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通过定向轮回选择对玉米自交系进行抗粗缩病特性改良，不仅能提高玉米自交系的抗病性，也随之提高了其组成杂交种的抗性水平。玉米抗粗缩病的性状为数量性状，由微效多基因所控制。一般自交系的抗病基因都不太纯合，这是抗病改良的基础。对自交系进行定向轮选的过程，是微效抗病基因向个体集中和量值增加的过程。
The improvement of anti-sickening characteristics of maize inbred lines through directional reincarnation not only enhanced the disease resistance of maize inbred lines, but also enhanced the resistance level of the hybrids. Maize resistance to disease characteristics of quantitative traits, controlled by the micro-multi-gene. Generally inbred lines of the disease resistance genes are not very homozygous, which is the basis for disease resistance. The process of directed selection of inbred lines is a process of concentration and increase of the amount of the microsatellite resistance genes to individuals.