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玉米自交系作为玉米制种的亲本,其纯度高低是影响玉米制种产量、质量和决定大田玉米产量的主导因素,实践证明用纯度不高的自交系配制的杂交种,比用纯的自交系配制的同一组合减产10%～30%,随着自交系应用时间的延长,如果稍有疏忽防杂保纯,用其配制的杂交种减产程度更大。同时玉米自交系是异花接粉,花粉轻而量大,易产生生物学混杂,因此,切实搞好
Maize inbred lines as the parent of corn seed production, its purity is the impact of maize seed production, quality and the main factor determining the yield of maize field, the practice proved that inbred lines with low purity than the pure Inbred lines prepared by the same combination of reduced 10% to 30%, with the extension of the application time of inbred lines, if slightly inadvertent antipolyphenylaminate, the hybrids prepared with its yield even greater. At the same time, maize inbred lines are allotransplanted, pollen light and large, easy to produce biological hybrid, therefore, do a good job