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热带亚热带玉米对温带玉米在性状上有较大互补性。种质导入可进一步丰富温带玉米遗传基础，改善某些重要性状．如抗倒伏，持绿性等。热带亚热带种质导入量以１／４～１／８较好，导入过多会使配合力降低，导入过少会使优良性状散失、因此掌握适当的导入量是选系成败的关键。与温带种质材料一样，不同的热带亚热带种质材料优劣程度也存在很大差异，只有选用表现优良的种质，导入优良的温带玉米，才会收到良好的选系效果．
Tropical and subtropical maize have great complementarities to temperate maize in traits. Introduction of germplasm can further enrich the genetic basis of temperate maize and improve some important traits. Such as lodging resistance, holding green and so on. Tropical subtropical germplasm in the amount of 1/4 to 1/8 is better, too much will lead to reduced the ability to join, too little will lead to the introduction of poor traits lost, so to master the appropriate amount of the introduction of the key is the success or failure of the selection system. As with temperate germplasm, the advantages and disadvantages of different tropical and subtropical germplasm are quite different. Only by selecting excellent germplasm and introducing good temperate maize can we get a good selection effect.