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玉米单交种的扩大种植,使获得高产的亲本自交系得到极大重视。因此,选育自身表现良好并且具有优良杂交表现的自交系便成为当前玉米育种计划的首要目标。这样的自交系可以由经过改良的群体中选育。选择高产自交系之前进行轮回选择是有效的,但这种优良自交系并不能经常得到(Zuber,1982)。另一个问题是自交系广泛利用的周期很短(Zuber 等,1980),大多数成功的自交系利用高峰期约为
The expanded planting of maize crosses has given great importance to obtaining high-yielding parental inbred lines. Therefore, breeding inbred lines that perform well and have excellent hybridization performance has become the primary goal of current maize breeding programs. Such inbred lines can be bred from a modified population. It is effective to select for cycles before selecting high-yielding inbred lines, but this elite inbred line is not always available (Zuber, 1982). Another problem is that the inbred lines have a very short cycle of utilization (Zuber et al., 1980). Most of the successful inbred lines use peak periods of about