结合四川地区生态环境，选育生育期适中、抗病、抗倒、品质优、高产和适应性广的玉米杂交种。根据基因重组的原理，以优良玉米地方种质作为选系的主要基础材料，结合籽粒品质、综合抗性定向选择及配合力分析，加速选育优良自交系。成功选育出抗逆性强、抗病、配合力高和自身产量高的自交系宜2397，与外引系0151 组配育成了玉米新品种‘显玉509’。试验结果表明：该品种具有高产、稳产、优质、抗逆性强、适应性广的特点，适宜在四川省海拔200~800 m的平坝、丘陵地区推广种植。利用优异地方种质和表现型好的杂交种进行杂交重组选育的自交系具有较强的适应性和高配合力，组配的杂交种产量高，品质好，具有广阔的推广应用前景。

According to the ecological environment of Sichuan Area, the experiment was conducted to develop the corn hybrid with characteristics of moderate growth period, disease-resistant, quality, high yield and wide adaptability. Based on the principle of gene recombination, the local germplasm was used as primary base population. Meanwhile, quality, comprehensive resistance directional selection and combining ability analysis on advanced generations were adopted to accelerate the selective breeding speed of inbred-line. Inbred-line ‘Yi 2397’was successfully bred, which had the characteristics of strong resistance, disease-resistant, high combining ability and high yield.‘Xian-Yu 509’was bred which was combined inbred-line‘Yi 2397’and inbred-line 0151. The study indicated that the maize hybrid had plenty of merits, including high stable yield, quality, excellent resistance and the wider adaptation. It was adaptable for planting in plain and hilly areas at an elevation of 200-800 m Pingba of Sichuan Province. With hybrid recombination between local germplasm and good phenotype hybrid, inbred-line had the characteristics of strong adaptability, high general combining ability, and the cross combinations had high yield, and quality. And it had broad prospects processing utilization.