在现代玉米育种过程中需要进行杂交、自交和回交。由于育种的目标不同,所采取的杂交、自交的具体方法和步骤也有不同。但它们的共同特点,都是必须先通过连续多代的自交来选育优良的基因纯合的亲本自交系,然后再采用不同的自交系进行杂交,利用F1代的杂种优势。2010年,我单位开始在海南对同一材料进行两个世代选育,进一步加快自交系选育进程。通过对同一份材料,一年内南北方加代三个世代,并通过快速自 Breeding needs to be done in modern corn breeding, selfing and backcrossing. Due to the different goals of breeding, the specific methods and steps of hybridization and self-cultivation are also different. However, their common feature is that all the inbred lines must be bred with the excellent genetic homozygous inbred lines by continuous generations of inbred lines, and then crossed with different inbred lines to make use of F1 heterosis. In 2010, our unit began to conduct two generations of breeding on the same material in Hainan to further accelerate the breeding process of inbred lines. Through the same material, within one year, north and south plus three generations, and through rapid self