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种质资源遗传基础狭窄是目前我国玉米育种取得突破性进展的主要限制因素。温带玉米与热带亚热带玉米种质的杂交和渗进，可能是今后获得更多有利用价值遗传变异的一个重要途径。因此，热带亚热带玉米种质的研究和利用受到了国内外育种工作者的普遍重视。１９９６年我们从墨西哥?
The narrow genetic basis of germplasm resources is the main limiting factor for the breakthrough in maize breeding in China. Hybridization and infiltration of temperate maize and tropical subtropical maize germplasm may be one of the most important ways to gain more valuable genetic variations in the future. Therefore, the research and utilization of tropical and subtropical maize germplasm has been generally valued by domestic and foreign breeding workers. We are from Mexico in 1996?