杂交种亲本改良是提高杂种优势应用水平的必经之路,杂交玉米发展的初期从品种间杂交改变为自交系间杂交,大幅度提高了杂交种的产量,而自交系的继续改良得益于亲本配合力和杂种优势群理论的运用和推动,使杂交玉米的产量在几十年里持续提高,至今仍然保持良好的发展势头。在作物杂种优势利用的数量遗传学原理中,配合力理论起着承上启下的作用,它是杂交玉米育种工作数十年的经验总结,又是后来杂种优势群理论的基础,配合力理论的建立和发展使杂交亲本的选育和 Improvement of hybrid parents is the only way to improve the application of heterosis. The early development of hybrid corn changed from hybridization to inbred line hybridization, greatly increased the yield of hybrids, while the continuous improvement of inbred lines Benefiting from the use and promotion of parental combining ability and heterosis group theory, the output of hybrid corn has been continuously increased in recent decades and still maintained a good momentum of development. In the quantitative genetics theory of crop heterosis utilization, the theory of combining ability plays the role of linking up and down, which is the sum-up of decades of experience in breeding of hybrid corn and the foundation of later heterosis group theory. The establishment of the theory of combining ability and Development of breeding parents and hybrids