with semi-winter sterile line and spring restore the Department of the system into a hybrid.