...When plant breeders created modern wheat during the 19th and 20th centuries, they focused on crossing and selectively breeding a few key varieties, creating a finicky racehorse of a crop: high yielding but vulnerable to disease, heat, and drought and reliant on a liberal application of fertilizer. Part of the solution, according to a study published today by Nature, may lie in the genetic diversity in 827 kinds of wheat, many of them long vanished from farms...Already scientists have identified genes that, if bred into modern wheat, could reduce the crop's need for nitrogen fertilizer and increase its resistance to...