The American Midwest is known as the corn belt-- that is where most of the nation's corn is grown. 美国中西部以玉米带闻名于世，那里是美国大部分玉米的产地。
Objectives of our study were to introgress elite subtropical and tropical germplasm with elite U.S.Corn Belt germplasm. 我们的研究目标是将优良的热带和亚热带种质通过渐渗杂交的方式导入美国玉米带种质。
