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甜菜雄性不育多倍体杂交种“工农303”系以雄性不育系M203A为母本,四倍体品系404为父本,4:1田间测交制种,三倍体率达75％以上.母本经4代连续回交,不育率逐步稳定在90％以上。父本经多代选择表现产质量稳定。两年自治区品种区域试验,平均产量较工农4号提高17.6％,含糖率提高1.6％,产糖量提高31.8％;大面积生产示范(1989年)产量较对照提高45.6％,含糖低0.2％,产糖量提高43.5％,且抗病性较强。
The male sterile line M203A was used as the female parent and the tetraploid line 404 as the male parent. The diploid male sterile line “Gongnong 303” was tested in the 4: 1 field with the diploid rate of 75% After four generations of female parent backcross, the fertility rate gradually stabilized at above 90%. Paternal selection by the performance of multiple generations of stable quality and production. In the two-year regional trial, the average yield was 17.6% higher than that of workers and peasants 4, the sugar content increased by 1.6% and the sugar yield increased by 31.8%. The output of large-scale production demonstration (1989) increased by 45.6% and the sugar content was lower by 0.2% %, Sugar yield increased 43.5%, and strong resistance.