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选育玉米大粒自交系，对提高杂交种粒重有着明显的作用。自交系大粒形成机制是不同的。除了种质遗传的作用外，一种是由灌浆速率高形成的大粒，遗传稳定性较强；另一种是由有效灌浆期延长形成的大粒，遗传稳定性较弱，受环境影响或产。选用高灌浆速率的大粒材料作选系亲本，在大粒选择压下，自交各代均可保持高灌浆速率遗传性，从而育成新的一般配合力更高的大粒自交系，在一定条件下甚至可育成超大粒自交系。
Breeding large grain inbred lines of maize, to improve hybrid seed weight has a significant role. Inbred lines big grain formation mechanism is different. In addition to the role of germplasm inheritance, one is a large grain formed by the high rate of grain filling, genetic stability is strong; the other is formed by the effective grain filling stage extended grain, genetic stability is weak, affected by the environment or production. The selection of high filling rate of large grain materials for the selected line parents, in the large selection of grain pressure, self-generation can maintain a high filling rate heredity, resulting in a new higher general inbreeding with large grain inbred lines, under certain conditions Can even be bred into super-grain inbreds.